Define a toString method in Post and override it in EventPost. EventPost Class: /** * This...
Define a toString method in Post and override it in EventPost.
EventPost Class:
/**
* This class stores information about a post in a social network
news feed.
* The main part of the post consists of events.
* Other data, such as author and type of event, are also
stored.
*
* @author Matthieu Bourbeau
* @version (1.0) March 12, 2020
*/
public class EventPost extends Post
{
// instance variables - replace the example below with your
own
private String eventType;
/**
* Constructor for objects of class EventPost
*/
public EventPost(String author, String typeOfEvent)
{
super(author);
this.eventType = typeOfEvent;
}
/**
* Sets the type of event.
*/
public void setEventType(String typeOfEvent)
{
this.eventType = typeOfEvent;
}
/**
* Returns the type of event.
*/
public String getEventType()
{
return eventType;
}
}
Post Class:
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 0.2
*/
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* Record that a user has withdrawn his/her 'Like' vote.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";
}
}
}
Homework Answers
CODE:
EventPost.java
/**
* This class stores information about a post in a social network news feed. The
* main part of the post consists of events. Other data, such as author and type
* of event, are also stored.
*
* @author Matthieu Bourbeau
* @version (1.0) March 12, 2020
*/
public class EventPost extends Post {
// instance variables - replace the example below with your own
private String eventType;
/**
* Constructor for objects of class EventPost
*/
public EventPost(String author, String typeOfEvent) {
super(author);
this.eventType = typeOfEvent;
}
/**
* Sets the type of event.
*/
public void setEventType(String typeOfEvent) {
this.eventType = typeOfEvent;
}
/**
* Returns the type of event.
*/
public String getEventType() {
return eventType;
}
public String toString() {
return "Username: " + getUsername() + "\nTime stamp: " + getTimeStamp() + "\n Likes: " + getLikes()
+ "\nComments: " + getComments() + "Event Type: " + this.eventType;
}
}
Post.java
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 0.2
*/
public class Post {
private String username;
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";
}
}
// getter
public String getUsername() {
return this.username;
}
public int getLikes() {
return this.likes;
}
public ArrayList<String> getComments() {
return this.comments;
}
// username of the post's author
public String toString() {
return "Username: " + this.username + "\nTime stamp: " + this.timestamp + "\n Likes: " + this.likes
+ "\nComments: " + this.comments;
}
}
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Define a toString method in Post and override it in
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EventPost Class:
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