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Java Java Objects Delivering the MVP Forum

Cory Walker
Cory Walker
6,037 Points
Posted by Cory Walker
Cory Walker
6,037 Points

need assistance

Help

Forum.java 
public class Forum {
  private String topic;

  // TODO: add a constructor that accepts a topic and sets the private field topic
  public Forum(String topic){
    String topic = topic;
  }

  public String getTopic() {
    return topic;
  }


  /* Uncomment this when you are prompted to do so
  public void addPost(ForumPost post) {
    System.out.printf("A new post in %s topic from %s %s about %s is available",
            topic,
            post.getAuthor().getFirstName(),
            post.getAuthor().getLastName(),
            post.getTitle()
    );
  }
  */

}
User.java 
public class User {
  // TODO: add private fields for firstName and lastName

  public User(String firstName, String lastName) {
    // TODO: set and add the private fields

  }

  // TODO: add getters for firstName and lastName

}
ForumPost.java 
public class ForumPost {
  private User author;
  private String title;
  private String description;

  // TODO: add a constructor that accepts the author, title and description

  public User getAuthor() {
    return author;
  }

  public String getTitle() {
    return title;
  }

  public String getDescription() {
    return description;
  }
}
Main.java 
public class Main {

  public static void main(String[] args) {
    System.out.println("Beginning forum example");
    if (args.length < 2) {
      System.out.println("Usage: java Main <first name> <last name>");
      System.err.println("<first name> and <last name> are required");
      System.exit(1);
    }
    /* Uncomment this when prompted
    Forum forum = new Forum("Java");
    // TODO: pass in the first name and last name that are in the args parameter
    User author = new User();
    // TODO: initialize the forum post with the user created above and a title and description of your choice
    ForumPost post = new ForumPost();
    forum.addPost(post);

// */
  }

}
David Moody
David Moody
19,302 Points
David Moody
David Moody
19,302 Points

Your code is almost correct for the constructor. Here is your code:

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

The field "topic" was already initialized above this. So once inside the constructor don't do: String topic = topic. Instead use "this". Like this:

public Forum(String topic) {
    this.topic = topic;
}

I just ran this through the challenge and it passed. Sometimes, instead of using "this" a field will be marked "mTopic" instead of "topic." The duplication of terms in Java (such as using "topic" in multiple places) can be a little tricky at first, but you will get used to it.

David Moody
David Moody
19,302 Points
David Moody
David Moody
19,302 Points

If you need anything else with this challenge, let me know. I can explain other steps to you too.