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26
Semester 1/Programming 1/Java/examples/projects/chapter10/network-v1/MessagePost.ctxt Executable file
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#BlueJ class context
comment0.params=author\ text
comment0.target=MessagePost(java.lang.String,\ java.lang.String)
comment0.text=\n\ Constructor\ for\ objects\ of\ class\ MessagePost.\n\ \n\ @param\ author\ \ \ \ The\ username\ of\ the\ author\ of\ this\ post.\n\ @param\ text\ \ \ \ \ \ The\ text\ of\ this\ post.\n
comment1.params=
comment1.target=void\ like()
comment1.text=\n\ Record\ one\ more\ 'Like'\ indication\ from\ a\ user.\n
comment2.params=
comment2.target=void\ unlike()
comment2.text=\n\ Record\ that\ a\ user\ has\ withdrawn\ his/her\ 'Like'\ vote.\n
comment3.params=text
comment3.target=void\ addComment(java.lang.String)
comment3.text=\n\ Add\ a\ comment\ to\ this\ post.\n\ \n\ @param\ text\ \ The\ new\ comment\ to\ add.\n
comment4.params=
comment4.target=java.lang.String\ getText()
comment4.text=\n\ Return\ the\ text\ of\ this\ post.\n\ \n\ @return\ The\ post's\ text.\n
comment5.params=
comment5.target=long\ getTimeStamp()
comment5.text=\n\ Return\ the\ time\ of\ creation\ of\ this\ post.\n\ \n\ @return\ The\ post's\ creation\ time,\ as\ a\ system\ time\ value.\n
comment6.params=
comment6.target=void\ display()
comment6.text=\n\ Display\ the\ details\ of\ this\ post.\n\ \n\ (Currently\:\ Print\ to\ the\ text\ terminal.\ This\ is\ simulating\ display\ \n\ in\ a\ web\ browser\ for\ now.)\n
comment7.params=time
comment7.target=java.lang.String\ timeString(long)
comment7.text=\n\ Create\ a\ string\ describing\ a\ time\ point\ in\ the\ past\ in\ terms\ \n\ relative\ to\ current\ time,\ such\ as\ "30\ seconds\ ago"\ or\ "7\ minutes\ ago".\n\ Currently,\ only\ seconds\ and\ minutes\ are\ used\ for\ the\ string.\n\ \n\ @param\ time\ \ The\ time\ value\ to\ convert\ (in\ system\ milliseconds)\n\ @return\ \ \ \ \ \ A\ relative\ time\ string\ for\ the\ given\ time\n
numComments=8

131
Semester 1/Programming 1/Java/examples/projects/chapter10/network-v1/MessagePost.java Executable file
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import java.util.ArrayList;
/**
* This class stores information about a post in a social network.
* The main part of the post consists of a (possibly multi-line)
* text message. Other data, such as author and time, are also stored.
*
* @author Michael Kölling and David J. Barnes
* @version 0.1
*/
public class MessagePost
{
private String username; // username of the post's author
private String message; // an arbitrarily long, multi-line message
private long timestamp;
private int likes;
private ArrayList<String> comments;
/**
* Constructor for objects of class MessagePost.
*
* @param author The username of the author of this post.
* @param text The text of this post.
*/
public MessagePost(String author, String text)
{
username = author;
message = text;
timestamp = System.currentTimeMillis();
likes = 0;
comments = new ArrayList<>();
}
/**
* Record one more 'Like' indication from a user.
*/
public void like()
{
likes++;
}
/**
* Record that a user has withdrawn his/her 'Like' vote.
*/
public void unlike()
{
if (likes > 0) {
likes--;
}
}
/**
* Add a comment to this post.
*
* @param text The new comment to add.
*/
public void addComment(String text)
{
comments.add(text);
}
/**
* Return the text of this post.
*
* @return The post's text.
*/
public String getText()
{
return message;
}
/**
* Return the time of creation of this post.
*
* @return The post's creation time, as a system time value.
*/
public long getTimeStamp()
{
return timestamp;
}
/**
* Display the details of this post.
*
* (Currently: Print to the text terminal. This is simulating display
* in a web browser for now.)
*/
public void display()
{
System.out.println(username);
System.out.println(message);
System.out.print(timeString(timestamp));
if(likes > 0) {
System.out.println(" - " + likes + " people like this.");
}
else {
System.out.println();
}
if(comments.isEmpty()) {
System.out.println(" No comments.");
}
else {
System.out.println(" " + comments.size() + " comment(s). Click here to view.");
}
}
/**
* Create a string describing a time point in the past in terms
* relative to current time, such as "30 seconds ago" or "7 minutes ago".
* Currently, only seconds and minutes are used for the string.
*
* @param time The time value to convert (in system milliseconds)
* @return A relative time string for the given time
*/
private String timeString(long time)
{
long current = System.currentTimeMillis();
long pastMillis = current - time; // time passed in milliseconds
long seconds = pastMillis/1000;
long minutes = seconds/60;
if(minutes > 0) {
return minutes + " minutes ago";
}
else {
return seconds + " seconds ago";
}
}
}

