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32
Semester 1/Programming 1/Java/examples/projects/chapter09/calculator-gui/CalcEngine.ctxt Executable file
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#BlueJ class context
comment0.params=
comment0.target=CalcEngine()
comment0.text=\n\ Create\ a\ CalcEngine.\n
comment1.params=
comment1.target=int\ getDisplayValue()
comment1.text=\n\ @return\ The\ value\ that\ should\ currently\ be\ displayed\n\ on\ the\ calculator\ display.\n
comment2.params=number
comment2.target=void\ numberPressed(int)
comment2.text=\n\ A\ number\ button\ was\ pressed.\n\ Either\ start\ a\ new\ operand,\ or\ incorporate\ this\ number\ as\n\ the\ least\ significant\ digit\ of\ an\ existing\ one.\n\ @param\ number\ The\ number\ pressed\ on\ the\ calculator.\n
comment3.params=
comment3.target=void\ plus()
comment3.text=\n\ The\ 'plus'\ button\ was\ pressed.\ \n
comment4.params=
comment4.target=void\ minus()
comment4.text=\n\ The\ 'minus'\ button\ was\ pressed.\n
comment5.params=
comment5.target=void\ equals()
comment5.text=\n\ The\ '\='\ button\ was\ pressed.\n
comment6.params=
comment6.target=void\ clear()
comment6.text=\n\ The\ 'C'\ (clear)\ button\ was\ pressed.\n
comment7.params=
comment7.target=java.lang.String\ getTitle()
comment7.text=\n\ @return\ The\ title\ of\ this\ calculation\ engine.\n
comment8.params=
comment8.target=java.lang.String\ getAuthor()
comment8.text=\n\ @return\ The\ author\ of\ this\ engine.\ This\ string\ is\ displayed\ as\ it\ is,\n\ so\ it\ should\ say\ something\ like\ "Written\ by\ H.\ Simpson".\n
comment9.params=
comment9.target=java.lang.String\ getVersion()
comment9.text=\n\ @return\ The\ version\ number\ of\ this\ engine.\ This\ string\ is\ displayed\ as\ \n\ it\ is,\ so\ it\ should\ say\ something\ like\ "Version\ 1.1".\n
numComments=10

90
Semester 1/Programming 1/Java/examples/projects/chapter09/calculator-gui/CalcEngine.java Executable file
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/**
* The main part of the calculator doing the calculations.
*
* @author: (none yet)
* @version 0.1 (incomplete)
*/
public class CalcEngine
{
// Put instance variables here.
/**
* Create a CalcEngine.
*/
public CalcEngine()
{
}
/**
* @return The value that should currently be displayed
* on the calculator display.
*/
public int getDisplayValue()
{
return 0;
}
/**
* A number button was pressed.
* Either start a new operand, or incorporate this number as
* the least significant digit of an existing one.
* @param number The number pressed on the calculator.
*/
public void numberPressed(int number)
{
}
/**
* The 'plus' button was pressed.
*/
public void plus()
{
}
/**
* The 'minus' button was pressed.
*/
public void minus()
{
}
/**
* The '=' button was pressed.
*/
public void equals()
{
}
/**
* The 'C' (clear) button was pressed.
*/
public void clear()
{
}
/**
* @return The title of this calculation engine.
*/
public String getTitle()
{
return "";
}
/**
* @return The author of this engine. This string is displayed as it is,
* so it should say something like "Written by H. Simpson".
*/
public String getAuthor()
{
return "";
}
/**
* @return The version number of this engine. This string is displayed as
* it is, so it should say something like "Version 1.1".
*/
public String getVersion()
{
return "";
}
}

8
Semester 1/Programming 1/Java/examples/projects/chapter09/calculator-gui/Calculator.ctxt Executable file
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#BlueJ class context
comment0.params=
comment0.target=Calculator()
comment0.text=\n\ Create\ a\ new\ calculator\ and\ show\ it.\n
comment1.params=
comment1.target=void\ show()
comment1.text=\n\ In\ case\ the\ window\ was\ closed,\ show\ it\ again.\n
numComments=2

