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Semester 1/Programming 1/Java/Chapter01/Figures/Canvas$1.class Normal file
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Semester 1/Programming 1/Java/Chapter01/Figures/Canvas.ctxt Normal file
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#BlueJ class context
comment0.target=Canvas\ getCanvas()
comment0.text=\nFactory\ method\ to\ get\ the\ canvas\ singleton\ object.\n\n
comment1.params=title\ width\ height\ bgColour
comment1.target=Canvas(String,\ int,\ int,\ Color)
comment1.text=\nCreate\ a\ Canvas.\n@param\ title\ \ title\ to\ appear\ in\ Canvas\ Frame\n@param\ width\ \ the\ desired\ width\ for\ the\ canvas\n@param\ height\ \ the\ desired\ height\ for\ the\ canvas\n@param\ bgClour\ \ the\ desired\ background\ colour\ of\ the\ canvas\n\n
comment2.params=visible
comment2.target=void\ setVisible(boolean)
comment2.text=\nSet\ the\ canvas\ visibility\ and\ brings\ canvas\ to\ the\ front\ of\ screen\nwhen\ made\ visible.\ This\ method\ can\ also\ be\ used\ to\ bring\ an\ already\nvisible\ canvas\ to\ the\ front\ of\ other\ windows.\n@param\ visible\ \ boolean\ value\ representing\ the\ desired\ visibility\ of\nthe\ canvas\ (true\ or\ false)\ \n\n
comment3.params=referenceObject\ color\ shape
comment3.target=void\ draw(Object,\ String,\ Shape)
comment3.text=\nDraw\ a\ given\ shape\ onto\ the\ canvas.\n@param\ \ referenceObject\ \ an\ object\ to\ define\ identity\ for\ this\ shape\n@param\ \ color\ \ \ \ \ \ \ \ \ \ \ \ the\ color\ of\ the\ shape\n@param\ \ shape\ \ \ \ \ \ \ \ \ \ \ \ the\ shape\ object\ to\ be\ drawn\ on\ the\ canvas\n\n
comment4.params=referenceObject
comment4.target=void\ erase(Object)
comment4.text=\nErase\ a\ given\ shape's\ from\ the\ screen.\n@param\ \ referenceObject\ \ the\ shape\ object\ to\ be\ erased\ \n\n
comment5.params=colorString
comment5.target=void\ setForegroundColor(String)
comment5.text=\nSet\ the\ foreground\ colour\ of\ the\ Canvas.\n@param\ \ newColour\ \ \ the\ new\ colour\ for\ the\ foreground\ of\ the\ Canvas\ \n\n
comment6.params=milliseconds
comment6.target=void\ wait(int)
comment6.text=\nWait\ for\ a\ specified\ number\ of\ milliseconds\ before\ finishing.\nThis\ provides\ an\ easy\ way\ to\ specify\ a\ small\ delay\ which\ can\ be\nused\ when\ producing\ animations.\n@param\ \ milliseconds\ \ the\ number\ \n\n
comment7.target=void\ redraw()
comment7.text=\nRedraw\ ell\ shapes\ currently\ on\ the\ Canvas.\n\n
comment8.target=void\ erase()
comment8.text=\nErase\ the\ whole\ canvas.\ (Does\ not\ repaint.)\n\n
numComments=9

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Semester 1/Programming 1/Java/Chapter01/Figures/Canvas.java Normal file
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import javax.swing.*;
import java.awt.*;
import java.util.List;
import java.util.*;
/**
* Canvas is a class to allow for simple graphical drawing on a canvas.
* This is a modification of the general purpose Canvas, specially made for
* the BlueJ "shapes" example.
*
* @author: Bruce Quig
* @author: Michael Kolling (mik)
*
* @version: 1.6 (shapes)
*/
public class Canvas
{
// Note: The implementation of this class (specifically the handling of
// shape identity and colors) is slightly more complex than necessary. This
// is done on purpose to keep the interface and instance fields of the
// shape objects in this project clean and simple for educational purposes.
private static Canvas canvasSingleton;
/**
* Factory method to get the canvas singleton object.
*/
public static Canvas getCanvas()
{
if(canvasSingleton == null) {
canvasSingleton = new Canvas("BlueJ Shapes Demo", 300, 300,
Color.white);
}
canvasSingleton.setVisible(true);
return canvasSingleton;
}
// ----- instance part -----
private JFrame frame;
private CanvasPane canvas;
private Graphics2D graphic;
private Color backgroundColour;
private Image canvasImage;
private List objects;
private HashMap shapes;
/**
* Create a Canvas.
* @param title title to appear in Canvas Frame
* @param width the desired width for the canvas
* @param height the desired height for the canvas
* @param bgClour the desired background colour of the canvas
*/
private Canvas(String title, int width, int height, Color bgColour)
{
frame = new JFrame();
canvas = new CanvasPane();
frame.setContentPane(canvas);
frame.setTitle(title);
canvas.setPreferredSize(new Dimension(width, height));
backgroundColour = bgColour;
frame.pack();
objects = new ArrayList();
shapes = new HashMap();
}
/**
* Set the canvas visibility and brings canvas to the front of screen
* when made visible. This method can also be used to bring an already
* visible canvas to the front of other windows.
* @param visible boolean value representing the desired visibility of
* the canvas (true or false)
*/
public void setVisible(boolean visible)
{
if(graphic == null) {
// first time: instantiate the offscreen image and fill it with
// the background colour
Dimension size = canvas.getSize();
canvasImage = canvas.createImage(size.width, size.height);
graphic = (Graphics2D)canvasImage.getGraphics();
graphic.setColor(backgroundColour);
graphic.fillRect(0, 0, size.width, size.height);
graphic.setColor(Color.black);
}
frame.setVisible(visible);
}
/**
* Draw a given shape onto the canvas.
* @param referenceObject an object to define identity for this shape
* @param color the color of the shape
* @param shape the shape object to be drawn on the canvas
*/
// Note: this is a slightly backwards way of maintaining the shape
// objects. It is carefully designed to keep the visible shape interfaces
// in this project clean and simple for educational purposes.
public void draw(Object referenceObject, String color, Shape shape)
{
objects.remove(referenceObject); // just in case it was already there
objects.add(referenceObject); // add at the end
shapes.put(referenceObject, new ShapeDescription(shape, color));
redraw();
}
/**
* Erase a given shape's from the screen.
* @param referenceObject the shape object to be erased
*/
public void erase(Object referenceObject)
{
objects.remove(referenceObject); // just in case it was already there
shapes.remove(referenceObject);
redraw();
}
/**
* Set the foreground colour of the Canvas.
* @param newColour the new colour for the foreground of the Canvas
*/
public void setForegroundColor(String colorString)
{
if(colorString.equals("red"))
graphic.setColor(Color.red);
else if(colorString.equals("black"))
graphic.setColor(Color.black);
else if(colorString.equals("blue"))
graphic.setColor(Color.blue);
else if(colorString.equals("yellow"))
graphic.setColor(Color.yellow);
else if(colorString.equals("green"))
graphic.setColor(Color.green);
else if(colorString.equals("magenta"))
graphic.setColor(Color.magenta);
else if(colorString.equals("white"))
graphic.setColor(Color.white);
else
graphic.setColor(Color.black);
}
/**
* Wait for a specified number of milliseconds before finishing.
* This provides an easy way to specify a small delay which can be
* used when producing animations.
* @param milliseconds the number
*/
public void wait(int milliseconds)
{
try
{
Thread.sleep(milliseconds);
}
catch (Exception e)
{
// ignoring exception at the moment
}
}
/**
* Redraw ell shapes currently on the Canvas.
*/
private void redraw()
{
erase();
for(Iterator i=objects.iterator(); i.hasNext(); ) {
((ShapeDescription)shapes.get(i.next())).draw(graphic);
}
canvas.repaint();
}
/**
* Erase the whole canvas. (Does not repaint.)
*/
private void erase()
{
Color original = graphic.getColor();
graphic.setColor(backgroundColour);
Dimension size = canvas.getSize();
graphic.fill(new Rectangle(0, 0, size.width, size.height));
graphic.setColor(original);
}
/************************************************************************
* Inner class CanvasPane - the actual canvas component contained in the
* Canvas frame. This is essentially a JPanel with added capability to
* refresh the image drawn on it.
*/
private class CanvasPane extends JPanel
{
public void paint(Graphics g)
{
g.drawImage(canvasImage, 0, 0, null);
}
}
/************************************************************************
* Inner class CanvasPane - the actual canvas component contained in the
* Canvas frame. This is essentially a JPanel with added capability to
* refresh the image drawn on it.
*/
private class ShapeDescription
{
private Shape shape;
private String colorString;
public ShapeDescription(Shape shape, String color)
{
this.shape = shape;
colorString = color;
}
public void draw(Graphics2D graphic)
{
setForegroundColor(colorString);
graphic.fill(shape);
}
}
}

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Semester 1/Programming 1/Java/Chapter01/Figures/Circle.ctxt Normal file
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#BlueJ class context
comment0.params=
comment0.target=Circle()
comment0.text=\n\ Create\ a\ new\ circle\ at\ default\ position\ with\ default\ color.\n
comment1.params=x\ y
comment1.target=Circle(int,\ int)
comment10.params=distance
comment10.target=void\ moveHorizontal(int)
comment10.text=\n\ Move\ the\ circle\ horizontally\ by\ 'distance'\ pixels.\n
comment11.params=distance
comment11.target=void\ moveVertical(int)
comment11.text=\n\ Move\ the\ circle\ vertically\ by\ 'distance'\ pixels.\n
comment12.params=distance
comment12.target=void\ slowMoveHorizontal(int)
comment12.text=\n\ Slowly\ move\ the\ circle\ horizontally\ by\ 'distance'\ pixels.\n
comment13.params=distance
comment13.target=void\ slowMoveVertical(int)
comment13.text=\n\ Slowly\ move\ the\ circle\ vertically\ by\ 'distance'\ pixels.\n
comment14.params=newDiameter
comment14.target=void\ changeSize(int)
comment14.text=\n\ Change\ the\ size\ to\ the\ new\ size\ (in\ pixels).\ Size\ must\ be\ >\=\ 0.\n
comment15.params=newColor
comment15.target=void\ changeColor(java.lang.String)
comment15.text=\n\ Change\ the\ color.\ Valid\ colors\ are\ "red",\ "yellow",\ "blue",\ "green",\n\ "magenta"\ and\ "black".\n
comment16.params=
comment16.target=void\ draw()
comment16.text=\n\ Draw\ the\ circle\ with\ current\ specifications\ on\ screen.\n
comment17.params=
comment17.target=void\ erase()
comment17.text=\n\ Erase\ the\ circle\ on\ screen.\n
comment2.params=x\ y\ col
comment2.target=Circle(int,\ int,\ java.lang.String)
comment3.params=x\ y\ col\ d
comment3.target=Circle(int,\ int,\ java.lang.String,\ int)
comment4.params=
comment4.target=void\ makeVisible()
comment4.text=\n\ Make\ this\ circle\ visible.\ If\ it\ was\ already\ visible,\ do\ nothing.\n
comment5.params=
comment5.target=void\ makeInvisible()
comment5.text=\n\ Make\ this\ circle\ invisible.\ If\ it\ was\ already\ invisible,\ do\ nothing.\n
comment6.params=
comment6.target=void\ moveRight()
comment6.text=\n\ Move\ the\ circle\ a\ few\ pixels\ to\ the\ right.\n
comment7.params=
comment7.target=void\ moveLeft()
comment7.text=\n\ Move\ the\ circle\ a\ few\ pixels\ to\ the\ left.\n
comment8.params=
comment8.target=void\ moveUp()
comment8.text=\n\ Move\ the\ circle\ a\ few\ pixels\ up.\n
comment9.params=
comment9.target=void\ moveDown()
comment9.text=\n\ Move\ the\ circle\ a\ few\ pixels\ down.\n
numComments=18

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Semester 1/Programming 1/Java/Chapter01/Figures/Circle.java Normal file
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import java.awt.*;
import java.awt.geom.*;
/**
* A circle that can be manipulated and that draws itself on a canvas.
*
* @author Michael Kolling and David J. Barnes
* @version 1.0 (15 July 2000)
*/
public class Circle
{
private int diameter;
private int xPosition;
private int yPosition;
private String color;
private boolean isVisible;
/**
* Create a new circle at default position with default color.
*/
public Circle()
{
diameter = 30;
xPosition = 20;
yPosition = 60;
color = "blue";
isVisible = false;
}
public Circle(int x, int y){
diameter = 30;
xPosition = x;
yPosition = y;
color = "blue";
}
public Circle(int x, int y, String col){
this(x,y,col,20);
}
public Circle(int x, int y, String col, int d){
diameter = d;
xPosition = x;
yPosition = y;
color = "blue";
makeVisible();
}
/**
* Make this circle visible. If it was already visible, do nothing.
*/
public void makeVisible()
{
isVisible = true;
draw();
}
/**
* Make this circle invisible. If it was already invisible, do nothing.
*/
public void makeInvisible()
{
erase();
isVisible = false;
}
/**
* Move the circle a few pixels to the right.
*/
public void moveRight()
{
moveHorizontal(20);
}
/**
* Move the circle a few pixels to the left.
*/
public void moveLeft()
{
moveHorizontal(-20);
}
/**
* Move the circle a few pixels up.
*/
public void moveUp()
{
moveVertical(-20);
}
/**
* Move the circle a few pixels down.
*/
public void moveDown()
{
moveVertical(20);
}
/**
* Move the circle horizontally by 'distance' pixels.
*/
public void moveHorizontal(int distance)
{
erase();
xPosition += distance;
draw();
}
/**
* Move the circle vertically by 'distance' pixels.
*/
public void moveVertical(int distance)
{
erase();
yPosition += distance;
draw();
}
/**
* Slowly move the circle horizontally by 'distance' pixels.
*/
public void slowMoveHorizontal(int distance)
{
int delta;
if(distance < 0)
{
delta = -1;
distance = -distance;
}
else
{
delta = 1;
}
for(int i = 0; i < distance; i++)
{
xPosition += delta;
draw();
}
}
/**
* Slowly move the circle vertically by 'distance' pixels.
*/
public void slowMoveVertical(int distance)
{
int delta;
if(distance < 0)
{
delta = -1;
distance = -distance;
}
else
{
delta = 1;
}
for(int i = 0; i < distance; i++)
{
yPosition += delta;
draw();
}
}
/**
* Change the size to the new size (in pixels). Size must be >= 0.
*/
public void changeSize(int newDiameter)
{
erase();
diameter = newDiameter;
draw();
}
/**
* Change the color. Valid colors are "red", "yellow", "blue", "green",
* "magenta" and "black".
*/
public void changeColor(String newColor)
{
color = newColor;
draw();
}
/*
* Draw the circle with current specifications on screen.
*/
private void draw()
{
if(isVisible) {
Canvas canvas = Canvas.getCanvas();
canvas.draw(this, color, new Ellipse2D.Double(xPosition, yPosition,
diameter, diameter));
canvas.wait(10);
}
}
/*
* Erase the circle on screen.
*/
private void erase()
{
if(isVisible) {
Canvas canvas = Canvas.getCanvas();
canvas.erase(this);
}
}
}

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Semester 1/Programming 1/Java/Chapter01/Figures/README.TXT Normal file
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Project "shapes"
Authors: Michael Kolling and David J. Barnes
This project is part of the material for the book
Objects First with Java - A Practical Introduction using BlueJ
David J. Barnes and Michael Kolling
Pearson Education, 2002
It is discussed in chapter 1.
This is a very simple project to demonstrate some characteristics of
objects.
You can create various shapes, and you will see, if you do, that those
shapes are drawn on screen (in a window that we call the "canvas").
You can then manipulate these objects: change their position, size and
colour. Try it out: create a few different squares, triangles and circles.
This project is designed as a first example of object-oriented programming.
It illustrates a number of concepts:
- a Java project (application) is a collection of classes
- objects can be created from classes
- from any one class, many objects may be created
- objects have operations (methods)
- operations can have parameters
- parameters have types (at least String and int)
- objects hold data (fields)
- the operations and fields are common to all objects
- the values stored in the fields can be different for each object
The project also demonstrates
- BlueJ object creation
- interactive method invocation
- parameter passing
A good second project to look at after this is "picture", which adds a class
to those ones in this project. That class (named "Picture") uses the shapes
to draw a picture. It can be used to experiment with coding.
Michael Kolling, July 2000

