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Java Java Objects (Retired) Delivering the MVP Wrapping up

Posted by Ramy Obeid
Ramy Obeid
2,373 Points

i have to un-comment the main method in example.java fixing the bugs as i go but i cant seem to do it :D

i did un-comment the line in the forum.java but the bugs i m stuck thx guys

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

  public User getAuthor() {
    return mAuthor;
  }

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

  // TODO: We need to expose the description
}
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 String getTopic() {
      return mTopic;
  }
   public Forum(String topic) {
    mTopic = topic;
  }


  public void addPost(ForumPost post) {

      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);
  }
}

1 Answer

Kourosh Raeen
Kourosh Raeen
23,733 Points
Kourosh Raeen
Kourosh Raeen
23,733 Points

When creating a new user, the constructor expects two arguments, firstName and lastName. You can find these in the args array. Also, the ForumPost constructor expects three arguments, author, title, and description so you need to pass those in. We've already created an author in the previous line so we use that as the author and for title and description you can just use some string literals:

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, "Java constructors", "What is a default constructor?");
    forum.addPost(post);
  }
}
Ramy Obeid
Ramy Obeid
2,373 Points

ohh isee i did do the args but i did (args [2]) not like you thx a lot kourosh !!