30
Semester 1/Programming 1/Java/examples/projects/chapter09/calculator-gui/Calculator.java Executable file
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/**
* The main class of a simple calculator. Create one of these and you'll
* get the calculator on screen.
*
* @author: Michael Kölling and David J. Barnes
* @version 2016.02.29
*/
public class Calculator
{
private CalcEngine engine;
private UserInterface gui;
/**
* Create a new calculator and show it.
*/
public Calculator()
{
engine = new CalcEngine();
gui = new UserInterface(engine);
}
/**
* In case the window was closed, show it again.
*/
public void show()
{
gui.setVisible(true);
}
}

21
Semester 1/Programming 1/Java/examples/projects/chapter09/calculator-gui/README.TXT Executable file
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Project: calculator-gui
Authors: Michael Kölling 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 Kölling
Pearson Education, 2016
This program is meant to implement a simple pocket calculator.
In its initial version, it is incomplete.
The Calculator and UserInterface classes can be used as they are, but the
CalcEngine, the bit that does the real calculations, has not been implemented.
It is your task to finish the job. Have fun!
To start this application (once you have implemented the missing bits) just
create an object of class Calculator.

23
Semester 1/Programming 1/Java/examples/projects/chapter09/calculator-gui/UserInterface.ctxt Executable file
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#BlueJ class context
comment0.params=engine
comment0.target=UserInterface(CalcEngine)
comment0.text=\n\ Create\ a\ user\ interface.\n\ @param\ engine\ The\ calculator\ engine.\n
comment1.params=visible
comment1.target=void\ setVisible(boolean)
comment1.text=\n\ Set\ the\ visibility\ of\ the\ interface.\n\ @param\ visible\ true\ if\ the\ interface\ is\ to\ be\ made\ visible,\ false\ otherwise.\n
comment2.params=
comment2.target=void\ makeFrame()
comment2.text=\n\ Make\ the\ frame\ for\ the\ user\ interface.\n
comment3.params=panel\ buttonText\ action
comment3.target=void\ addButton(java.awt.Container,\ java.lang.String,\ UserInterface.ButtonAction)
comment3.text=\n\ Add\ a\ button\ to\ the\ button\ panel.\n\ @param\ panel\ The\ panel\ to\ receive\ the\ button.\n\ @param\ buttonText\ The\ text\ for\ the\ button.\n\ @param\ action\ Action\ to\ be\ taken\ by\ the\ button.\n
comment4.params=panel\ digit
comment4.target=void\ addNumberButton(java.awt.Container,\ int)
comment4.text=\n\ Add\ a\ number\ button\ to\ the\ button\ panel.\n\ @param\ panel\ The\ panel\ to\ receive\ the\ button.\n\ @param\ digit\ The\ single\ digit\ on\ the\ button.\n
comment5.params=
comment5.target=void\ redisplay()
comment5.text=\n\ Update\ the\ interface\ display\ to\ show\ the\ current\ value\ of\ the\ \n\ calculator.\n
comment6.params=
comment6.target=void\ showInfo()
comment6.text=\n\ Toggle\ the\ info\ display\ in\ the\ calculator's\ status\ area\ between\ the\n\ author\ and\ version\ information.\n
numComments=7