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#BlueJ class context
comment0.params=
comment0.target=Square()
comment0.text=\n\ Create\ a\ new\ square\ at\ default\ position\ with\ default\ color.\n
comment1.params=
comment1.target=void\ makeVisible()
comment1.text=\n\ Make\ this\ square\ visible.\ If\ it\ was\ already\ visible,\ do\ nothing.\n
comment10.params=distance
comment10.target=void\ slowMoveVertical(int)
comment10.text=\n\ Slowly\ move\ the\ square\ vertically\ by\ 'distance'\ pixels.\n
comment11.params=newSize
comment11.target=void\ changeSize(int)
comment11.text=\n\ Change\ the\ size\ to\ the\ new\ size\ (in\ pixels).\ Size\ must\ be\ >\=\ 0.\n
comment12.params=newColor
comment12.target=void\ changeColor(java.lang.String)
comment12.text=\n\ Change\ the\ color.\ Valid\ colors\ are\ "red",\ "yellow",\ "blue",\ "green",\n\ "magenta"\ and\ "black".\n
comment13.params=
comment13.target=void\ draw()
comment13.text=\n\ Draw\ the\ square\ with\ current\ specifications\ on\ screen.\n
comment14.params=
comment14.target=void\ erase()
comment14.text=\n\ Erase\ the\ square\ on\ screen.\n
comment2.params=
comment2.target=void\ makeInvisible()
comment2.text=\n\ Make\ this\ square\ invisible.\ If\ it\ was\ already\ invisible,\ do\ nothing.\n
comment3.params=
comment3.target=void\ moveRight()
comment3.text=\n\ Move\ the\ square\ a\ few\ pixels\ to\ the\ right.\n
comment4.params=
comment4.target=void\ moveLeft()
comment4.text=\n\ Move\ the\ square\ a\ few\ pixels\ to\ the\ left.\n
comment5.params=
comment5.target=void\ moveUp()
comment5.text=\n\ Move\ the\ square\ a\ few\ pixels\ up.\n
comment6.params=
comment6.target=void\ moveDown()
comment6.text=\n\ Move\ the\ square\ a\ few\ pixels\ down.\n
comment7.params=distance
comment7.target=void\ moveHorizontal(int)
comment7.text=\n\ Move\ the\ square\ horizontally\ by\ 'distance'\ pixels.\n
comment8.params=distance
comment8.target=void\ moveVertical(int)
comment8.text=\n\ Move\ the\ square\ vertically\ by\ 'distance'\ pixels.\n
comment9.params=distance
comment9.target=void\ slowMoveHorizontal(int)
comment9.text=\n\ Slowly\ move\ the\ square\ horizontally\ by\ 'distance'\ pixels.\n
numComments=15

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Semester 1/Programming 1/Java/Chapter01/Figures/Square.java Normal file
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import java.awt.*;
/**
* A square that can be manipulated and that draws itself on a canvas.
*
* @author Michael Kolling and David J. Barnes
* @version 1.0 (15 July 2000)
*/
public class Square
{
private int size;
private int xPosition;
private int yPosition;
private String color;
private boolean isVisible;
/**
* Create a new square at default position with default color.
*/
public Square()
{
size = 30;
xPosition = 60;
yPosition = 50;
color = "red";
isVisible = false;
}
/**
* Make this square visible. If it was already visible, do nothing.
*/
public void makeVisible()
{
isVisible = true;
draw();
}
/**
* Make this square invisible. If it was already invisible, do nothing.
*/
public void makeInvisible()
{
erase();
isVisible = false;
}
/**
* Move the square a few pixels to the right.
*/
public void moveRight()
{
moveHorizontal(20);
}
/**
* Move the square a few pixels to the left.
*/
public void moveLeft()
{
moveHorizontal(-20);
}
/**
* Move the square a few pixels up.
*/
public void moveUp()
{
moveVertical(-20);
}
/**
* Move the square a few pixels down.
*/
public void moveDown()
{
moveVertical(20);
}
/**
* Move the square horizontally by 'distance' pixels.
*/
public void moveHorizontal(int distance)
{
erase();
xPosition += distance;
draw();
}
/**
* Move the square vertically by 'distance' pixels.
*/
public void moveVertical(int distance)
{
erase();
yPosition += distance;
draw();
}
/**
* Slowly move the square horizontally by 'distance' pixels.
*/
public void slowMoveHorizontal(int distance)
{
int delta;
if(distance < 0)
{
delta = -1;
distance = -distance;
}
else
{
delta = 1;
}
for(int i = 0; i < distance; i++)
{
xPosition += delta;
draw();
}
}
/**
* Slowly move the square vertically by 'distance' pixels.
*/
public void slowMoveVertical(int distance)
{
int delta;
if(distance < 0)
{
delta = -1;
distance = -distance;
}
else
{
delta = 1;
}
for(int i = 0; i < distance; i++)
{
yPosition += delta;
draw();
}
}
/**
* Change the size to the new size (in pixels). Size must be >= 0.
*/
public void changeSize(int newSize)
{
erase();
size = newSize;
draw();
}
/**
* Change the color. Valid colors are "red", "yellow", "blue", "green",
* "magenta" and "black".
*/
public void changeColor(String newColor)
{
color = newColor;
draw();
}
/*
* Draw the square with current specifications on screen.
*/
private void draw()
{
if(isVisible) {
Canvas canvas = Canvas.getCanvas();
canvas.draw(this, color,
new Rectangle(xPosition, yPosition, size, size));
canvas.wait(10);
}
}
/*
* Erase the square on screen.
*/
private void erase()
{
if(isVisible) {
Canvas canvas = Canvas.getCanvas();
canvas.erase(this);
}
}
}

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#BlueJ class context
comment0.target=Triangle()
comment0.text=\nCreate\ a\ new\ triangle\ at\ default\ position\ with\ default\ color.\n\n
comment1.target=void\ makeVisible()
comment1.text=\nMake\ this\ triangle\ visible.\ If\ it\ was\ already\ visible,\ do\ nothing.\n\n
comment10.params=distance
comment10.target=void\ slowMoveVertical(int)
comment10.text=\nSlowly\ move\ the\ triangle\ vertically\ by\ 'distance'\ pixels.\n\n
comment11.params=newHeight\ newWidth
comment11.target=void\ changeSize(int,\ int)
comment11.text=\nChange\ the\ size\ to\ the\ new\ size\ (in\ pixels).\ Size\ must\ be\ >\=\ 0.\n\n
comment12.params=newColor
comment12.target=void\ changeColor(String)
comment12.text=\nChange\ the\ color.\ Valid\ colors\ are\ "red",\ "yellow",\ "blue",\ "green",\n"magenta"\ and\ "black".\n\n
comment13.target=void\ draw()
comment13.text=Draw\ the\ triangle\ with\ current\ specifications\ on\ screen.\n\n
comment14.target=void\ erase()
comment14.text=Erase\ the\ triangle\ on\ screen.\n\n
comment2.target=void\ makeInvisible()
comment2.text=\nMake\ this\ triangle\ invisible.\ If\ it\ was\ already\ invisible,\ do\ nothing.\n\n
comment3.target=void\ moveRight()
comment3.text=\nMove\ the\ triangle\ a\ few\ pixels\ to\ the\ right.\n\n
comment4.target=void\ moveLeft()
comment4.text=\nMove\ the\ triangle\ a\ few\ pixels\ to\ the\ left.\n\n
comment5.target=void\ moveUp()
comment5.text=\nMove\ the\ triangle\ a\ few\ pixels\ up.\n\n
comment6.target=void\ moveDown()
comment6.text=\nMove\ the\ triangle\ a\ few\ pixels\ down.\n\n
comment7.params=distance
comment7.target=void\ moveHorizontal(int)
comment7.text=\nMove\ the\ triangle\ horizontally\ by\ 'distance'\ pixels.\n\n
comment8.params=distance
comment8.target=void\ moveVertical(int)
comment8.text=\nMove\ the\ triangle\ vertically\ by\ 'distance'\ pixels.\n\n
comment9.params=distance
comment9.target=void\ slowMoveHorizontal(int)
comment9.text=\nSlowly\ move\ the\ triangle\ horizontally\ by\ 'distance'\ pixels.\n\n
numComments=15

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import java.awt.*;
/**
* A triangle that can be manipulated and that draws itself on a canvas.
*
* @author Michael Kolling and David J. Barnes
* @version 1.0 (15 July 2000)
*/
public class Triangle
{
private int height;
private int width;
private int xPosition;
private int yPosition;
private String color;
private boolean isVisible;
/**
* Create a new triangle at default position with default color.
*/
public Triangle()
{
height = 30;
width = 40;
xPosition = 50;
yPosition = 15;
color = "green";
isVisible = false;
}
/**
* Make this triangle visible. If it was already visible, do nothing.
*/
public void makeVisible()
{
isVisible = true;
draw();
}
/**
* Make this triangle invisible. If it was already invisible, do nothing.
*/
public void makeInvisible()
{
erase();
isVisible = false;
}
/**
* Move the triangle a few pixels to the right.
*/
public void moveRight()
{
moveHorizontal(20);
}
/**
* Move the triangle a few pixels to the left.
*/
public void moveLeft()
{
moveHorizontal(-20);
}
/**
* Move the triangle a few pixels up.
*/
public void moveUp()
{
moveVertical(-20);
}
/**
* Move the triangle a few pixels down.
*/
public void moveDown()
{
moveVertical(20);
}
/**
* Move the triangle horizontally by 'distance' pixels.
*/
public void moveHorizontal(int distance)
{
erase();
xPosition += distance;
draw();
}
/**
* Move the triangle vertically by 'distance' pixels.
*/
public void moveVertical(int distance)
{
erase();
yPosition += distance;
draw();
}
/**
* Slowly move the triangle horizontally by 'distance' pixels.
*/
public void slowMoveHorizontal(int distance)
{
int delta;
if(distance < 0)
{
delta = -1;
distance = -distance;
}
else
{
delta = 1;
}
for(int i = 0; i < distance; i++)
{
xPosition += delta;
draw();
}
}
/**
* Slowly move the triangle vertically by 'distance' pixels.
*/
public void slowMoveVertical(int distance)
{
int delta;
if(distance < 0)
{
delta = -1;
distance = -distance;
}
else
{
delta = 1;
}
for(int i = 0; i < distance; i++)
{
yPosition += delta;
draw();
}
}
/**
* Change the size to the new size (in pixels). Size must be >= 0.
*/
public void changeSize(int newHeight, int newWidth)
{
erase();
height = newHeight;
width = newWidth;
draw();
}
/**
* Change the color. Valid colors are "red", "yellow", "blue", "green",
* "magenta" and "black".
*/
public void changeColor(String newColor)
{
color = newColor;
draw();
}
/*
* Draw the triangle with current specifications on screen.
*/
private void draw()
{
if(isVisible) {
Canvas canvas = Canvas.getCanvas();
int[] xpoints = { xPosition, xPosition + (width/2), xPosition - (width/2) };
int[] ypoints = { yPosition, yPosition + height, yPosition + height };
canvas.draw(this, color, new Polygon(xpoints, ypoints, 3));
canvas.wait(10);
}
}
/*
* Erase the triangle on screen.
*/
private void erase()
{
if(isVisible) {
Canvas canvas = Canvas.getCanvas();
canvas.erase(this);
}
}
}

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#BlueJ package file
dependency1.from=Triangle
dependency1.to=Canvas
dependency1.type=UsesDependency
dependency2.from=Square
dependency2.to=Canvas
dependency2.type=UsesDependency
dependency3.from=Circle
dependency3.to=Canvas
dependency3.type=UsesDependency
objectbench.height=76
objectbench.width=940
package.editor.height=874
package.editor.width=814
package.editor.x=0
package.editor.y=31
package.numDependencies=3
package.numTargets=4
package.showExtends=true
package.showUses=true
project.charset=UTF-8
target1.editor.height=867
target1.editor.width=1100
target1.editor.x=0
target1.editor.y=31
target1.height=40
target1.name=Circle
target1.naviview.expanded=true
target1.showInterface=false
target1.type=ClassTarget
target1.typeParameters=
target1.width=70
target1.x=100
target1.y=120
target2.editor.height=521
target2.editor.width=626
target2.editor.x=0
target2.editor.y=0
target2.height=40
target2.name=Canvas
target2.showInterface=false
target2.type=ClassTarget
target2.typeParameters=
target2.width=70
target2.x=20
target2.y=180
target3.height=40
target3.name=Triangle
target3.showInterface=false
target3.type=ClassTarget
target3.typeParameters=
target3.width=70
target3.x=260
target3.y=60
target4.height=40
target4.name=Square
target4.showInterface=false
target4.type=ClassTarget
target4.typeParameters=
target4.width=70
target4.x=180
target4.y=90

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#BlueJ package file
dependency1.from=Triangle
dependency1.to=Canvas
dependency1.type=UsesDependency
dependency2.from=Square
dependency2.to=Canvas
dependency2.type=UsesDependency
dependency3.from=Circle
dependency3.to=Canvas
dependency3.type=UsesDependency
objectbench.height=76
objectbench.width=940
package.editor.height=874
package.editor.width=814
package.editor.x=0
package.editor.y=31
package.numDependencies=3
package.numTargets=4
package.showExtends=true
package.showUses=true
project.charset=UTF-8
target1.editor.height=867
target1.editor.width=1100
target1.editor.x=0
target1.editor.y=31
target1.height=40
target1.name=Circle
target1.naviview.expanded=true
target1.showInterface=false
target1.type=ClassTarget
target1.typeParameters=
target1.width=70
target1.x=100
target1.y=120
target2.editor.height=521
target2.editor.width=626
target2.editor.x=0
target2.editor.y=0
target2.height=40
target2.name=Canvas
target2.showInterface=false
target2.type=ClassTarget
target2.typeParameters=
target2.width=70
target2.x=20
target2.y=180
target3.height=40
target3.name=Triangle
target3.showInterface=false
target3.type=ClassTarget
target3.typeParameters=
target3.width=70
target3.x=260
target3.y=60
target4.height=40
target4.name=Square
target4.showInterface=false
target4.type=ClassTarget
target4.typeParameters=
target4.width=70
target4.x=180
target4.y=90

