Java Java Objects Delivering the MVP Forum

Sebastian Manczak
Sebastian Manczak
3,551 Points

Forum question last part.

I'm on the last part and this alert doesn't let me finish the task: !Are you sure you used the arguments passed in from the main method in Main.java? args[0] is the firstName and args[1] should be the last name!"

What else do I need to correct?

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) {
    this.topic = 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;
  private String lastName;

  public User(String firstName, String lastName) {
    // TODO: set and add the private fields
    firstName = "";
    lastName = "";
  }
  public String getFirstName() {
    return firstName;
  }
  public String getLastName() {
    return lastName;
  }

  // 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 ForumPost(User author, String title, String description) {
  this.author = author;
  this.title = title;
  this.description = 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(args[0], args[1]);
    // TODO: initialize the forum post with the user created above and a title and description of your choice
    ForumPost post = new ForumPost(author, "title", "description");
    forum.addPost(post);


  }

}

2 Answers

Steve Hunter
MOD
Steve Hunter
Treehouse Moderator 57,556 Points

Hi there,

In your User constructor, set the names to the values passed in:

  public User(String firstName, String lastName) {
    // TODO: set and add the private fields
    firstName = ""; // <- this should be set to the value passed in; this.firstName = firstName
    lastName = "";
  }

At the moment, your constructor sets the local variables that are passed in as arguments to an empty string. You want to set this.firstName to the value passed in.

I hope that helps!

Steve.

Sebastian Manczak
Sebastian Manczak
3,551 Points

Yes, it worked. Thank you Seve.