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Java Java Objects Delivering the MVP Forum

chris munley
chris munley
2,204 Points

Im not quite sure what this is asking me to do.

It just says to do what the comments say but I do not understand what it is asking.

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) {
    topic = this.topic;
  }


  public String getTopic() {
    return topic;
  }



  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

  private String firstName, lastName, name;

  public User(String firstName, String lastName) {
    firstName = this.firstName;
    lastName = this.lastName;
  }

  public String getFirstName() {
    return firstName;
  }
   public String getLastName() {
    return lastName;
  }
}
ForumPost.java
public class ForumPost {
  private User author;
  private String title;
  private String description;

  public ForumPost(User author, String title, String description) {
    author = this.author;
    title = this.title;
    description = this.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);
    }

    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(author, forum, );
    forum.addPost(post);


  }

}

1 Answer

Kourosh Raeen
Kourosh Raeen
23,733 Points

Hi Chris - You have your assignments backwards in all the constructors. For example, the Forum constructor should look like this:

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

Fix all of them in a similar way.

Also, in the Main class when creating a new user you need to pass in a first name and a last name. Those you can get from the args array. args[0] would be the first name and args[1] the last name.

Finally, in the Main class when creating a ForumPost you need to pass in a description as the third argument.