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#BlueJ class context
comment0.params=
comment0.target=Canvas\ getCanvas()
comment0.text=\n\ Factory\ method\ to\ get\ the\ canvas\ singleton\ object.\n
comment1.params=title\ width\ height\ bgColor
comment1.target=Canvas(java.lang.String,\ int,\ int,\ java.awt.Color)
comment1.text=\n\ Create\ a\ Canvas.\n\ @param\ title\ \ \ \ title\ to\ appear\ in\ Canvas\ Frame\n\ @param\ width\ \ \ \ the\ desired\ width\ for\ the\ canvas\n\ @param\ height\ \ \ the\ desired\ height\ for\ the\ canvas\n\ @param\ bgColor\ the\ desired\ background\ color\ of\ the\ canvas\n
comment2.params=visible
comment2.target=void\ setVisible(boolean)
comment2.text=\n\ Set\ the\ canvas\ visibility\ and\ brings\ canvas\ to\ the\ front\ of\ screen\n\ when\ made\ visible.\ This\ method\ can\ also\ be\ used\ to\ bring\ an\ already\n\ visible\ canvas\ to\ the\ front\ of\ other\ windows.\n\ @param\ visible\ \ boolean\ value\ representing\ the\ desired\ visibility\ of\n\ the\ canvas\ (true\ or\ false)\ \n
comment3.params=referenceObject\ color\ shape
comment3.target=void\ draw(java.lang.Object,\ java.lang.String,\ java.awt.Shape)
comment3.text=\n\ Draw\ a\ given\ shape\ onto\ the\ canvas.\n\ @param\ \ referenceObject\ \ an\ object\ to\ define\ identity\ for\ this\ shape\n\ @param\ \ color\ \ \ \ \ \ \ \ \ \ \ \ the\ color\ of\ the\ shape\n\ @param\ \ shape\ \ \ \ \ \ \ \ \ \ \ \ the\ shape\ object\ to\ be\ drawn\ on\ the\ canvas\n
comment4.params=referenceObject
comment4.target=void\ erase(java.lang.Object)
comment4.text=\n\ Erase\ a\ given\ shape's\ from\ the\ screen.\n\ @param\ \ referenceObject\ \ the\ shape\ object\ to\ be\ erased\ \n
comment5.params=colorString
comment5.target=void\ setForegroundColor(java.lang.String)
comment5.text=\n\ Set\ the\ foreground\ color\ of\ the\ Canvas.\n\ @param\ \ newColor\ \ \ the\ new\ color\ for\ the\ foreground\ of\ the\ Canvas\ \n
comment6.params=milliseconds
comment6.target=void\ wait(int)
comment6.text=\n\ Wait\ for\ a\ specified\ number\ of\ milliseconds\ before\ finishing.\n\ This\ provides\ an\ easy\ way\ to\ specify\ a\ small\ delay\ which\ can\ be\n\ used\ when\ producing\ animations.\n\ @param\ \ milliseconds\ \ the\ number\ \n
comment7.params=
comment7.target=void\ redraw()
comment7.text=\n\ Redraw\ ell\ shapes\ currently\ on\ the\ Canvas.\n
comment8.params=
comment8.target=void\ erase()
comment8.text=\n\ Erase\ the\ whole\ canvas.\ (Does\ not\ repaint.)\n
numComments=9

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import javax.swing.*;
import java.awt.*;
import java.util.List;
import java.util.*;
/**
* Canvas is a class to allow for simple graphical drawing on a canvas.
* This is a modification of the general purpose Canvas, specially made for
* the BlueJ "shapes" example.
*
* @author: Bruce Quig
* @author: Michael K<>lling (mik)
*
* @version 2016.02.29
*/
public class Canvas
{
// Note: The implementation of this class (specifically the handling of
// shape identity and colors) is slightly more complex than necessary. This
// is done on purpose to keep the interface and instance fields of the
// shape objects in this project clean and simple for educational purposes.
private static Canvas canvasSingleton;
/**
* Factory method to get the canvas singleton object.
*/
public static Canvas getCanvas()
{
if(canvasSingleton == null) {
canvasSingleton = new Canvas("BlueJ Picture Demo", 500, 300,
Color.white);
}
canvasSingleton.setVisible(true);
return canvasSingleton;
}
// ----- instance part -----
private JFrame frame;
private CanvasPane canvas;
private Graphics2D graphic;
private Color backgroundColor;
private Image canvasImage;
private List<Object> objects;
private HashMap<Object, ShapeDescription> shapes;
/**
* Create a Canvas.
* @param title title to appear in Canvas Frame
* @param width the desired width for the canvas
* @param height the desired height for the canvas
* @param bgColor the desired background color of the canvas
*/
private Canvas(String title, int width, int height, Color bgColor)
{
frame = new JFrame();
canvas = new CanvasPane();
frame.setContentPane(canvas);
frame.setTitle(title);
frame.setLocation(30, 30);
canvas.setPreferredSize(new Dimension(width, height));
backgroundColor = bgColor;
frame.pack();
objects = new ArrayList<Object>();
shapes = new HashMap<Object, ShapeDescription>();
}
/**
* Set the canvas visibility and brings canvas to the front of screen
* when made visible. This method can also be used to bring an already
* visible canvas to the front of other windows.
* @param visible boolean value representing the desired visibility of
* the canvas (true or false)
*/
public void setVisible(boolean visible)
{
if(graphic == null) {
// first time: instantiate the offscreen image and fill it with
// the background color
Dimension size = canvas.getSize();
canvasImage = canvas.createImage(size.width, size.height);
graphic = (Graphics2D)canvasImage.getGraphics();
graphic.setColor(backgroundColor);
graphic.fillRect(0, 0, size.width, size.height);
graphic.setColor(Color.black);
}
frame.setVisible(visible);
}
/**
* Draw a given shape onto the canvas.
* @param referenceObject an object to define identity for this shape
* @param color the color of the shape
* @param shape the shape object to be drawn on the canvas
*/
// Note: this is a slightly backwards way of maintaining the shape
// objects. It is carefully designed to keep the visible shape interfaces
// in this project clean and simple for educational purposes.
public void draw(Object referenceObject, String color, Shape shape)
{
objects.remove(referenceObject); // just in case it was already there
objects.add(referenceObject); // add at the end
shapes.put(referenceObject, new ShapeDescription(shape, color));
redraw();
}
/**
* Erase a given shape's from the screen.
* @param referenceObject the shape object to be erased
*/
public void erase(Object referenceObject)
{
objects.remove(referenceObject); // just in case it was already there
shapes.remove(referenceObject);
redraw();
}
/**
* Set the foreground color of the Canvas.
* @param newColor the new color for the foreground of the Canvas
*/
public void setForegroundColor(String colorString)
{
if(colorString.equals("red")) {
graphic.setColor(new Color(235, 25, 25));
}
else if(colorString.equals("black")) {
graphic.setColor(Color.black);
}
else if(colorString.equals("blue")) {
graphic.setColor(new Color(30, 75, 220));
}
else if(colorString.equals("yellow")) {
graphic.setColor(new Color(255, 230, 0));
}
else if(colorString.equals("green")) {
graphic.setColor(new Color(80, 160, 60));
}
else if(colorString.equals("magenta")) {
graphic.setColor(Color.magenta);
}
else if(colorString.equals("white")) {
graphic.setColor(Color.white);
}
else {
graphic.setColor(Color.black);
}
}
/**
* Wait for a specified number of milliseconds before finishing.
* This provides an easy way to specify a small delay which can be
* used when producing animations.
* @param milliseconds the number
*/
public void wait(int milliseconds)
{
try
{
Thread.sleep(milliseconds);
}
catch (Exception e)
{
// ignoring exception at the moment
}
}
/**
* Redraw ell shapes currently on the Canvas.
*/
private void redraw()
{
erase();
for(Object shape : objects) {
shapes.get(shape).draw(graphic);
}
canvas.repaint();
}
/**
* Erase the whole canvas. (Does not repaint.)
*/
private void erase()
{
Color original = graphic.getColor();
graphic.setColor(backgroundColor);
Dimension size = canvas.getSize();
graphic.fill(new Rectangle(0, 0, size.width, size.height));
graphic.setColor(original);
}
/************************************************************************
* Inner class CanvasPane - the actual canvas component contained in the
* Canvas frame. This is essentially a JPanel with added capability to
* refresh the image drawn on it.
*/
private class CanvasPane extends JPanel
{
public void paint(Graphics g)
{
g.drawImage(canvasImage, 0, 0, null);
}
}
/************************************************************************
* Inner class CanvasPane - the actual canvas component contained in the
* Canvas frame. This is essentially a JPanel with added capability to
* refresh the image drawn on it.
*/
private class ShapeDescription
{
private Shape shape;
private String colorString;
public ShapeDescription(Shape shape, String color)
{
this.shape = shape;
colorString = color;
}
public void draw(Graphics2D graphic)
{
setForegroundColor(colorString);
graphic.fill(shape);
}
}
}

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#BlueJ class context
comment0.params=
comment0.target=Circle()
comment0.text=\n\ Create\ a\ new\ circle\ at\ default\ position\ with\ default\ color.\n
comment1.params=
comment1.target=void\ makeVisible()
comment1.text=\n\ Make\ this\ circle\ visible.\ If\ it\ was\ already\ visible,\ do\ nothing.\n
comment10.params=distance
comment10.target=void\ slowMoveVertical(int)
comment10.text=\n\ Slowly\ move\ the\ circle\ vertically\ by\ 'distance'\ pixels.\n
comment11.params=newDiameter
comment11.target=void\ changeSize(int)
comment11.text=\n\ Change\ the\ size\ to\ the\ new\ size\ (in\ pixels).\ Size\ must\ be\ >\=\ 0.\n
comment12.params=newColor
comment12.target=void\ changeColor(java.lang.String)
comment12.text=\n\ Change\ the\ color.\ Valid\ colors\ are\ "red",\ "yellow",\ "blue",\ "green",\n\ "magenta"\ and\ "black".\n
comment13.params=
comment13.target=void\ draw()
comment13.text=\n\ Draw\ the\ circle\ with\ current\ specifications\ on\ screen.\n
comment14.params=
comment14.target=void\ erase()
comment14.text=\n\ Erase\ the\ circle\ on\ screen.\n
comment2.params=
comment2.target=void\ makeInvisible()
comment2.text=\n\ Make\ this\ circle\ invisible.\ If\ it\ was\ already\ invisible,\ do\ nothing.\n
comment3.params=
comment3.target=void\ moveRight()
comment3.text=\n\ Move\ the\ circle\ a\ few\ pixels\ to\ the\ right.\n
comment4.params=
comment4.target=void\ moveLeft()
comment4.text=\n\ Move\ the\ circle\ a\ few\ pixels\ to\ the\ left.\n
comment5.params=
comment5.target=void\ moveUp()
comment5.text=\n\ Move\ the\ circle\ a\ few\ pixels\ up.\n
comment6.params=
comment6.target=void\ moveDown()
comment6.text=\n\ Move\ the\ circle\ a\ few\ pixels\ down.\n
comment7.params=distance
comment7.target=void\ moveHorizontal(int)
comment7.text=\n\ Move\ the\ circle\ horizontally\ by\ 'distance'\ pixels.\n
comment8.params=distance
comment8.target=void\ moveVertical(int)
comment8.text=\n\ Move\ the\ circle\ vertically\ by\ 'distance'\ pixels.\n
comment9.params=distance
comment9.target=void\ slowMoveHorizontal(int)
comment9.text=\n\ Slowly\ move\ the\ circle\ horizontally\ by\ 'distance'\ pixels.\n
numComments=15

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Semester 1/Programming 1/Java/Chapter01/House with Two Suns/Circle.java Normal file
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import java.awt.*;
import java.awt.geom.*;
/**
* A circle that can be manipulated and that draws itself on a canvas.
*
* @author Michael K<>lling and David J. Barnes
* @version 2016.02.29
*/
public class Circle
{
private int diameter;
private int xPosition;
private int yPosition;
private String color;
private boolean isVisible;
/**
* Create a new circle at default position with default color.
*/
public Circle()
{
diameter = 68;
xPosition = 230;
yPosition = 90;
color = "blue";
}
/**
* Make this circle visible. If it was already visible, do nothing.
*/
public void makeVisible()
{
isVisible = true;
draw();
}
/**
* Make this circle invisible. If it was already invisible, do nothing.
*/
public void makeInvisible()
{
erase();
isVisible = false;
}
/**
* Move the circle a few pixels to the right.
*/
public void moveRight()
{
moveHorizontal(20);
}
/**
* Move the circle a few pixels to the left.
*/
public void moveLeft()
{
moveHorizontal(-20);
}
/**
* Move the circle a few pixels up.
*/
public void moveUp()
{
moveVertical(-20);
}
/**
* Move the circle a few pixels down.
*/
public void moveDown()
{
moveVertical(20);
}
/**
* Move the circle horizontally by 'distance' pixels.
*/
public void moveHorizontal(int distance)
{
erase();
xPosition += distance;
draw();
}
/**
* Move the circle vertically by 'distance' pixels.
*/
public void moveVertical(int distance)
{
erase();
yPosition += distance;
draw();
}
/**
* Slowly move the circle horizontally by 'distance' pixels.
*/
public void slowMoveHorizontal(int distance)
{
int delta;
if(distance < 0)
{
delta = -1;
distance = -distance;
}
else
{
delta = 1;
}
for(int i = 0; i < distance; i++)
{
xPosition += delta;
draw();
}
}
/**
* Slowly move the circle vertically by 'distance' pixels.
*/
public void slowMoveVertical(int distance)
{
int delta;
if(distance < 0)
{
delta = -1;
distance = -distance;
}
else
{
delta = 1;
}
for(int i = 0; i < distance; i++)
{
yPosition += delta;
draw();
}
}
/**
* Change the size to the new size (in pixels). Size must be >= 0.
*/
public void changeSize(int newDiameter)
{
erase();
diameter = newDiameter;
draw();
}
/**
* Change the color. Valid colors are "red", "yellow", "blue", "green",
* "magenta" and "black".
*/
public void changeColor(String newColor)
{
color = newColor;
draw();
}
/**
* Draw the circle with current specifications on screen.
*/
private void draw()
{
if(isVisible) {
Canvas canvas = Canvas.getCanvas();
canvas.draw(this, color, new Ellipse2D.Double(xPosition, yPosition,
diameter, diameter));
canvas.wait(10);
}
}
/**
* Erase the circle on screen.
*/
private void erase()
{
if(isVisible) {
Canvas canvas = Canvas.getCanvas();
canvas.erase(this);
}
}
}

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#BlueJ class context
comment0.params=
comment0.target=Person()
comment0.text=\n\ Create\ a\ new\ person\ at\ default\ position\ with\ default\ color.\n
comment1.params=
comment1.target=void\ makeVisible()
comment1.text=\n\ Make\ this\ person\ visible.\ If\ it\ was\ already\ visible,\ do\ nothing.\n
comment10.params=distance
comment10.target=void\ slowMoveVertical(int)
comment10.text=\n\ Slowly\ move\ the\ person\ vertically\ by\ 'distance'\ pixels.\n
comment11.params=newHeight\ newWidth
comment11.target=void\ changeSize(int,\ int)
comment11.text=\n\ Change\ the\ size\ to\ the\ new\ size\ (in\ pixels).\ Size\ must\ be\ >\=\ 0.\n
comment12.params=newColor
comment12.target=void\ changeColor(java.lang.String)
comment12.text=\n\ Change\ the\ color.\ Valid\ colors\ are\ "red",\ "yellow",\ "blue",\ "green",\n\ "magenta"\ and\ "black".\n
comment13.params=
comment13.target=void\ draw()
comment13.text=\n\ Draw\ the\ person\ with\ current\ specifications\ on\ screen.\n
comment14.params=
comment14.target=void\ erase()
comment14.text=\n\ Erase\ the\ person\ on\ screen.\n
comment2.params=
comment2.target=void\ makeInvisible()
comment2.text=\n\ Make\ this\ person\ invisible.\ If\ it\ was\ already\ invisible,\ do\ nothing.\n
comment3.params=
comment3.target=void\ moveRight()
comment3.text=\n\ Move\ the\ person\ a\ few\ pixels\ to\ the\ right.\n
comment4.params=
comment4.target=void\ moveLeft()
comment4.text=\n\ Move\ the\ person\ a\ few\ pixels\ to\ the\ left.\n
comment5.params=
comment5.target=void\ moveUp()
comment5.text=\n\ Move\ the\ person\ a\ few\ pixels\ up.\n
comment6.params=
comment6.target=void\ moveDown()
comment6.text=\n\ Move\ the\ person\ a\ few\ pixels\ down.\n
comment7.params=distance
comment7.target=void\ moveHorizontal(int)
comment7.text=\n\ Move\ the\ person\ horizontally\ by\ 'distance'\ pixels.\n
comment8.params=distance
comment8.target=void\ moveVertical(int)
comment8.text=\n\ Move\ the\ person\ vertically\ by\ 'distance'\ pixels.\n
comment9.params=distance
comment9.target=void\ slowMoveHorizontal(int)
comment9.text=\n\ Slowly\ move\ the\ person\ horizontally\ by\ 'distance'\ pixels.\n
numComments=15