14
Semester 1/Programming 1/Java/examples/projects/chapter10/network-v1/NewsFeed.ctxt Executable file
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#BlueJ class context
comment0.params=
comment0.target=NewsFeed()
comment0.text=\n\ Construct\ an\ empty\ news\ feed.\n
comment1.params=message
comment1.target=void\ addMessagePost(MessagePost)
comment1.text=\n\ Add\ a\ text\ post\ to\ the\ news\ feed.\n\ \n\ @param\ text\ \ The\ text\ post\ to\ be\ added.\n
comment2.params=photo
comment2.target=void\ addPhotoPost(PhotoPost)
comment2.text=\n\ Add\ a\ photo\ post\ to\ the\ news\ feed.\n\ \n\ @param\ photo\ \ The\ photo\ post\ to\ be\ added.\n
comment3.params=
comment3.target=void\ show()
comment3.text=\n\ Show\ the\ news\ feed.\ Currently\:\ print\ the\ news\ feed\ details\ to\ the\n\ terminal.\ (To\ do\:\ replace\ this\ later\ with\ display\ in\ web\ browser.)\n
numComments=4

68
Semester 1/Programming 1/Java/examples/projects/chapter10/network-v1/NewsFeed.java Executable file
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import java.util.ArrayList;
/**
* The NewsFeed class stores news posts for the news feed in a social network
* application.
*
* Display of the posts is currently simulated by printing the details to the
* terminal. (Later, this should display in a browser.)
*
* This version does not save the data to disk, and it does not provide any
* search or ordering functions.
*
* @author Michael Kölling and David J. Barnes
* @version 0.1
*/
public class NewsFeed
{
private ArrayList<MessagePost> messages;
private ArrayList<PhotoPost> photos;
/**
* Construct an empty news feed.
*/
public NewsFeed()
{
messages = new ArrayList<>();
photos = new ArrayList<>();
}
/**
* Add a text post to the news feed.
*
* @param text The text post to be added.
*/
public void addMessagePost(MessagePost message)
{
messages.add(message);
}
/**
* Add a photo post to the news feed.
*
* @param photo The photo post to be added.
*/
public void addPhotoPost(PhotoPost photo)
{
photos.add(photo);
}
/**
* Show the news feed. Currently: print the news feed details to the
* terminal. (To do: replace this later with display in web browser.)
*/
public void show()
{
// display all text posts
for(MessagePost message : messages) {
message.display();
System.out.println(); // empty line between posts
}
// display all photos
for(PhotoPost photo : photos) {
photo.display();
System.out.println(); // empty line between posts
}
}
}

