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Java Java Objects Delivering the MVP Forum

Vidmantas Varnas
Vidmantas Varnas
5,215 Points

Im stuck on forum tast 4

Im gettig this error : 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 could be wrong with code?

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());

  }
}
User.java
public class User {
  private String firstName;
  private String lastName;
  public User(String firstName, String lastName) {
    // TODO:  Set the private fields here
    this.firstName = firstName;
   this.lastName = lastName;
  }

  public String getFirstName() {
    return this.firstName; 
  }

  public String getLastName() {
    return this.lastName; 
  }

}
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;
  }

  public String getDescription() {
   return mDescription; 
  }
}
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, "first", "last");
    forum.addPost(post);

  }

}

1 Answer

The code of the addPost method in the Forum class is not how it should be. It's weird because the challenge doesn't require you to edit this part of the code.

Anyway, correct it like this and it should work:

  public void addPost(ForumPost post) {
    System.out.printf("A new post in %s topic from %s %s about %s is available",
            mTopic,
            post.getAuthor().getFirstName(),
            post.getAuthor().getLastName(),
            post.getTitle()
    );
  }

The automatic tests probably evaluate the output of this method, so removing the topic threw them off.