206
Semester 1/Programming 1/Java/Chapter01/House with Two Suns/Person.java Normal file
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import java.awt.*;
/**
* A person that can be manipulated and that draws itself on a canvas.
*
* @author Michael K<>lling and David J. Barnes
* @version 2016.02.29
*/
public class Person
{
private int height;
private int width;
private int xPosition;
private int yPosition;
private String color;
private boolean isVisible;
/**
* Create a new person at default position with default color.
*/
public Person()
{
height = 60;
width = 30;
xPosition = 280;
yPosition = 190;
color = "black";
isVisible = false;
}
/**
* Make this person visible. If it was already visible, do nothing.
*/
public void makeVisible()
{
isVisible = true;
draw();
}
/**
* Make this person invisible. If it was already invisible, do nothing.
*/
public void makeInvisible()
{
erase();
isVisible = false;
}
/**
* Move the person a few pixels to the right.
*/
public void moveRight()
{
moveHorizontal(20);
}
/**
* Move the person a few pixels to the left.
*/
public void moveLeft()
{
moveHorizontal(-20);
}
/**
* Move the person a few pixels up.
*/
public void moveUp()
{
moveVertical(-20);
}
/**
* Move the person a few pixels down.
*/
public void moveDown()
{
moveVertical(20);
}
/**
* Move the person horizontally by 'distance' pixels.
*/
public void moveHorizontal(int distance)
{
erase();
xPosition += distance;
draw();
}
/**
* Move the person vertically by 'distance' pixels.
*/
public void moveVertical(int distance)
{
erase();
yPosition += distance;
draw();
}
/**
* Slowly move the person horizontally by 'distance' pixels.
*/
public void slowMoveHorizontal(int distance)
{
int delta;
if(distance < 0)
{
delta = -1;
distance = -distance;
}
else
{
delta = 1;
}
for(int i = 0; i < distance; i++)
{
xPosition += delta;
draw();
}
}
/**
* Slowly move the person vertically by 'distance' pixels.
*/
public void slowMoveVertical(int distance)
{
int delta;
if(distance < 0)
{
delta = -1;
distance = -distance;
}
else
{
delta = 1;
}
for(int i = 0; i < distance; i++)
{
yPosition += delta;
draw();
}
}
/**
* Change the size to the new size (in pixels). Size must be >= 0.
*/
public void changeSize(int newHeight, int newWidth)
{
erase();
height = newHeight;
width = newWidth;
draw();
}
/**
* Change the color. Valid colors are "red", "yellow", "blue", "green",
* "magenta" and "black".
*/
public void changeColor(String newColor)
{
color = newColor;
draw();
}
/**
* Draw the person with current specifications on screen.
*/
private void draw()
{
int bh = (int)(height * 0.7); // body height
int hh = (height - bh) / 2; // half head height
int hw = width / 2; // half width
int x = xPosition;
int y = yPosition;
if(isVisible) {
Canvas canvas = Canvas.getCanvas();
int[] xpoints = { x-3, x-hw, x-hw, x-(int)(hw*0.2)-1, x-(int)(hw*0.2)-1, x-hw,
x-hw+(int)(hw*0.4)+1, x, x+hw-(int)(hw*0.4)-1, x+hw, x+(int)(hw*0.2)+1,
x+(int)(hw*0.2)+1, x+hw, x+hw, x+3, x+(int)(hw*0.6),
x+(int)(hw*0.6), x+3, x-3, x-(int)(hw*0.6), x-(int)(hw*0.6) };
int[] ypoints = { y, y+(int)(bh*0.2), y+(int)(bh*0.4), y+(int)(bh*0.2),
y+(int)(bh*0.5), y+bh, y+bh, y+(int)(bh*0.65), y+bh, y+bh,
y+(int)(bh*0.5), y+(int)(bh*0.2), y+(int)(bh*0.4), y+(int)(bh*0.2),
y, y-hh+3, y-hh-3, y-hh-hh, y-hh-hh, y-hh-3, y-hh+3 };
canvas.draw(this, color, new Polygon(xpoints, ypoints, 21));
canvas.wait(10);
}
}
/**
* Erase the person on screen.
*/
private void erase()
{
if(isVisible) {
Canvas canvas = Canvas.getCanvas();
canvas.erase(this);
}
}
}

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#BlueJ class context
comment0.params=
comment0.target=Picture()
comment0.text=\n\ Constructor\ for\ objects\ of\ class\ Picture\n
comment1.params=
comment1.target=void\ draw()
comment1.text=\n\ Draw\ this\ picture.\n
comment2.params=
comment2.target=void\ setBlackAndWhite()
comment2.text=\n\ Change\ this\ picture\ to\ black/white\ display\n
comment3.params=
comment3.target=void\ setColor()
comment3.text=\n\ Change\ this\ picture\ to\ use\ color\ display\n
comment4.params=
comment4.target=void\ doSunset()
comment4.text=\n\ Start\ Sunset\n
comment5.params=
comment5.target=void\ doSunrise()
comment5.text=\n\ Start\ Sunrise\n
numComments=6

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/**
* This class represents a simple picture. You can draw the picture using
* the draw method. But wait, there's more: being an electronic picture, it
* can be changed. You can set it to black-and-white display and back to
* colors (only after it's been drawn, of course).
*
* This class was written as an early example for teaching Java with BlueJ.
*
* @author Michael K<>lling and David J. Barnes
* @version 2016.02.29
*/
public class Picture
{
private Square wall;
private Square window;
private Triangle roof;
private Circle sun;
private Circle sun2;
private Person person;
private boolean drawn;
/**
* Constructor for objects of class Picture
*/
public Picture()
{
wall = new Square();
window = new Square();
roof = new Triangle();
sun = new Circle();
//sun2 = new Circle();
person = new Person();
drawn = false;
}
/**
* Draw this picture.
*/
public void draw()
{
if(!drawn) {
wall.moveHorizontal(-140);
wall.moveVertical(20);
wall.changeSize(120);
wall.makeVisible();
window.changeColor("black");
window.moveHorizontal(-120);
window.moveVertical(40);
window.changeSize(40);
window.makeVisible();
roof.changeSize(60, 180);
roof.moveHorizontal(20);
roof.moveVertical(-60);
roof.makeVisible();
sun.changeColor("blue");
sun.moveHorizontal(100);
sun.moveVertical(-40);
sun.changeSize(80);
sun.makeVisible();
//sun2.changeColor("yellow");
//sun2.moveHorizontal(30);
//sun2.moveVertical(-35);
//sun2.changeSize(50);
//sun2.makeVisible();
drawn = true;
}
}
/**
* Change this picture to black/white display
*/
public void setBlackAndWhite()
{
wall.changeColor("black");
window.changeColor("white");
roof.changeColor("black");
sun.changeColor("black");
//sun2.changeColor("black");
}
/**
* Change this picture to use color display
*/
public void setColor()
{
wall.changeColor("red");
window.changeColor("black");
roof.changeColor("green");
sun.changeColor("yellow");
//sun2.changeColor("green");
}
/**
* Start Sunset
*/
public void doSunset()
{
sun.slowMoveVertical(250);
setBlackAndWhite();
}
/**
* Start Sunrise
*/
public void doSunrise()
{
sun.slowMoveVertical(-250);
setColor();
}
}

19
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Project "house"
Authors: Michael K<>lling and David J. Barnes
This project is part of the material for the book
Objects First with Java - A Practical Introduction using BlueJ
Sixth edition
David J. Barnes and Michael K<>lling
Pearson Education, 2016
It is discussed in chapter 1.
This is a very simple project to demonstrate some characteristics of
objects.
This project is often used after studying the "shapes" project. It
adds a class to those ones in "shapes". That class (named "Picture")
uses the shapes to draw a picture. It can be used to experiment with
modifying source code.

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#BlueJ class context
comment0.params=
comment0.target=Square()
comment0.text=\n\ Create\ a\ new\ square\ at\ default\ position\ with\ default\ color.\n
comment1.params=
comment1.target=void\ makeVisible()
comment1.text=\n\ Make\ this\ square\ visible.\ If\ it\ was\ already\ visible,\ do\ nothing.\n
comment10.params=distance
comment10.target=void\ slowMoveVertical(int)
comment10.text=\n\ Slowly\ move\ the\ square\ vertically\ by\ 'distance'\ pixels.\n
comment11.params=newSize
comment11.target=void\ changeSize(int)
comment11.text=\n\ Change\ the\ size\ to\ the\ new\ size\ (in\ pixels).\ Size\ must\ be\ >\=\ 0.\n
comment12.params=newColor
comment12.target=void\ changeColor(java.lang.String)
comment12.text=\n\ Change\ the\ color.\ Valid\ colors\ are\ "red",\ "yellow",\ "blue",\ "green",\n\ "magenta"\ and\ "black".\n
comment13.params=
comment13.target=void\ draw()
comment13.text=\n\ Draw\ the\ square\ with\ current\ specifications\ on\ screen.\n
comment14.params=
comment14.target=void\ erase()
comment14.text=\n\ Erase\ the\ square\ on\ screen.\n
comment2.params=
comment2.target=void\ makeInvisible()
comment2.text=\n\ Make\ this\ square\ invisible.\ If\ it\ was\ already\ invisible,\ do\ nothing.\n
comment3.params=
comment3.target=void\ moveRight()
comment3.text=\n\ Move\ the\ square\ a\ few\ pixels\ to\ the\ right.\n
comment4.params=
comment4.target=void\ moveLeft()
comment4.text=\n\ Move\ the\ square\ a\ few\ pixels\ to\ the\ left.\n
comment5.params=
comment5.target=void\ moveUp()
comment5.text=\n\ Move\ the\ square\ a\ few\ pixels\ up.\n
comment6.params=
comment6.target=void\ moveDown()
comment6.text=\n\ Move\ the\ square\ a\ few\ pixels\ down.\n
comment7.params=distance
comment7.target=void\ moveHorizontal(int)
comment7.text=\n\ Move\ the\ square\ horizontally\ by\ 'distance'\ pixels.\n
comment8.params=distance
comment8.target=void\ moveVertical(int)
comment8.text=\n\ Move\ the\ square\ vertically\ by\ 'distance'\ pixels.\n
comment9.params=distance
comment9.target=void\ slowMoveHorizontal(int)
comment9.text=\n\ Slowly\ move\ the\ square\ horizontally\ by\ 'distance'\ pixels.\n
numComments=15

191
Semester 1/Programming 1/Java/Chapter01/House with Two Suns/Square.java Normal file
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import java.awt.*;
/**
* A square that can be manipulated and that draws itself on a canvas.
*
* @author Michael K<>lling and David J. Barnes
* @version 2016.02.29
*/
public class Square
{
private int size;
private int xPosition;
private int yPosition;
private String color;
private boolean isVisible;
/**
* Create a new square at default position with default color.
*/
public Square()
{
size = 60;
xPosition = 310;
yPosition = 120;
color = "red";
isVisible = false;
}
/**
* Make this square visible. If it was already visible, do nothing.
*/
public void makeVisible()
{
isVisible = true;
draw();
}
/**
* Make this square invisible. If it was already invisible, do nothing.
*/
public void makeInvisible()
{
erase();
isVisible = false;
}
/**
* Move the square a few pixels to the right.
*/
public void moveRight()
{
moveHorizontal(20);
}
/**
* Move the square a few pixels to the left.
*/
public void moveLeft()
{
moveHorizontal(-20);
}
/**
* Move the square a few pixels up.
*/
public void moveUp()
{
moveVertical(-20);
}
/**
* Move the square a few pixels down.
*/
public void moveDown()
{
moveVertical(20);
}
/**
* Move the square horizontally by 'distance' pixels.
*/
public void moveHorizontal(int distance)
{
erase();
xPosition += distance;
draw();
}
/**
* Move the square vertically by 'distance' pixels.
*/
public void moveVertical(int distance)
{
erase();
yPosition += distance;
draw();
}
/**
* Slowly move the square horizontally by 'distance' pixels.
*/
public void slowMoveHorizontal(int distance)
{
int delta;
if(distance < 0)
{
delta = -1;
distance = -distance;
}
else
{
delta = 1;
}
for(int i = 0; i < distance; i++)
{
xPosition += delta;
draw();
}
}
/**
* Slowly move the square vertically by 'distance' pixels.
*/
public void slowMoveVertical(int distance)
{
int delta;
if(distance < 0)
{
delta = -1;
distance = -distance;
}
else
{
delta = 1;
}
for(int i = 0; i < distance; i++)
{
yPosition += delta;
draw();
}
}
/**
* Change the size to the new size (in pixels). Size must be >= 0.
*/
public void changeSize(int newSize)
{
erase();
size = newSize;
draw();
}
/**
* Change the color. Valid colors are "red", "yellow", "blue", "green",
* "magenta" and "black".
*/
public void changeColor(String newColor)
{
color = newColor;
draw();
}
/**
* Draw the square with current specifications on screen.
*/
private void draw()
{
if(isVisible) {
Canvas canvas = Canvas.getCanvas();
canvas.draw(this, color,
new Rectangle(xPosition, yPosition, size, size));
canvas.wait(10);
}
}
/**
* Erase the square on screen.
*/
private void erase()
{
if(isVisible) {
Canvas canvas = Canvas.getCanvas();
canvas.erase(this);
}
}
}

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#BlueJ class context
comment0.params=
comment0.target=Triangle()
comment0.text=\n\ Create\ a\ new\ triangle\ at\ default\ position\ with\ default\ color.\n
comment1.params=
comment1.target=void\ makeVisible()
comment1.text=\n\ Make\ this\ triangle\ visible.\ If\ it\ was\ already\ visible,\ do\ nothing.\n
comment10.params=distance
comment10.target=void\ slowMoveVertical(int)
comment10.text=\n\ Slowly\ move\ the\ triangle\ vertically\ by\ 'distance'\ pixels.\n
comment11.params=newHeight\ newWidth
comment11.target=void\ changeSize(int,\ int)
comment11.text=\n\ Change\ the\ size\ to\ the\ new\ size\ (in\ pixels).\ Size\ must\ be\ >\=\ 0.\n
comment12.params=newColor
comment12.target=void\ changeColor(java.lang.String)
comment12.text=\n\ Change\ the\ color.\ Valid\ colors\ are\ "red",\ "yellow",\ "blue",\ "green",\n\ "magenta"\ and\ "black".\n
comment13.params=
comment13.target=void\ draw()
comment13.text=\n\ Draw\ the\ triangle\ with\ current\ specifications\ on\ screen.\n
comment14.params=
comment14.target=void\ erase()
comment14.text=\n\ Erase\ the\ triangle\ on\ screen.\n
comment2.params=
comment2.target=void\ makeInvisible()
comment2.text=\n\ Make\ this\ triangle\ invisible.\ If\ it\ was\ already\ invisible,\ do\ nothing.\n
comment3.params=
comment3.target=void\ moveRight()
comment3.text=\n\ Move\ the\ triangle\ a\ few\ pixels\ to\ the\ right.\n
comment4.params=
comment4.target=void\ moveLeft()
comment4.text=\n\ Move\ the\ triangle\ a\ few\ pixels\ to\ the\ left.\n
comment5.params=
comment5.target=void\ moveUp()
comment5.text=\n\ Move\ the\ triangle\ a\ few\ pixels\ up.\n
comment6.params=
comment6.target=void\ moveDown()
comment6.text=\n\ Move\ the\ triangle\ a\ few\ pixels\ down.\n
comment7.params=distance
comment7.target=void\ moveHorizontal(int)
comment7.text=\n\ Move\ the\ triangle\ horizontally\ by\ 'distance'\ pixels.\n
comment8.params=distance
comment8.target=void\ moveVertical(int)
comment8.text=\n\ Move\ the\ triangle\ vertically\ by\ 'distance'\ pixels.\n
comment9.params=distance
comment9.target=void\ slowMoveHorizontal(int)
comment9.text=\n\ Slowly\ move\ the\ triangle\ horizontally\ by\ 'distance'\ pixels.\n
numComments=15