144
Semester 1/Programming 1/Java/examples/projects/chapter09/calculator-gui/UserInterface.java Executable file
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import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;
/**
* A graphical user interface for the calculator. No calculation is being
* done here. This class is responsible just for putting up the display on
* screen. It then refers to the "CalcEngine" to do all the real work.
*
* @author: Michael Kölling and David J. Barnes
* @version 2016.02.29
*/
public class UserInterface
{
private CalcEngine calc;
private boolean showingAuthor;
private JFrame frame;
private JTextField display;
private JLabel status;
/**
* Create a user interface.
* @param engine The calculator engine.
*/
public UserInterface(CalcEngine engine)
{
calc = engine;
showingAuthor = true;
makeFrame();
frame.setVisible(true);
}
/**
* Set the visibility of the interface.
* @param visible true if the interface is to be made visible, false otherwise.
*/
public void setVisible(boolean visible)
{
frame.setVisible(visible);
}
/**
* Make the frame for the user interface.
*/
private void makeFrame()
{
frame = new JFrame(calc.getTitle());
JPanel contentPane = (JPanel)frame.getContentPane();
contentPane.setLayout(new BorderLayout(8, 8));
contentPane.setBorder(new EmptyBorder( 10, 10, 10, 10));
display = new JTextField();
contentPane.add(display, BorderLayout.NORTH);
JPanel buttonPanel = new JPanel(new GridLayout(4, 4));
addNumberButton(buttonPanel, 7);
addNumberButton(buttonPanel, 8);
addNumberButton(buttonPanel, 9);
addButton(buttonPanel, "C", () -> calc.clear());
addNumberButton(buttonPanel, 4);
addNumberButton(buttonPanel, 5);
addNumberButton(buttonPanel, 6);
addButton(buttonPanel, "?", () -> showInfo());
addNumberButton(buttonPanel, 1);
addNumberButton(buttonPanel, 2);
addNumberButton(buttonPanel, 3);
buttonPanel.add(new JLabel(" "));
addNumberButton(buttonPanel, 0);
addButton(buttonPanel, "+", () -> calc.plus());
addButton(buttonPanel, "-", () -> calc.minus());
addButton(buttonPanel, "=", () -> calc.equals());
contentPane.add(buttonPanel, BorderLayout.CENTER);
status = new JLabel(calc.getAuthor());
contentPane.add(status, BorderLayout.SOUTH);
frame.pack();
}
/**
* Add a button to the button panel.
* @param panel The panel to receive the button.
* @param buttonText The text for the button.
* @param action Action to be taken by the button.
*/
private void addButton(Container panel, String buttonText, ButtonAction action)
{
JButton button = new JButton(buttonText);
button.addActionListener(e -> { action.act(); redisplay(); });
panel.add(button);
}
/**
* Add a number button to the button panel.
* @param panel The panel to receive the button.
* @param digit The single digit on the button.
*/
private void addNumberButton(Container panel, int digit)
{
addButton(panel, "" + digit, () -> calc.numberPressed(digit));
}
/**
* Update the interface display to show the current value of the
* calculator.
*/
private void redisplay()
{
display.setText("" + calc.getDisplayValue());
}
/**
* Toggle the info display in the calculator's status area between the
* author and version information.
*/
private void showInfo()
{
if(showingAuthor)
status.setText(calc.getVersion());
else
status.setText(calc.getAuthor());
showingAuthor = !showingAuthor;
}
/**
* Functional interface for button actions.
*/
@FunctionalInterface
private interface ButtonAction
{
/**
* Act on a button press.
*/
public void act();
}
}

64
Semester 1/Programming 1/Java/examples/projects/chapter09/calculator-gui/package.bluej Executable file
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#BlueJ package file
dependency1.from=UserInterface
dependency1.to=CalcEngine
dependency1.type=UsesDependency
dependency2.from=Calculator
dependency2.to=CalcEngine
dependency2.type=UsesDependency
dependency3.from=Calculator
dependency3.to=UserInterface
dependency3.type=UsesDependency
objectbench.height=76
objectbench.width=760
package.editor.height=435
package.editor.width=652
package.editor.x=70
package.editor.y=80
package.numDependencies=3
package.numTargets=3
package.showExtends=true
package.showUses=true
project.charset=UTF-8
readme.editor.height=602
readme.editor.width=814
readme.editor.x=41
readme.editor.y=23
target1.editor.height=735
target1.editor.width=843
target1.editor.x=50
target1.editor.y=60
target1.height=60
target1.name=Calculator
target1.naviview.expanded=true
target1.showInterface=false
target1.type=ClassTarget
target1.typeParameters=
target1.width=100
target1.x=80
target1.y=70
target2.editor.height=696
target2.editor.width=822
target2.editor.x=99
target2.editor.y=49
target2.height=60
target2.name=UserInterface
target2.naviview.expanded=false
target2.showInterface=false
target2.type=ClassTarget
target2.typeParameters=
target2.width=120
target2.x=240
target2.y=150
target3.editor.height=721
target3.editor.width=870
target3.editor.x=50
target3.editor.y=60
target3.height=60
target3.name=CalcEngine
target3.naviview.expanded=true
target3.showInterface=false
target3.type=ClassTarget
target3.typeParameters=
target3.width=120
target3.x=430
target3.y=230