29
Semester 1/Programming 1/Java/examples/projects/chapter10/network-v1/PhotoPost.ctxt Executable file
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#BlueJ class context
comment0.params=author\ filename\ caption
comment0.target=PhotoPost(java.lang.String,\ java.lang.String,\ java.lang.String)
comment0.text=\n\ Constructor\ for\ objects\ of\ class\ PhotoPost.\n\ \n\ @param\ author\ \ \ \ The\ username\ of\ the\ author\ of\ this\ post.\n\ @param\ filename\ \ The\ filename\ of\ the\ image\ in\ this\ post.\n\ @param\ caption\ \ \ A\ caption\ for\ the\ image.\n
comment1.params=
comment1.target=void\ like()
comment1.text=\n\ Record\ one\ more\ 'Like'\ indication\ from\ a\ user.\n
comment2.params=
comment2.target=void\ unlike()
comment2.text=\n\ Record\ that\ a\ user\ has\ withdrawn\ his/her\ 'Like'\ vote.\n
comment3.params=text
comment3.target=void\ addComment(java.lang.String)
comment3.text=\n\ Add\ a\ comment\ to\ this\ post.\n\ \n\ @param\ text\ \ The\ new\ comment\ to\ add.\n
comment4.params=
comment4.target=java.lang.String\ getImageFile()
comment4.text=\n\ Return\ the\ file\ name\ of\ the\ image\ in\ this\ post.\n\ \n\ @return\ The\ post's\ image\ file\ name.\n
comment5.params=
comment5.target=java.lang.String\ getCaption()
comment5.text=\n\ Return\ the\ caption\ of\ the\ image\ of\ this\ post.\n\ \n\ @return\ The\ image's\ caption.\n
comment6.params=
comment6.target=long\ getTimeStamp()
comment6.text=\n\ Return\ the\ time\ of\ creation\ of\ this\ post.\n\ \n\ @return\ The\ post's\ creation\ time,\ as\ a\ system\ time\ value.\n
comment7.params=
comment7.target=void\ display()
comment7.text=\n\ Display\ the\ details\ of\ this\ post.\n\ \n\ (Currently\:\ Print\ to\ the\ text\ terminal.\ This\ is\ simulating\ display\ \n\ in\ a\ web\ browser\ for\ now.)\n
comment8.params=time
comment8.target=java.lang.String\ timeString(long)
comment8.text=\n\ Create\ a\ string\ describing\ a\ time\ point\ in\ the\ past\ in\ terms\ \n\ relative\ to\ current\ time,\ such\ as\ "30\ seconds\ ago"\ or\ "7\ minutes\ ago".\n\ Currently,\ only\ seconds\ and\ minutes\ are\ used\ for\ the\ string.\n\ \n\ @param\ time\ \ The\ time\ value\ to\ convert\ (in\ system\ milliseconds)\n\ @return\ \ \ \ \ \ A\ relative\ time\ string\ for\ the\ given\ time\n
numComments=9