195
Semester 1/Programming 1/Java/Chapter01/House with Two Suns/Triangle.java Normal file
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import java.awt.*;
/**
* A triangle that can be manipulated and that draws itself on a canvas.
*
* @author Michael K<>lling and David J. Barnes
* @version 2016.02.29
*/
public class Triangle
{
private int height;
private int width;
private int xPosition;
private int yPosition;
private String color;
private boolean isVisible;
/**
* Create a new triangle at default position with default color.
*/
public Triangle()
{
height = 60;
width = 70;
xPosition = 210;
yPosition = 140;
color = "green";
isVisible = false;
}
/**
* Make this triangle visible. If it was already visible, do nothing.
*/
public void makeVisible()
{
isVisible = true;
draw();
}
/**
* Make this triangle invisible. If it was already invisible, do nothing.
*/
public void makeInvisible()
{
erase();
isVisible = false;
}
/**
* Move the triangle a few pixels to the right.
*/
public void moveRight()
{
moveHorizontal(20);
}
/**
* Move the triangle a few pixels to the left.
*/
public void moveLeft()
{
moveHorizontal(-20);
}
/**
* Move the triangle a few pixels up.
*/
public void moveUp()
{
moveVertical(-20);
}
/**
* Move the triangle a few pixels down.
*/
public void moveDown()
{
moveVertical(20);
}
/**
* Move the triangle horizontally by 'distance' pixels.
*/
public void moveHorizontal(int distance)
{
erase();
xPosition += distance;
draw();
}
/**
* Move the triangle vertically by 'distance' pixels.
*/
public void moveVertical(int distance)
{
erase();
yPosition += distance;
draw();
}
/**
* Slowly move the triangle horizontally by 'distance' pixels.
*/
public void slowMoveHorizontal(int distance)
{
int delta;
if(distance < 0)
{
delta = -1;
distance = -distance;
}
else
{
delta = 1;
}
for(int i = 0; i < distance; i++)
{
xPosition += delta;
draw();
}
}
/**
* Slowly move the triangle vertically by 'distance' pixels.
*/
public void slowMoveVertical(int distance)
{
int delta;
if(distance < 0)
{
delta = -1;
distance = -distance;
}
else
{
delta = 1;
}
for(int i = 0; i < distance; i++)
{
yPosition += delta;
draw();
}
}
/**
* Change the size to the new size (in pixels). Size must be >= 0.
*/
public void changeSize(int newHeight, int newWidth)
{
erase();
height = newHeight;
width = newWidth;
draw();
}
/**
* Change the color. Valid colors are "red", "yellow", "blue", "green",
* "magenta" and "black".
*/
public void changeColor(String newColor)
{
color = newColor;
draw();
}
/**
* Draw the triangle with current specifications on screen.
*/
private void draw()
{
if(isVisible) {
Canvas canvas = Canvas.getCanvas();
int[] xpoints = { xPosition, xPosition + (width/2), xPosition - (width/2) };
int[] ypoints = { yPosition, yPosition + height, yPosition + height };
canvas.draw(this, color, new Polygon(xpoints, ypoints, 3));
canvas.wait(10);
}
}
/**
* Erase the triangle on screen.
*/
private void erase()
{
if(isVisible) {
Canvas canvas = Canvas.getCanvas();
canvas.erase(this);
}
}
}

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#BlueJ package file
dependency1.from=Triangle
dependency1.to=Canvas
dependency1.type=UsesDependency
dependency2.from=Picture
dependency2.to=Square
dependency2.type=UsesDependency
dependency3.from=Picture
dependency3.to=Triangle
dependency3.type=UsesDependency
dependency4.from=Picture
dependency4.to=Circle
dependency4.type=UsesDependency
dependency5.from=Circle
dependency5.to=Canvas
dependency5.type=UsesDependency
dependency6.from=Square
dependency6.to=Canvas
dependency6.type=UsesDependency
dependency7.from=Person
dependency7.to=Canvas
dependency7.type=UsesDependency
dependency8.from=Picture
dependency8.to=Person
dependency8.type=UsesDependency
objectbench.height=76
objectbench.width=940
package.editor.height=874
package.editor.width=814
package.editor.x=0
package.editor.y=31
package.numDependencies=8
package.numTargets=6
package.showExtends=true
package.showUses=true
project.charset=x-MacRoman
readme.editor.height=557
readme.editor.width=826
readme.editor.x=53
readme.editor.y=23
target1.editor.height=717
target1.editor.width=900
target1.editor.x=53
target1.editor.y=60
target1.height=50
target1.name=Circle
target1.naviview.expanded=true
target1.showInterface=false
target1.type=ClassTarget
target1.typeParameters=
target1.width=80
target1.x=150
target1.y=230
target2.editor.height=774
target2.editor.width=857
target2.editor.x=660
target2.editor.y=201
target2.height=50
target2.name=Picture
target2.naviview.expanded=true
target2.showInterface=false
target2.type=ClassTarget
target2.typeParameters=
target2.width=80
target2.x=70
target2.y=70
target3.editor.height=781
target3.editor.width=898
target3.editor.x=53
target3.editor.y=51
target3.height=50
target3.name=Canvas
target3.naviview.expanded=true
target3.showInterface=false
target3.type=ClassTarget
target3.typeParameters=
target3.width=80
target3.x=50
target3.y=310
target4.editor.height=727
target4.editor.width=936
target4.editor.x=53
target4.editor.y=60
target4.height=50
target4.name=Triangle
target4.naviview.expanded=true
target4.showInterface=false
target4.type=ClassTarget
target4.typeParameters=
target4.width=80
target4.x=350
target4.y=150
target5.editor.height=722
target5.editor.width=879
target5.editor.x=53
target5.editor.y=60
target5.height=50
target5.name=Square
target5.naviview.expanded=true
target5.showInterface=false
target5.type=ClassTarget
target5.typeParameters=
target5.width=80
target5.x=250
target5.y=190
target6.editor.height=697
target6.editor.width=988
target6.editor.x=53
target6.editor.y=90
target6.height=50
target6.name=Person
target6.naviview.expanded=true
target6.showInterface=false
target6.type=ClassTarget
target6.typeParameters=
target6.width=80
target6.x=450
target6.y=120

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import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
/**
* Class CaseConverter - A simple applet that takes input from a text field
* and converts to upper or lower case in response to user button selection.
* Works well with a width of 300 and height of 120.
*
* Aug 2004: Updated from Applet to JApplet (mik)
*
* @author Bruce Quig
* @author Michael Kolling
*
* @version 2004-08-04
*/
public class CaseConverter extends JApplet
implements ActionListener
{
private JTextField inputField;
private final String UPPERCASE = "UPPERCASE";
private final String LOWERCASE = "lowercase";
private final String CLEAR = "Clear";
/**
* Called by the browser or applet viewer to inform this JApplet that it
* has been loaded into the system. It is always called before the first
* time that the start method is called.
*/
public void init()
{
// GUI elements are added to the applet's content pane, so get it for us.
Container contentPane = getContentPane();
// set a layout with some spacing
contentPane.setLayout(new BorderLayout(12,12));
// add the title label
JLabel title = new JLabel("Case Converter - A BlueJ demo applet");
contentPane.add(title, BorderLayout.NORTH);
// create the center part with prompt and text field and add it
JPanel centerPanel = new JPanel();
JLabel prompt = new JLabel("Enter a string:");
centerPanel.add(prompt);
inputField = new JTextField(16);
centerPanel.add(inputField);
contentPane.add(centerPanel, BorderLayout.CENTER);
// make a panel for the buttons
JPanel buttonPanel = new JPanel();
// add the buttons to the button panel
JButton uppercase = new JButton(UPPERCASE);
uppercase.addActionListener(this);
buttonPanel.add(uppercase);
JButton lowercase = new JButton(LOWERCASE);
lowercase.addActionListener(this);
buttonPanel.add(lowercase);
JButton clear = new JButton(CLEAR);
clear.addActionListener(this);
buttonPanel.add(clear);
// add the buttons panel to the content pane
contentPane.add(buttonPanel, BorderLayout.SOUTH);
}
/**
* Returns information about this applet.
* An applet should override this method to return a String containing
* information about the author, version, and copyright of the JApplet.
*
* @return a String representation of information about this JApplet
*/
public String getAppletInfo()
{
return "Title: Case Converter \n" +
"Author: Bruce Quig \n" +
"A simple applet that converts text to upper or lower case. ";
}
/**
* ActionListener Interface method.
* Called when action events occur with registered components that
* can fire action events.
* @param ae the ActionEvent object created by the event
*/
public void actionPerformed(ActionEvent evt)
{
String command = evt.getActionCommand();
// if clear button pressed
if(CLEAR.equals(command))
inputField.setText("");
// uppercase button pressed
else if(UPPERCASE.equals(command))
inputField.setText(inputField.getText().toUpperCase());
// lowercase button pressed
else if(LOWERCASE.equals(command))
inputField.setText(inputField.getText().toLowerCase());
}
}

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BlueJ example project "appletdemo"
Copyright (c) Bruce Quig, Michael K<>lling, Monash University, 1999-2000
This project is distributed with the BlueJ distribution as an example of an
applet.
To start this applet, choose "Run Applet" from the class's popup menu and
click OK in the following dialogue.

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#BlueJ package file
package.editor.height=234
package.editor.width=358
package.editor.x=20
package.editor.y=42
package.numDependencies=0
package.numTargets=1
target1.appletHeight=250
target1.appletWidth=250
target1.height=60
target1.modifiers=0
target1.name=CaseConverter
target1.numberAppletParameters=0
target1.type=AppletTarget
target1.width=110
target1.x=90
target1.y=80

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/**
* Class Car - nonsense class for debugger demo
*
* @author Michael Kolling
* @version 13 August 1999
*/
public class Car
{
private int numberOfFrontSeats;
private int numberOfBackSeats;
/**
* Create a car with seat numbers
*/
public Car(int frontSeats, int backSeats)
{
numberOfFrontSeats = frontSeats;
numberOfBackSeats = backSeats;
}
/**
* Return the number of seats in the car.
*/
public int seats()
{
int totalSeats;
totalSeats = numberOfFrontSeats;
totalSeats += numberOfBackSeats;
return totalSeats;
}
}

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/**
* Class Demo - this class is used in the BlueJ tutorial for demonstrating
* the BlueJ debug functionality. It contains loops and nested method calls
* that make interesting examples to set breakpoints.
*
* @author M. Kolling
* @version 13 August 1999
*/
public class Demo
{
private String name;
private int answer;
/**
* Constructor for objects of class Demo
*/
public Demo()
{
name = "Marvin";
answer = 42;
}
/**
* Loop for a while and do some meaningless computations.
*/
public int loop(int count)
{
int sum = 17;
for (int i=0; i<count; i++) {
sum = sum + i;
sum = sum - 2;
}
return sum;
}
/**
* Method for demonstrating single stepping with nested method call.
*/
public int carTest()
{
int places;
Car myCar = new Car(2, 3);
places = myCar.seats();
return places;
}
public int longloop()
{
int sum = 0;
for (int i=0; i<20000000; i++) {
sum = sum + i;
sum = sum -200;
}
return 42;
}
}

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BlueJ example project "debugdemo"
Copyright (c) Michael Kolling, Monash University, 1999-2000
This project is distributed with the BlueJ system to provide an example
for testing the debugger. The project does not make any sense at all. Its
purpose is to provide some loops and method calls to practice setting
breakpoints and sigle-stepping through the code.
This project is referred to in the BlueJ tutorial.
To start this project, create a "Demo" object and select any of its methods.

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#BlueJ package file
dependency1.from=Demo
dependency1.to=Car
dependency1.type=UsesDependency
package.editor.height=250
package.editor.width=468
package.editor.x=40
package.editor.y=62
package.numDependencies=1
package.numTargets=2
target1.height=50
target1.modifiers=0
target1.name=Demo
target1.type=ClassTarget
target1.width=80
target1.x=70
target1.y=40
target2.height=50
target2.modifiers=0
target2.name=Car
target2.type=ClassTarget
target2.width=80
target2.x=220
target2.y=100

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import java.io.*;
import java.net.URL;
/**
* This is a little demo showing how to read text files. It will find files
* that are situated anywhere in the classpath.
*
* Currently, two demo methods are available. Both simply print a text file to the
* terminal. One returns exceptions in case of a problem, the other prints out
* error messages.
*
* @author Michael K<>lling
* @version 1.0 (19. Feb 2002)
*/
public class FileReader
{
/**
* Create a file reader
*/
public FileReader()
{
// nothing to do...
}
/**
* Show the contents of the file 'fileName' on standard out (the text terminal).
*
* @param fileName The name of the file to show
* @throws IOException if the file could not be opened
*/
public void showFile(String fileName)
throws IOException
{
InputStream fstream = openFile(fileName);
// wrap the stream into an InputStreamReader, so that we read characters
// rather than bytes (important for non-ascii characters); then wrap it into
// a BufferedReader, so that we can read lines, rather than single characters
BufferedReader in = new BufferedReader(new InputStreamReader(fstream));
// okay, we're ready to go...
System.out.println("File: " + fileName);
String line = in.readLine();
while(line != null) {
System.out.println(line);
line = in.readLine();
}
System.out.println("<end of file>");
}
/**
* Same as 'showfile', but don't throw exceptions. If an error occurs,
* write an error message to the terminal.
*
* @param fileName The name of the file to show
*/
public void checkedShowFile(String fileName)
{
try {
showFile(fileName);
}
catch(IOException exc) {
System.out.println("There was a problem showing this file.");
System.out.println("The error encountered is:");
System.out.println(exc);
}
}
/**
* Open a text file and return a stream to read from that file.
* The file can reside anywhere in the classpath.
*
* @param fileName The name of the file to open
* @return An open stream to read from the file
* @throws IOException if the file could not be opened
*/
public InputStream openFile(String fileName)
throws IOException
{
if(fileName == null)
throw new IOException("Cannot open file - filename was null.");
URL url = getClass().getClassLoader().getResource(fileName);
if(url == null)
throw new IOException("File not found: " + fileName);
return url.openStream();
}
}

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This is a small demo showing how to access a file in a safe way.
Especially: access to the file does not depend on the current directory,
but files will be found anywhere in the classpath. So text files placed
inside the project directory wll be found.
A file for testing is include in this project. It is called "test.txt".
(You can also access this file - "README.TXT".)
-mik-, Feb 2002

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#BlueJ package file
package.editor.height=300
package.editor.width=420
package.editor.x=40
package.editor.y=62
package.numDependencies=0
package.numTargets=1
target1.height=50
target1.modifiers=0
target1.name=FileReader
target1.type=ClassTarget
target1.width=90
target1.x=140
target1.y=70

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This is a plain text file.

