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11
Semester 1/Programming 1/Java/examples/projects/chapter11/network-v3/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=java.lang.String\ getText()
comment1.text=\n\ Return\ the\ text\ of\ this\ post.\n\ \n\ @return\ The\ post's\ message\ text.\n
comment2.params=
comment2.target=void\ display()
comment2.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
numComments=3

47
Semester 1/Programming 1/Java/examples/projects/chapter11/network-v3/MessagePost.java Executable file
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import java.util.ArrayList;
/**
* This class stores information about a post in a social network news feed.
* 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 0.3
*/
public class MessagePost extends Post
{
private String message; // an arbitrarily long, multi-line message
/**
* 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)
{
super(author);
message = text;
}
/**
* Return the text of this post.
*
* @return The post's message text.
*/
public String getText()
{
return message;
}
/**
* 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(message);
}
}

11
Semester 1/Programming 1/Java/examples/projects/chapter11/network-v3/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=post
comment1.target=void\ addPost(Post)
comment1.text=\n\ Add\ a\ post\ to\ the\ news\ feed.\n\ \n\ @param\ post\ \ The\ post\ to\ be\ added.\n
comment2.params=
comment2.target=void\ show()
comment2.text=\n\ Show\ the\ news\ feed.\ Currently\:\ print\ the\ news\ feed\ details\n\ to\ the\ terminal.\ (To\ do\:\ replace\ this\ later\ with\ display\n\ in\ web\ browser.)\n
numComments=3

49
Semester 1/Programming 1/Java/examples/projects/chapter11/network-v3/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 0.3
*/
public class NewsFeed
{
private ArrayList<Post> posts;
/**
* Construct an empty news feed.
*/
public NewsFeed()
{
posts = new ArrayList<>();
}
/**
* Add a post to the news feed.
*
* @param post The post to be added.
*/
public void addPost(Post post)
{
posts.add(post);
}
/**
* 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()
{
for(Post post : posts) {
post.display();
System.out.println(); // empty line between posts
}
}
}

14
Semester 1/Programming 1/Java/examples/projects/chapter11/network-v3/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=java.lang.String\ getImageFile()
comment1.text=\n\ Return\ the\ file\ name\ of\ the\ image\ in\ this\ post.\n\ \n\ @return\ The\ post's\ image\ file\ name.\n
comment2.params=
comment2.target=java.lang.String\ getCaption()
comment2.text=\n\ Return\ the\ caption\ of\ the\ image\ of\ this\ post.\n\ \n\ @return\ The\ image's\ caption.\n
comment3.params=
comment3.target=void\ display()
comment3.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
numComments=4

61
Semester 1/Programming 1/Java/examples/projects/chapter11/network-v3/PhotoPost.java Executable file
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import java.util.ArrayList;
/**
* This class stores information about a post in a social network news feed.
* 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 0.3
*/
public class PhotoPost extends Post
{
private String filename; // the name of the image file
private String caption; // a one line image caption
/**
* 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)
{
super(author);
this.filename = filename;
this.caption = caption;
}
/**
* 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;
}
/**
* 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(" [" + filename + "]");
System.out.println(" " + caption);
}
}

23
Semester 1/Programming 1/Java/examples/projects/chapter11/network-v3/Post.ctxt Executable file
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#BlueJ class context
comment0.params=author
comment0.target=Post(java.lang.String)
comment0.text=\n\ Constructor\ for\ objects\ of\ class\ Post.\n\ \n\ @param\ author\ \ \ \ The\ username\ of\ the\ author\ 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=long\ getTimeStamp()
comment4.text=\n\ Return\ the\ time\ of\ creation\ of\ this\ post.\n\ \n\ @return\ The\ post's\ creation\ time,\ as\ a\ system\ time\ value.\n
comment5.params=
comment5.target=void\ display()
comment5.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
comment6.params=time
comment6.target=java.lang.String\ timeString(long)
comment6.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=7

117
Semester 1/Programming 1/Java/examples/projects/chapter11/network-v3/Post.java Executable file
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import java.util.ArrayList;
/**
* This class stores information about a news feed post in a
* social network. Posts can be stored and displayed. This class
* serves as a superclass for more specific post types.
*
* @author Michael Kölling and David J. Barnes
* @version 0.3
*/
public class Post
{
private String username; // username of the post's author
private long timestamp;
private int likes;
private ArrayList<String> comments;
/**
* Constructor for objects of class Post.
*
* @param author The username of the author of this post.
*/
public Post(String author)
{
username = author;
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 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.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/chapter11/network-v3/README.TXT Executable file
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Project: network-v3
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
This is a third version of a news feed for a social network.

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Semester 1/Programming 1/Java/examples/projects/chapter11/network-v3/package.bluej Executable file
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#BlueJ package file
dependency1.from=NewsFeed
dependency1.to=Post
dependency1.type=UsesDependency
objectbench.height=76
objectbench.width=829
package.editor.height=462
package.editor.width=721
package.editor.x=70
package.editor.y=80
package.numDependencies=1
package.numTargets=4
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=730
target1.editor.width=876
target1.editor.x=88
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=90
target2.editor.height=749
target2.editor.width=944
target2.editor.x=53
target2.editor.y=23
target2.height=60
target2.name=Post
target2.naviview.expanded=true
target2.showInterface=false
target2.type=ClassTarget
target2.typeParameters=
target2.width=110
target2.x=350
target2.y=170
target3.editor.height=729
target3.editor.width=867
target3.editor.x=98
target3.editor.y=70
target3.height=60
target3.name=PhotoPost
target3.naviview.expanded=true
target3.showInterface=false
target3.type=ClassTarget
target3.typeParameters=
target3.width=110
target3.x=440
target3.y=290
target4.editor.height=737
target4.editor.width=980
target4.editor.x=53
target4.editor.y=66
target4.height=60
target4.name=MessagePost
target4.naviview.expanded=true
target4.showInterface=false
target4.type=ClassTarget
target4.typeParameters=
target4.width=110
target4.x=280
target4.y=290