145
Semester 1/Programming 1/Java/examples/projects/chapter10/network-v1/PhotoPost.java Executable file
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import java.util.ArrayList;
/**
* This class stores information about a post in a social network.
* The main part of the post consists of a photo and a caption.
* Other data, such as author and time, are also stored.
*
* @author Michael Kölling and David J. Barnes
* @version 0.1
*/
public class PhotoPost
{
private String username; // username of the post's author
private String filename; // the name of the image file
private String caption; // a one line image caption
private long timestamp;
private int likes;
private ArrayList<String> comments;
/**
* Constructor for objects of class PhotoPost.
*
* @param author The username of the author of this post.
* @param filename The filename of the image in this post.
* @param caption A caption for the image.
*/
public PhotoPost(String author, String filename, String caption)
{
username = author;
this.filename = filename;
this.caption = caption;
timestamp = System.currentTimeMillis();
likes = 0;
comments = new ArrayList<>();
}
/**
* Record one more 'Like' indication from a user.
*/
public void like()
{
likes++;
}
/**
* Record that a user has withdrawn his/her 'Like' vote.
*/
public void unlike()
{
if (likes > 0) {
likes--;
}
}
/**
* Add a comment to this post.
*
* @param text The new comment to add.
*/
public void addComment(String text)
{
comments.add(text);
}
/**
* Return the file name of the image in this post.
*
* @return The post's image file name.
*/
public String getImageFile()
{
return filename;
}
/**
* Return the caption of the image of this post.
*
* @return The image's caption.
*/
public String getCaption()
{
return caption;
}
/**
* Return the time of creation of this post.
*
* @return The post's creation time, as a system time value.
*/
public long getTimeStamp()
{
return timestamp;
}
/**
* Display the details of this post.
*
* (Currently: Print to the text terminal. This is simulating display
* in a web browser for now.)
*/
public void display()
{
System.out.println(username);
System.out.println(" [" + filename + "]");
System.out.println(" " + caption);
System.out.print(timeString(timestamp));
if(likes > 0) {
System.out.println(" - " + likes + " people like this.");
}
else {
System.out.println();
}
if(comments.isEmpty()) {
System.out.println(" No comments.");
}
else {
System.out.println(" " + comments.size() + " comment(s). Click here to view.");
}
}
/**
* Create a string describing a time point in the past in terms
* relative to current time, such as "30 seconds ago" or "7 minutes ago".
* Currently, only seconds and minutes are used for the string.
*
* @param time The time value to convert (in system milliseconds)
* @return A relative time string for the given time
*/
private String timeString(long time)
{
long current = System.currentTimeMillis();
long pastMillis = current - time; // time passed in milliseconds
long seconds = pastMillis/1000;
long minutes = seconds/60;
if(minutes > 0) {
return minutes + " minutes ago";
}
else {
return seconds + " seconds ago";
}
}
}

11
Semester 1/Programming 1/Java/examples/projects/chapter10/network-v1/README.TXT Executable file
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Project: network-v1
Authors: Michael Kölling and David J. Barnes
This project is part of the material for chapter 8 of the book
Objects First with Java - A Practical Introduction using BlueJ
Sixth edition
David J. Barnes and Michael Kölling
Pearson Education, 2016
It implements a first version of a news feed for a social network.

61
Semester 1/Programming 1/Java/examples/projects/chapter10/network-v1/package.bluej Executable file
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#BlueJ package file
dependency1.from=NewsFeed
dependency1.to=PhotoPost
dependency1.type=UsesDependency
dependency2.from=NewsFeed
dependency2.to=MessagePost
dependency2.type=UsesDependency
objectbench.height=76
objectbench.width=798
package.editor.height=437
package.editor.width=690
package.editor.x=70
package.editor.y=80
package.numDependencies=2
package.numTargets=3
package.showExtends=true
package.showUses=true
project.charset=UTF-8
readme.editor.height=592
readme.editor.width=806
readme.editor.x=53
readme.editor.y=23
target1.editor.height=792
target1.editor.width=927
target1.editor.x=81
target1.editor.y=23
target1.height=60
target1.name=NewsFeed
target1.naviview.expanded=true
target1.showInterface=false
target1.type=ClassTarget
target1.typeParameters=
target1.width=100
target1.x=150
target1.y=100
target2.editor.height=753
target2.editor.width=940
target2.editor.x=59
target2.editor.y=22
target2.height=60
target2.name=PhotoPost
target2.naviview.expanded=true
target2.showInterface=false
target2.type=ClassTarget
target2.typeParameters=
target2.width=110
target2.x=370
target2.y=260
target3.editor.height=742
target3.editor.width=944
target3.editor.x=205
target3.editor.y=24
target3.height=60
target3.name=MessagePost
target3.naviview.expanded=true
target3.showInterface=false
target3.type=ClassTarget
target3.typeParameters=
target3.width=110
target3.x=370
target3.y=190