24
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/**
* Class Hello:
*
* Hello-world program to demonstrate BlueJ.
*/
class Hello
{
/**
* Method that does the work
*/
public void go()
{
System.out.println("Hello, world");
}
/**
* main method for testing outside BlueJ
*/
public static void main(String[] args)
{
Hello hi = new Hello();
hi.go();
}
}

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BlueJ example project "hello"
Copyright (c) Michael K<>lling, Monash University, 1999-2000
This is "Hello world".
This project is distributed with the BlueJ system to make all those people
happy who want to look at "Hello World" before anything else.
Please note that I think that this project is totally unsuitable to learn
or teach anything about object-orientation. There is no sensible use of
objects in this problem, and I do not recommend using it for teaching OO.
You can start this project in two ways:
- create a "Hello" object and run its "go" method, or
- execute the static "main" method of the "Hello" class
Michael K<>lling, August 2000

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#BlueJ package file
package.editor.height=239
package.editor.width=352
package.editor.x=60
package.editor.y=82
package.numDependencies=0
package.numTargets=1
target1.height=50
target1.modifiers=1
target1.name=Hello
target1.type=ClassTarget
target1.width=80
target1.x=90
target1.y=60

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#BlueJ class context
comment0.target=Database()
comment0.text=\nCreate\ a\ new,\ empty\ person\ database.\n\n
comment1.params=p
comment1.target=void\ addPerson(Person)
comment1.text=\nAdd\ a\ person\ to\ the\ database.\n\n
comment2.target=void\ listAll()
comment2.text=\nList\ all\ the\ persons\ currently\ in\ the\ database\ on\ standard\ out.\n\n
numComments=3

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import java.util.ArrayList;
import java.util.Iterator;
/**
* A very simple database of people in a university. This class simply stores
* persons and, at request, lists them on standard output.
*
* Written as a first demo program for BlueJ.
*
* @author Michael Kolling
* @version 1.1, March 2002
*/
public class Database {
private ArrayList persons;
/**
* Create a new, empty person database.
*/
public Database()
{
persons = new ArrayList();
}
/**
* Add a person to the database.
*/
public void addPerson(Person p)
{
persons.add(p);
}
/**
* List all the persons currently in the database on standard out.
*/
public void listAll ()
{
for (Iterator i = persons.iterator(); i.hasNext();) {
System.out.println(i.next());
}
}
}

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#BlueJ class context
comment0.params=name\ yearOfBirth
comment0.target=Person(String,\ int)
comment0.text=\nCreate\ a\ person\ with\ given\ name\ and\ age.\n\n
comment1.params=newName
comment1.target=void\ setName(String)
comment1.text=\nSet\ a\ new\ name\ for\ this\ person.\n\n
comment2.target=String\ getName()
comment2.text=\nReturn\ the\ name\ of\ this\ person.\n\n
comment3.params=newYearOofBirth
comment3.target=void\ setYearOfBirth(int)
comment3.text=\nSet\ a\ new\ birth\ year\ for\ this\ person.\n\n
comment4.target=int\ getYearOfBirth()
comment4.text=\nReturn\ the\ birth\ year\ of\ this\ person.\n\n
comment5.target=String\ toString()
comment5.text=\nReturn\ a\ string\ representation\ of\ this\ object.\n\n
numComments=6

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/**
* A person class for a simple BlueJ demo program. Person is used as
* an abstract superclass of more specific person classes.
*
* @author Michael Kolling
* @version 1.0, January 1999
*/
abstract class Person
{
private String name;
private int yearOfBirth;
/**
* Create a person with given name and age.
*/
Person(String name, int yearOfBirth)
{
this.name = name;
this.yearOfBirth = yearOfBirth;
}
/**
* Set a new name for this person.
*/
public void setName(String newName)
{
name = newName;
}
/**
* Return the name of this person.
*/
public String getName()
{
return name;
}
/**
* Set a new birth year for this person.
*/
public void setYearOfBirth(int newYearOofBirth)
{
yearOfBirth = newYearOofBirth;
}
/**
* Return the birth year of this person.
*/
public int getYearOfBirth()
{
return yearOfBirth;
}
/**
* Return a string representation of this object.
*/
public String toString() // redefined from "Object"
{
return "Name: " + name + "\n" +
"Year of birth: " + yearOfBirth + "\n";
}
}

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BlueJ example project "people"
Copyright (c) Michael K<>lling, Monash University, 1999-2000
This is a very simple BlueJ demo project. It illustrates some aspects of
object-orientation as well as aspects of BlueJ.
This project is distributed with the BlueJ system to serve as an introductory
practice example. It is referred to in the BlueJ tutorial. Please read the
tutorial (which you can get by selecting "BlueJ Tutorial..." from the Help
menu ion the BlueJ main window) for more detailed information.
You can use this project as follows:
- create a few Staff or Student obejcts
- create a Database object
- use "addPerson" in Database to add the persons you have created previously
from the object bench to the database
- use the "listAll" from the database object to list the contents of the
database.
This project illustrates:
- object creation
- relationship class-object (create _more then one_ object!)
- instance data (use "Inspect" on the objects)
- methods, parameters
- composition
- ...

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#BlueJ class context
comment0.target=Staff()
comment0.text=\nCreate\ a\ staff\ member\ with\ default\ settings\ for\ detail\ information.\n\n
comment1.params=name\ yearOfBirth\ roomNumber
comment1.target=Staff(String,\ int,\ String)
comment1.text=\nCreate\ a\ staff\ member\ with\ given\ name,\ year\ of\ birth\ and\ room\nnumber.\n\n
comment2.params=newRoom
comment2.target=void\ setRoom(String)
comment2.text=\nSet\ a\ new\ room\ number\ for\ this\ person.\n\n
comment3.target=String\ getRoom()
comment3.text=\nReturn\ the\ room\ number\ of\ this\ person.\n\n
comment4.target=String\ toString()
comment4.text=\nReturn\ a\ string\ representation\ of\ this\ object.\n\n
numComments=5

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/**
* A class representing staff members for a simple BlueJ demo program.
*
* @author Michael Kolling
* @version 1.0, January 1999
*/
class Staff extends Person
{
private String room;
/**
* Create a staff member with default settings for detail information.
*/
Staff()
{
super("(unknown name)", 0000);
room = "(unknown room)";
}
/**
* Create a staff member with given name, year of birth and room
* number.
*/
Staff(String name, int yearOfBirth, String roomNumber)
{
super(name, yearOfBirth);
room = roomNumber;
}
/**
* Set a new room number for this person.
*/
public void setRoom(String newRoom)
{
room = newRoom;
}
/**
* Return the room number of this person.
*/
public String getRoom()
{
return room;
}
/**
* Return a string representation of this object.
*/
public String toString() // redefined from "Person"
{
return super.toString() +
"Staff member\n" +
"Room: " + room + "\n";
}
}

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#BlueJ class context
comment0.target=Student()
comment0.text=\nCreate\ a\ student\ with\ default\ settings\ for\ detail\ information.\n\n
comment1.params=name\ yearOfBirth\ studentID
comment1.target=Student(String,\ int,\ String)
comment1.text=\nCreate\ a\ student\ with\ given\ name,\ year\ of\ birth\ and\ student\ ID\n\n
comment2.target=String\ getStudentID()
comment2.text=\nReturn\ the\ student\ ID\ of\ this\ student.\n\n
comment3.target=String\ toString()
comment3.text=\nReturn\ a\ string\ representation\ of\ this\ object.\n\n
numComments=4

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/**
* A class representing students for a simple BlueJ demo program.
*
* @author Michael Kolling
* @version 1.0, January 1999
*/
class Student extends Person
{
private String SID; // student ID number
/**
* Create a student with default settings for detail information.
*/
Student()
{
super("(unknown name)", 0000);
SID = "(unknown ID)";
}
/**
* Create a student with given name, year of birth and student ID
*/
Student(String name, int yearOfBirth, String studentID)
{
super(name, yearOfBirth);
SID = studentID;
}
/**
* Return the student ID of this student.
*/
public String getStudentID()
{
return SID;
}
/**
* Return a string representation of this object.
*/
public String toString() // redefined from "Person"
{
return super.toString() +
"Student\n" +
"Student ID: " + SID + "\n";
}
}

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#BlueJ package file
dependency1.from=Database
dependency1.to=Person
dependency1.type=UsesDependency
package.editor.height=292
package.editor.width=427
package.editor.x=508
package.editor.y=119
package.numDependencies=1
package.numTargets=4
package.showExtends=true
package.showUses=true
target1.height=50
target1.name=Student
target1.showInterface=false
target1.type=ClassTarget
target1.width=80
target1.x=230
target1.y=190
target2.height=50
target2.name=Staff
target2.showInterface=false
target2.type=ClassTarget
target2.width=80
target2.x=110
target2.y=190
target3.height=50
target3.name=Database
target3.showInterface=false
target3.type=ClassTarget
target3.width=80
target3.x=70
target3.y=20
target4.height=50
target4.name=Person
target4.showInterface=false
target4.type=AbstractTarget
target4.width=80
target4.x=170
target4.y=90

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#Submitter per project properties
#Wed Nov 22 13:05:44 EST 2006
selectedNode=Submission by email

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/**
* Class Address - used to store address details for a post address
*
* @author Michael Kolling
* @version 1.0, January 1999
*/
public class Address
{
private String street;
private String town;
private String postCode;
private String country;
/**
* Construct an Address without country
*/
public Address(String street, String town, String postCode)
{
this(street, town, postCode, "");
}
/**
* Construct an Address with full details
*/
public Address(String street, String town, String postCode, String country)
{
this.street = street;
this.town = town;
this.postCode = postCode;
this.country = country;
}
/**
* Return a string representation of this object.
*/
public String toString()
{
return street + "\n" +
town + " " + postCode + "\n" +
country + "\n";
}
}

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import java.util.ArrayList;
import java.util.Iterator;
/**
* A very simple database of people in a university. This class simply stores
* persons and, at request, lists them on standard output.
*
* Written as a first demo program for BlueJ.
*
* @author Michael Kolling
* @version 1.1, March 2002
*/
public class Database {
private ArrayList persons;
/**
* Create a new, empty person database.
*/
public Database()
{
persons = new ArrayList();
}
/**
* Add a person to the database.
*/
public void addPerson(Person p)
{
persons.add(p);
}
/**
* List all the persons currently in the database on standard out.
*/
public void listAll ()
{
for (Iterator i = persons.iterator(); i.hasNext();) {
System.out.println(i.next());
}
}
}

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/**
* A person class for a simple BlueJ demo program. Person is used as
* an abstract superclass of more specific person classes.
*
* @author Michael Kolling
* @version 1.0, January 1999
*/
abstract class Person
{
private String name;
private int yearOfBirth;
private Address address;
/**
* Create a person with given name and age.
*/
Person(String name, int yearOfBirth)
{
this.name = name;
this.yearOfBirth = yearOfBirth;
}
/**
* Set a new name for this person.
*/
public void setName(String newName)
{
name = newName;
}
/**
* Return the name of this person.
*/
public String getName()
{
return name;
}
/**
* Set a new birth year for this person.
*/
public void setYearOfBirth(int newYearOfBirth)
{
yearOfBirth = newYearOfBirth;
}
/**
* Return the birth year of this person.
*/
public int getYearOfBirth()
{
return yearOfBirth;
}
/**
* Set a new address for this person.
*/
public void setAddress(String street, String town, String postCode)
{
address = new Address(street, town, postCode);
}
/**
* Return the address of this person.
*/
public Address getAddress()
{
return address;
}
/**
* Return a string representation of this object.
*/
public String toString() // redefined from "Object"
{
return "Name: " + name + "\n" +
"Year of birth: " + yearOfBirth + "\n";
}
}

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BlueJ example project "people2"
Copyright (c) Michael K<>lling, Monash University, 1999-2000
This is a very simple BlueJ demo project. It illustrates some aspects of
object-orientation as well as aspects of BlueJ.
This project is an extension of "people". It is identical to "people"
except for the addition of an "Address" class and an address attribute
in Person.
This project may be used to study object creation and method calls from
within other object (non-interactive).

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/**
* A class representing staff members for a simple BlueJ demo program.
*
* @author Michael Kolling
* @version 1.0, January 1999
*/
class Staff extends Person
{
private String room;
/**
* Create a staff member with default settings for detail information.
*/
Staff()
{
super("(unknown name)", 0000);
room = "(unknown room)";
}
/**
* Create a staff member with given name, year of birth and room
* number.
*/
Staff(String name, int yearOfBirth, String roomNumber)
{
super(name, yearOfBirth);
room = roomNumber;
}
/**
* Set a new room number for this person.
*/
public void setRoom(String newRoom)
{
room = newRoom;
}
/**
* Return the room number of this person.
*/
public String getRoom()
{
return room;
}
/**
* Return a string representation of this object.
*/
public String toString() // redefined from "Person"
{
return super.toString() +
"Staff member\n" +
"Room: " + room + "\n";
}
}

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/**
* A class representing students for a simple BlueJ demo program.
*
* @author Michael Kolling
* @version 1.0, January 1999
*/
class Student extends Person
{
private String SID; // student ID number
/**
* Create a student with default settings for detail information.
*/
public Student()
{
super("(unknown name)", 0000);
SID = "(unknown ID)";
}
/**
* Create a student with given name, year of birth and student ID
*/
public Student(String name, int yearOfBirth, String studentID)
{
super(name, yearOfBirth);
SID = studentID;
}
/**
* Return the stident ID of this student.
*/
public String getStudentID()
{
return SID;
}
/**
* Return a string representation of this object.
*/
public String toString() // redefined from "Person"
{
return super.toString() +
"Student\n" +
"Student ID: " + SID + "\n";
}
}

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#BlueJ package file
dependency1.from=Person
dependency1.to=Address
dependency1.type=UsesDependency
dependency2.from=Database
dependency2.to=Person
dependency2.type=UsesDependency
package.editor.height=308
package.editor.width=445
package.editor.x=60
package.editor.y=82
package.numDependencies=2
package.numTargets=5
target1.height=50
target1.modifiers=0
target1.name=Student
target1.type=ClassTarget
target1.width=80
target1.x=260
target1.y=220
target2.height=50
target2.modifiers=400
target2.name=Person
target2.type=ClassTarget
target2.width=80
target2.x=190
target2.y=110
target3.height=50
target3.modifiers=0
target3.name=Staff
target3.type=ClassTarget
target3.width=80
target3.x=130
target3.y=220
target4.height=50
target4.modifiers=0
target4.name=Database
target4.type=ClassTarget
target4.width=80
target4.x=60
target4.y=40
target5.height=50
target5.modifiers=0
target5.name=Address
target5.type=ClassTarget
target5.width=80
target5.x=300
target5.y=20

