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Java Java Objects (Retired) Delivering the MVP Wrapping up

Posted by micheala leaver
micheala leaver
1,313 Points

Finally, uncomment the addPost method in Forum.java. Then for the last task, uncomment the main method in Example.java

I tried thin but it still didnt work can someone please help?

ForumPost.java 
public class ForumPost {
  private User mAuthor;
  private String mTitle;
  private String mDescription;

   public ForumPost(User author, String title, String description) {
    mAuthor = author;
    mTitle = title;
    mDescription = description;
  }

  public User getAuthor() {
    return mAuthor;
  }

  public String getTitle() {
    return mTitle;
  }

  // TODO: We need to expose the description
   public String getDescription() {
    return mDescription;
  }
}
User.java 
public class User {

  private String mFirstName;
  private String mLastName;

  public User(String firstName, String lastName) {
    // TODO:  Set the private fields here
     mFirstName = firstName;
    mLastName = lastName;
  }
  public String getFirstName() {
    return mFirstName;
  }



   public String getLastName() {
   return mLastName;
  }
}
Forum.java 
public class Forum {
  private String mTopic;

   public Forum(String topic) {
    mTopic = topic;
  }

  public String getTopic() {
      return mTopic;
  }

  public void addPost(ForumPost post) {
    *   When all is ready uncomment this...
      System.out.printf("New post from %s %s about %s.\n",
                         post.getAuthor().getFirstName(),
                         post.getAuthor().getLastName(),
                         post.getTitle());
     *
  }
}
Example.java 
public class Example {

  public static void main(String[] args) {
    System.out.println("Starting forum example...");
    if (args.length < 2) {
       System.out.println("first and last name are required. eg:  java Example Craig Dennis");
    }
     Forum forum = new Forum("Java");
    // Take the first two elements passed args
     User author = new User();
    // Add the author, title and description
     ForumPost post = new ForumPost();
     forum.addPost(post);
  }
}

3 Answers

Jeremy Hill
Jeremy Hill
29,567 Points

There is a comment line that didn't get fully removed in class Forum and in the line that instantiates the user in class Example you need to add args like this:

User author = new User(args[0], args[1]);

This is necessary for the user to be able to input their name from the command line for the program to use.

micheala leaver
micheala leaver
1,313 Points

I did that and it still says ./Example.java:12: error: cannot find symbol ForumPost post = new Forumpost(); ^ symbol: class Forumpost location: class Example 1 error

Jeremy Hill
Jeremy Hill
29,567 Points
Jeremy Hill
Jeremy Hill
29,567 Points

This is because you have to provide arguments, it is expecting three: author, "Some Text (title)", "Some more text (description)" Like this:

ForumPost post = new ForumPost(author, "Treehouse", "Treehouse is the best!!!");

Try this and see if this helps. If it doesn't then I will add my code which passed the challenge.

micheala leaver
micheala leaver
1,313 Points

Dang it! Nope it still didn't work. sorry.

Jeremy Hill
Jeremy Hill
29,567 Points
Jeremy Hill
Jeremy Hill
29,567 Points

I will post my code and you can compare:

public class ForumPost {
  private User mAuthor;
  private String mTitle;
  private String mDescription;

  public ForumPost(User author, String title, String description){
    mAuthor = author;
    mTitle = title;
    mDescription = description;

  }
  public User getAuthor() {
    return mAuthor;
  }

  public String getTitle() {
    return mTitle;
  }
  public String getDescription(){
   return mDescription; 
  }

  // TODO: We need to expose the description
}

public class User {

  private String mFirstName;
  private String mLastName;



  public User(String firstName, String lastName) {
    // TODO:  Set the private fields here
    mFirstName = firstName;
    mLastName = lastName;
  }

  public String getFirstName(){
   return mFirstName; 
  }
  public String getLastName(){
   return mLastName; 
  }
}



public class Forum {
  private String mTopic;
  public Forum(String topic){
    mTopic = topic;
  }
  public String getTopic() {
      return mTopic;
  }

  public void addPost(ForumPost post) {

      System.out.printf("New post from %s %s about %s.\n",
                         post.getAuthor().getFirstName(),
                         post.getAuthor().getLastName(),
                         post.getTitle());

  }
}


public class Example {

  public static void main(String[] args) {
    System.out.println("Starting forum example...");
    if (args.length < 2) {
       System.out.println("first and last name are required. eg:  java Example Craig Dennis");
    }
    Forum forum = new Forum("Java");
    // Take the first two elements passed args
    User author = new User(args[0], args[1]);
    //Add the author, title and description
    ForumPost post = new ForumPost(author, "Some Title","Treehouse is the best!");
    forum.addPost(post);
  }
}