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Java Java Objects (Retired) Delivering the MVP Wrapping up

Posted by Federico Ades
Federico Ades
934 Points

I can't get throw this exercise

When I run the code, it seems to be ok but the compiler in the exercise says me that "Bummer! I expected to se the the names I passed in through the args, but I do not. Hmm". And I don't understand what I'm doing wrong. Can you help me? Thank you very much.

ForumPost.java 
public class ForumPost {
  private String mFirstName;
  private String mLastName;
  private String mTitle;
  private String mDescription;

  public ForumPost (User author, String title, String description) {
    mFirstName = author.getFirstName();
    mLastName = author.getLastName();
    mTitle = title;
    mDescription = description;
  }

  public String getAuthor() {
    return (mFirstName + ' ' + mLastName);
  }

  public String getTitle() {
    return mTitle;
  }

  public String getDescription() {
    return mDescription;
  }

  // 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 Forum (String topic) {
    mTopic = topic;
  }

  public String getTopic() {
      return mTopic;
  }

  public void addPost(ForumPost post) {

      System.out.printf("New post from %s about %s.\n",
                         post.getAuthor(),
                         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");
    User author = new User("Federico", "Ades");
    ForumPost post = new ForumPost(author, "Its Amazing", "Im in love with this lenguage");
    forum.addPost(post);
  }
}

1 Answer

Seth Kroger
Seth Kroger
56,414 Points
Seth Kroger
Seth Kroger
56,414 Points

The challenge asks you to use the name passed in through command line arguments for the author. Instead of using your name, you should use the first two elements of args:

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");
    User author = new User(args[0], args[1]);
//----------------------------^  Use args here instead of hard-coding author name.
    ForumPost post = new ForumPost(author, "Its Amazing", "Im in love with this lenguage");
    forum.addPost(post);
  }
}
Federico Ades
Federico Ades
934 Points

Thank you very much for your answer! My problema is here when I try to pass to the constructor the object User. I don't know how to do it:

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

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

public User getAuthor() { return mAuthor; }

public String getTitle() { return mTitle; }

public String getDescription() { return mDescription; }

Federico Ades
Federico Ades
934 Points

Ok i solved it! Thank you very much!