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import javax.swing.*;
import java.awt.*;
import java.util.List;
import java.util.*;
/**
* Canvas is a class to allow for simple graphical drawing on a canvas.
* This is a modification of the general purpose Canvas, specially made for
* the BlueJ "shapes" example.
*
* @author: Bruce Quig
* @author: Michael Kolling (mik)
*
* @version: 1.6 (shapes)
*/
public class Canvas
{
// Note: The implementation of this class (specifically the handling of
// shape identity and colors) is slightly more complex than necessary. This
// is done on purpose to keep the interface and instance fields of the
// shape objects in this project clean and simple for educational purposes.
private static Canvas canvasSingleton;
/**
* Factory method to get the canvas singleton object.
*/
public static Canvas getCanvas()
{
if(canvasSingleton == null) {
canvasSingleton = new Canvas("BlueJ Shapes Demo", 300, 300,
Color.white);
}
canvasSingleton.setVisible(true);
return canvasSingleton;
}
// ----- instance part -----
private JFrame frame;
private CanvasPane canvas;
private Graphics2D graphic;
private Color backgroundColour;
private Image canvasImage;
private List objects;
private HashMap shapes;
/**
* Create a Canvas.
* @param title title to appear in Canvas Frame
* @param width the desired width for the canvas
* @param height the desired height for the canvas
* @param bgClour the desired background colour of the canvas
*/
private Canvas(String title, int width, int height, Color bgColour)
{
frame = new JFrame();
canvas = new CanvasPane();
frame.setContentPane(canvas);
frame.setTitle(title);
canvas.setPreferredSize(new Dimension(width, height));
backgroundColour = bgColour;
frame.pack();
objects = new ArrayList();
shapes = new HashMap();
}
/**
* Set the canvas visibility and brings canvas to the front of screen
* when made visible. This method can also be used to bring an already
* visible canvas to the front of other windows.
* @param visible boolean value representing the desired visibility of
* the canvas (true or false)
*/
public void setVisible(boolean visible)
{
if(graphic == null) {
// first time: instantiate the offscreen image and fill it with
// the background colour
Dimension size = canvas.getSize();
canvasImage = canvas.createImage(size.width, size.height);
graphic = (Graphics2D)canvasImage.getGraphics();
graphic.setColor(backgroundColour);
graphic.fillRect(0, 0, size.width, size.height);
graphic.setColor(Color.black);
}
frame.setVisible(visible);
}
/**
* Draw a given shape onto the canvas.
* @param referenceObject an object to define identity for this shape
* @param color the color of the shape
* @param shape the shape object to be drawn on the canvas
*/
// Note: this is a slightly backwards way of maintaining the shape
// objects. It is carefully designed to keep the visible shape interfaces
// in this project clean and simple for educational purposes.
public void draw(Object referenceObject, String color, Shape shape)
{
objects.remove(referenceObject); // just in case it was already there
objects.add(referenceObject); // add at the end
shapes.put(referenceObject, new ShapeDescription(shape, color));
redraw();
}
/**
* Erase a given shape's from the screen.
* @param referenceObject the shape object to be erased
*/
public void erase(Object referenceObject)
{
objects.remove(referenceObject); // just in case it was already there
shapes.remove(referenceObject);
redraw();
}
/**
* Set the foreground colour of the Canvas.
* @param newColour the new colour for the foreground of the Canvas
*/
public void setForegroundColor(String colorString)
{
if(colorString.equals("red"))
graphic.setColor(Color.red);
else if(colorString.equals("black"))
graphic.setColor(Color.black);
else if(colorString.equals("blue"))
graphic.setColor(Color.blue);
else if(colorString.equals("yellow"))
graphic.setColor(Color.yellow);
else if(colorString.equals("green"))
graphic.setColor(Color.green);
else if(colorString.equals("magenta"))
graphic.setColor(Color.magenta);
else if(colorString.equals("white"))
graphic.setColor(Color.white);
else
graphic.setColor(Color.black);
}
/**
* Wait for a specified number of milliseconds before finishing.
* This provides an easy way to specify a small delay which can be
* used when producing animations.
* @param milliseconds the number
*/
public void wait(int milliseconds)
{
try
{
Thread.sleep(milliseconds);
}
catch (Exception e)
{
// ignoring exception at the moment
}
}
/**
* Redraw ell shapes currently on the Canvas.
*/
private void redraw()
{
erase();
for(Iterator i=objects.iterator(); i.hasNext(); ) {
((ShapeDescription)shapes.get(i.next())).draw(graphic);
}
canvas.repaint();
}
/**
* Erase the whole canvas. (Does not repaint.)
*/
private void erase()
{
Color original = graphic.getColor();
graphic.setColor(backgroundColour);
Dimension size = canvas.getSize();
graphic.fill(new Rectangle(0, 0, size.width, size.height));
graphic.setColor(original);
}
/************************************************************************
* Inner class CanvasPane - the actual canvas component contained in the
* Canvas frame. This is essentially a JPanel with added capability to
* refresh the image drawn on it.
*/
private class CanvasPane extends JPanel
{
public void paint(Graphics g)
{
g.drawImage(canvasImage, 0, 0, null);
}
}
/************************************************************************
* Inner class CanvasPane - the actual canvas component contained in the
* Canvas frame. This is essentially a JPanel with added capability to
* refresh the image drawn on it.
*/
private class ShapeDescription
{
private Shape shape;
private String colorString;
public ShapeDescription(Shape shape, String color)
{
this.shape = shape;
colorString = color;
}
public void draw(Graphics2D graphic)
{
setForegroundColor(colorString);
graphic.fill(shape);
}
}
}

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import java.awt.*;
import java.awt.geom.*;
/**
* A circle that can be manipulated and that draws itself on a canvas.
*
* @author Michael Kolling and David J. Barnes
* @version 1.0 (15 July 2000)
*/
public class Circle
{
private int diameter;
private int xPosition;
private int yPosition;
private String color;
private boolean isVisible;
/**
* Create a new circle at default position with default color.
*/
public Circle()
{
diameter = 30;
xPosition = 20;
yPosition = 60;
color = "blue";
isVisible = false;
}
/**
* Make this circle visible. If it was already visible, do nothing.
*/
public void makeVisible()
{
isVisible = true;
draw();
}
/**
* Make this circle invisible. If it was already invisible, do nothing.
*/
public void makeInvisible()
{
erase();
isVisible = false;
}
/**
* Move the circle a few pixels to the right.
*/
public void moveRight()
{
moveHorizontal(20);
}
/**
* Move the circle a few pixels to the left.
*/
public void moveLeft()
{
moveHorizontal(-20);
}
/**
* Move the circle a few pixels up.
*/
public void moveUp()
{
moveVertical(-20);
}
/**
* Move the circle a few pixels down.
*/
public void moveDown()
{
moveVertical(20);
}
/**
* Move the circle horizontally by 'distance' pixels.
*/
public void moveHorizontal(int distance)
{
erase();
xPosition += distance;
draw();
}
/**
* Move the circle vertically by 'distance' pixels.
*/
public void moveVertical(int distance)
{
erase();
yPosition += distance;
draw();
}
/**
* Slowly move the circle horizontally by 'distance' pixels.
*/
public void slowMoveHorizontal(int distance)
{
int delta;
if(distance < 0)
{
delta = -1;
distance = -distance;
}
else
{
delta = 1;
}
for(int i = 0; i < distance; i++)
{
xPosition += delta;
draw();
}
}
/**
* Slowly move the circle vertically by 'distance' pixels.
*/
public void slowMoveVertical(int distance)
{
int delta;
if(distance < 0)
{
delta = -1;
distance = -distance;
}
else
{
delta = 1;
}
for(int i = 0; i < distance; i++)
{
yPosition += delta;
draw();
}
}
/**
* Change the size to the new size (in pixels). Size must be >= 0.
*/
public void changeSize(int newDiameter)
{
erase();
diameter = newDiameter;
draw();
}
/**
* Change the color. Valid colors are "red", "yellow", "blue", "green",
* "magenta" and "black".
*/
public void changeColor(String newColor)
{
color = newColor;
draw();
}
/*
* Draw the circle with current specifications on screen.
*/
private void draw()
{
if(isVisible) {
Canvas canvas = Canvas.getCanvas();
canvas.draw(this, color, new Ellipse2D.Double(xPosition, yPosition,
diameter, diameter));
canvas.wait(10);
}
}
/*
* Erase the circle on screen.
*/
private void erase()
{
if(isVisible) {
Canvas canvas = Canvas.getCanvas();
canvas.erase(this);
}
}
}

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/**
* This class represents a simple picture. You can draw the picture using
* the draw method. But wait, there's more: being an electronic picture, it
* can be changed. You can set it to black-and-white display and back to
* colors (only after it's been drawn, of course).
*
* This class was written as an early example for teaching Java with BlueJ.
*
* @author Michael Kolling and David J. Barnes
* @version 1.1 (24 May 2001)
*/
public class Picture
{
private Square wall;
private Square window;
private Triangle roof;
private Circle sun;
/**
* Constructor for objects of class Picture
*/
public Picture()
{
// nothing to do... instance variables are automatically set to null
}
/**
* Draw this picture.
*/
public void draw()
{
wall = new Square();
wall.moveVertical(80);
wall.changeSize(100);
wall.makeVisible();
window = new Square();
window.changeColor("black");
window.moveHorizontal(20);
window.moveVertical(100);
window.makeVisible();
roof = new Triangle();
roof.changeSize(50, 140);
roof.moveHorizontal(60);
roof.moveVertical(70);
roof.makeVisible();
sun = new Circle();
sun.changeColor("yellow");
sun.moveHorizontal(180);
sun.moveVertical(-10);
sun.changeSize(60);
sun.makeVisible();
}
/**
* Change this picture to black/white display
*/
public void setBlackAndWhite()
{
if(wall != null) // only if it's painted already...
{
wall.changeColor("black");
window.changeColor("white");
roof.changeColor("black");
sun.changeColor("black");
}
}
/**
* Change this picture to use color display
*/
public void setColor()
{
if(wall != null) // only if it's painted already...
{
wall.changeColor("red");
window.changeColor("black");
roof.changeColor("green");
sun.changeColor("yellow");
}
}
}

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Project "picture"
Authors: Michael Kolling and David J. Barnes
This project is part of the material for the book
Objects First with Java - A Practical Introduction using BlueJ
David J. Barnes and Michael Kolling
Pearson Education, 2002
It is discussed in chapter 1.
This is a very simple project to demonstrate some characteristics of
objects.
You can create various shapes, and you will see, if you do, that those
shapes are drawn on screen (in a window that we call the "canvas").
You can then manipulate these objects: change their position, size and
colour. Try it out: create a few different squares, triangles and circles.
This project is designed as a first example of object-oriented programming.
It illustrates a number of concepts:
- a Java project (application) is a collection of classes
- objects can be created from classes
- from any one class, many objects may be created
- objects have operations (methods)
- operations can have parameters
- parameters have types (at least String and int)
- objects hold data (fields)
- the operations and fields are common to all objects
- the values stored in the fields can be different for each object
The project also demonstrates
- BlueJ object creation
- interactive method invocation
- parameter passing
A good second project to look at after this is "picture", which adds a class
to those ones in this project. That class (named "Picture") uses the shapes
to draw a picture. It can be used to experiment with coding.
Michael K<>lling, July 2000

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import java.awt.*;
/**
* A square that can be manipulated and that draws itself on a canvas.
*
* @author Michael Kolling and David J. Barnes
* @version 1.0 (15 July 2000)
*/
public class Square
{
private int size;
private int xPosition;
private int yPosition;
private String color;
private boolean isVisible;
/**
* Create a new square at default position with default color.
*/
public Square()
{
size = 30;
xPosition = 60;
yPosition = 50;
color = "red";
isVisible = false;
}
/**
* Make this square visible. If it was already visible, do nothing.
*/
public void makeVisible()
{
isVisible = true;
draw();
}
/**
* Make this square invisible. If it was already invisible, do nothing.
*/
public void makeInvisible()
{
erase();
isVisible = false;
}
/**
* Move the square a few pixels to the right.
*/
public void moveRight()
{
moveHorizontal(20);
}
/**
* Move the square a few pixels to the left.
*/
public void moveLeft()
{
moveHorizontal(-20);
}
/**
* Move the square a few pixels up.
*/
public void moveUp()
{
moveVertical(-20);
}
/**
* Move the square a few pixels down.
*/
public void moveDown()
{
moveVertical(20);
}
/**
* Move the square horizontally by 'distance' pixels.
*/
public void moveHorizontal(int distance)
{
erase();
xPosition += distance;
draw();
}
/**
* Move the square vertically by 'distance' pixels.
*/
public void moveVertical(int distance)
{
erase();
yPosition += distance;
draw();
}
/**
* Slowly move the square horizontally by 'distance' pixels.
*/
public void slowMoveHorizontal(int distance)
{
int delta;
if(distance < 0)
{
delta = -1;
distance = -distance;
}
else
{
delta = 1;
}
for(int i = 0; i < distance; i++)
{
xPosition += delta;
draw();
}
}
/**
* Slowly move the square vertically by 'distance' pixels.
*/
public void slowMoveVertical(int distance)
{
int delta;
if(distance < 0)
{
delta = -1;
distance = -distance;
}
else
{
delta = 1;
}
for(int i = 0; i < distance; i++)
{
yPosition += delta;
draw();
}
}
/**
* Change the size to the new size (in pixels). Size must be >= 0.
*/
public void changeSize(int newSize)
{
erase();
size = newSize;
draw();
}
/**
* Change the color. Valid colors are "red", "yellow", "blue", "green",
* "magenta" and "black".
*/
public void changeColor(String newColor)
{
color = newColor;
draw();
}
/*
* Draw the square with current specifications on screen.
*/
private void draw()
{
if(isVisible) {
Canvas canvas = Canvas.getCanvas();
canvas.draw(this, color,
new Rectangle(xPosition, yPosition, size, size));
canvas.wait(10);
}
}
/*
* Erase the square on screen.
*/
private void erase()
{
if(isVisible) {
Canvas canvas = Canvas.getCanvas();
canvas.erase(this);
}
}
}

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import java.awt.*;
/**
* A triangle that can be manipulated and that draws itself on a canvas.
*
* @author Michael Kolling and David J. Barnes
* @version 1.0 (15 July 2000)
*/
public class Triangle
{
private int height;
private int width;
private int xPosition;
private int yPosition;
private String color;
private boolean isVisible;
/**
* Create a new triangle at default position with default color.
*/
public Triangle()
{
height = 30;
width = 40;
xPosition = 50;
yPosition = 15;
color = "green";
isVisible = false;
}
/**
* Make this triangle visible. If it was already visible, do nothing.
*/
public void makeVisible()
{
isVisible = true;
draw();
}
/**
* Make this triangle invisible. If it was already invisible, do nothing.
*/
public void makeInvisible()
{
erase();
isVisible = false;
}
/**
* Move the triangle a few pixels to the right.
*/
public void moveRight()
{
moveHorizontal(20);
}
/**
* Move the triangle a few pixels to the left.
*/
public void moveLeft()
{
moveHorizontal(-20);
}
/**
* Move the triangle a few pixels up.
*/
public void moveUp()
{
moveVertical(-20);
}
/**
* Move the triangle a few pixels down.
*/
public void moveDown()
{
moveVertical(20);
}
/**
* Move the triangle horizontally by 'distance' pixels.
*/
public void moveHorizontal(int distance)
{
erase();
xPosition += distance;
draw();
}
/**
* Move the triangle vertically by 'distance' pixels.
*/
public void moveVertical(int distance)
{
erase();
yPosition += distance;
draw();
}
/**
* Slowly move the triangle horizontally by 'distance' pixels.
*/
public void slowMoveHorizontal(int distance)
{
int delta;
if(distance < 0)
{
delta = -1;
distance = -distance;
}
else
{
delta = 1;
}
for(int i = 0; i < distance; i++)
{
xPosition += delta;
draw();
}
}
/**
* Slowly move the triangle vertically by 'distance' pixels.
*/
public void slowMoveVertical(int distance)
{
int delta;
if(distance < 0)
{
delta = -1;
distance = -distance;
}
else
{
delta = 1;
}
for(int i = 0; i < distance; i++)
{
yPosition += delta;
draw();
}
}
/**
* Change the size to the new size (in pixels). Size must be >= 0.
*/
public void changeSize(int newHeight, int newWidth)
{
erase();
height = newHeight;
width = newWidth;
draw();
}
/**
* Change the color. Valid colors are "red", "yellow", "blue", "green",
* "magenta" and "black".
*/
public void changeColor(String newColor)
{
color = newColor;
draw();
}
/*
* Draw the triangle with current specifications on screen.
*/
private void draw()
{
if(isVisible) {
Canvas canvas = Canvas.getCanvas();
int[] xpoints = { xPosition, xPosition + (width/2), xPosition - (width/2) };
int[] ypoints = { yPosition, yPosition + height, yPosition + height };
canvas.draw(this, color, new Polygon(xpoints, ypoints, 3));
canvas.wait(10);
}
}
/*
* Erase the triangle on screen.
*/
private void erase()
{
if(isVisible) {
Canvas canvas = Canvas.getCanvas();
canvas.erase(this);
}
}
}

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#BlueJ package file
dependency1.from=Square
dependency1.to=Canvas
dependency1.type=UsesDependency
dependency2.from=Triangle
dependency2.to=Canvas
dependency2.type=UsesDependency
dependency3.from=Circle
dependency3.to=Canvas
dependency3.type=UsesDependency
dependency4.from=Picture
dependency4.to=Square
dependency4.type=UsesDependency
dependency5.from=Picture
dependency5.to=Triangle
dependency5.type=UsesDependency
dependency6.from=Picture
dependency6.to=Circle
dependency6.type=UsesDependency
objectbench.height=76
objectbench.width=703
package.editor.height=268
package.editor.width=577
package.editor.x=20
package.editor.y=51
package.numDependencies=6
package.numTargets=5
package.showExtends=true
package.showUses=true
project.charset=UTF-8
target1.height=40
target1.name=Circle
target1.showInterface=false
target1.type=ClassTarget
target1.typeParameters=
target1.width=70
target1.x=110
target1.y=120
target2.height=40
target2.name=Picture
target2.showInterface=false
target2.type=ClassTarget
target2.typeParameters=
target2.width=70
target2.x=60
target2.y=20
target3.height=40
target3.name=Canvas
target3.showInterface=false
target3.type=ClassTarget
target3.typeParameters=
target3.width=70
target3.x=20
target3.y=180
target4.height=40
target4.name=Triangle
target4.showInterface=false
target4.type=ClassTarget
target4.typeParameters=
target4.width=70
target4.x=270
target4.y=60
target5.height=40
target5.name=Square
target5.showInterface=false
target5.type=ClassTarget
target5.typeParameters=
target5.width=70
target5.x=190
target5.y=90

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#BlueJ package file
dependency1.from=Square
dependency1.to=Canvas
dependency1.type=UsesDependency
dependency2.from=Triangle
dependency2.to=Canvas
dependency2.type=UsesDependency
dependency3.from=Circle
dependency3.to=Canvas
dependency3.type=UsesDependency
dependency4.from=Picture
dependency4.to=Square
dependency4.type=UsesDependency
dependency5.from=Picture
dependency5.to=Triangle
dependency5.type=UsesDependency
dependency6.from=Picture
dependency6.to=Circle
dependency6.type=UsesDependency
objectbench.height=76
objectbench.width=703
package.editor.height=268
package.editor.width=577
package.editor.x=20
package.editor.y=51
package.numDependencies=6
package.numTargets=5
package.showExtends=true
package.showUses=true
project.charset=UTF-8
target1.height=40
target1.name=Circle
target1.showInterface=false
target1.type=ClassTarget
target1.typeParameters=
target1.width=70
target1.x=110
target1.y=120
target2.height=40
target2.name=Picture
target2.showInterface=false
target2.type=ClassTarget
target2.typeParameters=
target2.width=70
target2.x=60
target2.y=20
target3.height=40
target3.name=Canvas
target3.showInterface=false
target3.type=ClassTarget
target3.typeParameters=
target3.width=70
target3.x=20
target3.y=180
target4.height=40
target4.name=Triangle
target4.showInterface=false
target4.type=ClassTarget
target4.typeParameters=
target4.width=70
target4.x=270
target4.y=60
target5.height=40
target5.name=Square
target5.showInterface=false
target5.type=ClassTarget
target5.typeParameters=
target5.width=70
target5.x=190
target5.y=90

122
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JLayer 1.0.1
JavaZOOM 1999-2008
Project Homepage :
http://www.javazoom.net/javalayer/javalayer.html
JAVA and MP3 online Forums :
http://www.javazoom.net/services/forums/index.jsp
-----------------------------------------------------
11/16/2008: JLayer 1.0.1
------------------------
- Subband allocation bug fix.
11/28/2004: JLayer 1.0
----------------------
- VBRI frame header (Fraunhofer VBR) support added in Header.java.
- Frame controls improved. It fixes the following bugs :
+ ArrayIndexOutOfBound Exception in t_43[] array.
+ ArrayIndexOutOfBound Exception in huffman_decode() method.
- Licensing moved from GPL to LGPL : It means that you can use JLayer in
your own application without being restricted by GPL license issues.
It's more business friendly.
- JavaLayer renamed into JLayer to be compliant to SUN trademark rules.
- Tested under JRE 1.5.0. CPU usage < 1%, RAM usage < 12MB under P4/2Ghz.
01/02/2004: JavaLayer 0.4
-------------------------
- XING VBR header frame support improved in Header.java :
+ public boolean vbr() added.
+ public int vbr_scale() added.
+ public byte[] vbr_toc() added.
total_ms(), ms_per_frame(), min_number_of_frames(int), max_number_of_frames(int),
bitrate_string(), bitrate() methods check for VBR status.
- ID3v2 frames support improved :
+ public InputStream getRawID3v2() added in Bitstream.java
- Misc :
Bug fixed in the decoder for some +320kbps stream.
Bug fixed : SYNC conflict with some ID3v2 frames.
+ public int bitrate() added.
+ public int bitrate_instant() added.
jUnit tests added (see srctest/ folder)
08/04/2003: JavaLayer 0.3.0
---------------------------
- Advanced threaded player classes added.
04/01/2002: JavaLayer 0.2.0
---------------------------
- MPEG 2.5 support added.
Encoded files with LAME are supported.
- Bug fixes for ms time computation with free format.
+ Bench notes :
+ Heap use range : 1380KB to 1900KB - 370 classes loaded.
+ Footprint : ~8MB under WinNT4 + J2SE 1.3 (Hotspot).
+ CPU usage : ~12% under PIII 800Mhz/WinNT4+J2SE 1.3 (Hotspot).
+ CPU usage : ~11% under PIII 1Ghz/Win2K+J2SE 1.4 (Hotspot).
03/04/2002: JavaLayer 0.1.2
---------------------------
- API improved to let developers get MP3 bitrate, framelength and total time features.
- Additionnal files added (CHANGES.txt and LICENSE.txt).
10/01/2001: JavaLayer 0.1.1
---------------------------
- Bugs fixes in the decoder (Layer III).
07/02/2001: JavaLayer 0.1.0
---------------------------
- Streaming support added to the simple player (jlp).
- Bugs fixes in the simple player (too fast playback for low rate files).
06/04/2001: JavaLayer 0.0.9
---------------------------
- Bugs fixes in Layer I and Layer II decoder.
- ANT build script added.
- HTML page added to play MP3 through PlayerApplet in a JavaSound 1.0 (JDK 1.3)
compliant browser.
04/16/2000: JavaLayer 0.0.8
---------------------------
A simple player have been added and you can now play MP3 in real time with JVM
that supports JavaSound 1.0 (i.e JDK 1.3).
- Bug fixes.
- Decoder improvements.
- Build Scripts have been added for Win32 and Unix platforms.
12/16/1999: JavaLayer 0.0.7
---------------------------
JavaLayer 0.0.7 contains significant improvements over version 0.0 :
- API and documentation added.
- The decoder is much more faster. Fast enough for real-time decoding.
- Huffman/Layer3 tables serialization added.
- New buffers management.
- Exceptions + Utils added.
- Bugs fixes.
02/28/1999: JavaLayer 0.0
-------------------------
JavaLayer V0.0 does not play any MP3 but it allows the MP3toWAV conversion.
This is the first step in this project. We do it thanks to free mp3 ressources
available on the net:
- MAPlay for the OO MP3 decoder (C++).
- WAV format description from Microsoft.
The MP3 decoder works now but it is too slow to allow real time implementation.

504
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JLayer 1.0.1
JavaZOOM 1999-2008
Project Homepage :
http://www.javazoom.net/javalayer/javalayer.html
JAVA and MP3 online Forums :
http://www.javazoom.net/services/forums/index.jsp
-----------------------------------------------------
DESCRIPTION :
-----------
JLayer is a library that decodes/plays/converts MPEG 1/2/2.5 Layer 1/2/3
(i.e. MP3) in real time for the JAVA(tm) platform. This is a non-commercial project
and anyone can add his contribution. JLayer is licensed under LGPL (see LICENSE.txt).
FAQ :
---
- How to install JLayer ?
Before running JLayer you must set PATH and CLASSPATH for JAVA
and you must add jl1.0.1.jar to the CLASSPATH.
- Do I need JMF to run JLayer player ?
No, JMF is not required. You just need a JVM JavaSound 1.0 compliant.
(i.e. JVM1.3 or higher).
- How to run the MP3TOWAV converter ?
java javazoom.jl.converter.jlc -v -p output.wav yourfile.mp3
(Note : MP3TOWAV converter should work under jdk1.1.x or higher)
- How to run the simple MP3 player ?
java javazoom.jl.player.jlp localfile.mp3
or
java javazoom.jl.player.jlp -url http://www.aserver.com/remotefile.mp3
Note : MP3 simple player only works under JVM that supports JavaSound 1.0 (i.e JDK1.3.x+)
- How to run the advanced (threaded) MP3 player ?
java javazoom.jl.player.advanced.jlap localfile.mp3
- Does simple MP3 player support streaming ?
Yes, use the following command to play music from stream :
java javazoom.jl.player.jlp -url http://www.shoutcastserver.com:8000
(If JLayer returns without playing SHOUTcast stream then it might mean
that the server expect a winamp like "User-Agent" in HTTP request).
- Does JLayer support MPEG 2.5 ?
Yes, it works fine for all files generated with LAME.
- Does JLayer support VBR ?
Yes, It supports VBRI and XING VBR header too.
- How to get ID3v1 or ID3v2 tags from JLayer API ?
The API provides a getRawID3v2() method to get an InputStream on ID3v2 frames.
- How to skip frames to have a seek feature ?
See javazoom.jl.player.advanced.jlap source to learn how to skip frames.
- How much memory/CPU JLayer needs to run ?
Here are our benchmark notes :
- Heap use range : 1380KB to 1900KB - 370 classes loaded.
- Footprint : ~8MB under WinNT4/Win2K + J2SE 1.3 (Hotspot).
~10MB under WinNT4/Win2K + J2SE 1.4.1 (Hotspot).
- CPU usage : ~12% under PIII 800Mhz/WinNT4+J2SE 1.3 (Hotspot).
~8% under PIII 1Ghz/Win2K+J2SE 1.3.1 (Hotspot).
~12% under PIII 1Ghz/Win2K+J2SE 1.4.1 (Hotspot).
~1% under PIII 1Ghz/Win2K+J2SE 1.5.0 (Hotspot).
- How to contact JLayer developers ?
Try to post a thread on Java&MP3 online forums at :
http://www.javazoom.net/services/forums/index.jsp
You can also contact us at jlayer@javazoom.net for contributions.
KNOWN PROBLEMS :
--------------
99% of MP3 plays well with JLayer but some (1%) return an ArrayIndexOutOfBoundsException
while playing. It might come from invalid audio frames.
Workaround : Just try/catch ArrayIndexOutOfBoundsException in your code to skip
non-detected invalid frames.

41
Semester 1/Programming 1/Java/examples/projects/JLayer1.0.1/build-unix.sh Executable file
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#!/bin/sh
#######################################################
# JLayer 1.0.1 Un*x Build Script
#
# Project Homepage :
# http://www.javazoom.net/javalayer/javalayer.html
#
# Java and MP3 online Forums :
# http://www.javazoom.net/services/forums/index.jsp
#
#######################################################
# JAVA_HOME and JL must be set below
#JAVA_HOME=/usr/local/java/jdk1.3.1
#JL=/home/javazoom/JLayer1.0.1
JL=../JLayer1.0.1
#---------------------------
# Do not modify lines below
#---------------------------
#CLASSPATH=$JAVA_HOME/lib/tools.jar
CLASSPATH=
#PATH=$PATH:$JAVA_HOME/bin
JLDECODERSRC=$JL/src/javazoom/jl/decoder
JLCONVERTERSRC=$JL/src/javazoom/jl/converter
JLSIMPLEPLAYER=$JL/src/javazoom/jl/player
JLADVPLAYER=$JL/src/javazoom/jl/player/advanced
echo javac -classpath $CLASSPATH:$JL/classes -d $JL/classes $JLDECODERSRC/*.java
javac -Xlint:unchecked -deprecation -classpath $JL/classes -d $JL/classes $JLDECODERSRC/*.java
echo javac -classpath $CLASSPATH:$JL/classes -d $JL/classes $JLCONVERTERSRC/*.java
javac -Xlint:unchecked -deprecation -classpath $JL/classes -d $JL/classes $JLCONVERTERSRC/*.java
(cd $JLDECODERSRC; cp *.ser $JL/classes/javazoom/jl/decoder)
# MP3 Simple + Advanced Player support :
#
# Comment both lines below for JDK1.1.x or JDK 1.2.x
javac -Xlint:unchecked -deprecation -classpath $JL/classes -d $JL/classes $JLSIMPLEPLAYER/*.java
javac -Xlint:unchecked -deprecation -classpath $JL/classes -d $JL/classes $JLADVPLAYER/*.java
# Jar Generation
(cd classes; jar cvf ../jl1.0.1.jar *)

42
Semester 1/Programming 1/Java/examples/projects/JLayer1.0.1/build-win32.bat Executable file
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rem #######################################################
rem # JLayer 1.0.1 WIN32 Build Script
rem #
rem # Project Homepage :
rem # http://www.javazoom.net/javalayer/javalayer.html
rem #
rem # Java and MP3 online Forums :
rem # http://www.javazoom.net/services/forums/index.jsp
rem #
rem #######################################################
rem # JAVA_HOME and JL must be set below
set JAVA_HOME=
set JL=../JLayer1.0.1
rem #---------------------------
rem # Do not modify lines below
rem #---------------------------
set CLASSPATH=.
set PATH=%PATH%;%JAVA_HOME%/bin
set JLDECODERSRC=%JL%/src/javazoom/jl/decoder
set JLCONVERTERSRC=%JL%/src/javazoom/jl/converter
set JLSIMPLEPLAYER=%JL%/src/javazoom/jl/player
set JLADVPLAYER=%JL%/src/javazoom/jl/player/advanced
javac -classpath %CLASSPATH%;%JL%/classes -d %JL%/classes %JLDECODERSRC%/*.java
javac -classpath %CLASSPATH%;%JL%/classes -d %JL%/classes %JLCONVERTERSRC%/*.java
cd %JLDECODERSRC%
copy *.ser %JL%/classes/javazoom/jl/decoder
rem # MP3 Simple + Advanced Player support :
rem #
rem # Comment both lines below for JDK1.1.x or JDK 1.2.x
cd %JLSIMPLEPLAYER%
javac -classpath %JL%/classes -d %JL%/classes *.java
cd %JLADVPLAYER%
javac -classpath %JL%/classes -d %JL%/classes *.java
rem # JAR Generation
cd classes
jar cvf ../jl1.0.1.jar *
cd %JL%

58
Semester 1/Programming 1/Java/examples/projects/JLayer1.0.1/build.xml Executable file
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<project name="javalayer" default="usage" basedir=".">
<!-- Initializations -->
<target name="init">
<echo message="-------------------------------------------------------------"/>
<echo message="------------ BUILDING JLAYER PACKAGE ----------"/>
<echo message=""/>
<property name="year" value="1999-2008"/>
<property name="jars" value="${basedir}"/>
<property name="sources" value="${basedir}/src"/>
<property name="classes" value="${basedir}/classes"/>
<property name="api" value="${basedir}/doc"/>
</target>
<!-- Build -->
<target name="build" depends="init">
<echo message="------ Compiling application"/>
<javac srcdir="${sources}" destdir="${classes}" includes="**"/>
<copy todir="${classes}">
<fileset dir="${sources}" >
<include name="javazoom/jl/decoder/*.ser"/>
</fileset>
</copy>
</target>
<!-- Archive -->
<target name="dist" depends="build">
<echo message="------ Building Jar file"/>
<jar jarfile="${jars}/jl1.0.1.jar" basedir="${classes}" />
</target>
<!-- JavaDoc -->
<target name="all" depends="dist">
<echo message="------ Running JavaDoc"/>
<javadoc packagenames="javazoom.*"
sourcepath="${sources}"
destdir="${api}"
bottom="JavaZOOM ${year}"
author="false">
<classpath>
<pathelement location="${classes}"/>
</classpath>
</javadoc>
</target>
<!-- Usage -->
<target name="usage">
<echo message="*** JavaLayer ANT build script ***"/>
<echo message="Usage : "/>
<echo message=" ant [target]"/>
<echo message=""/>
<echo message=" target : "/>
<echo message=" build : Build Application"/>
<echo message=" dist : Build Application + Archive (JAR)"/>
<echo message=" all : Build Application + Archive + JavaDoc"/>
</target>
</project>

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