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Java Java Objects (Retired) Delivering the MVP Wrapping up

Posted by Martins Rokis
Martins Rokis
6,995 Points

looking for error

hi, i am so close to finish this course, but in final step i got message "I expected to see the names I passed in through the args, but I do not. Hmm." which arguments are expected? please help thanks

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

  public User getAuthor() {
    return mAuthor;
  }

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

  }


  // TODO: We need to expose the description
}
User.java 
public class User {
    private String mFirstName;
    private String mLastName;
  public String getFirstName() {
      return mFirstName;
  }
  public String getLastName() {
      return mLastName;
  }
  public User(String firstName, String lastName) {
    mFirstName=firstName;
    mLastName=lastName;
  }
}
Forum.java 
public class Forum {
  private String mTopic;

  public String getTopic() {
      return mTopic;
  }
  public Forum(String topic){
    mTopic=topic;
  }

  public void addPost(ForumPost post) {

      System.out.printf("New post from %s %s about %s.\n",
                         post.getAuthor().getFirstName(),
                         post.getAuthor().getLastName(),
                         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("Craig","Dennis");

     ForumPost post = new ForumPost(author,"Java","Craig");
     forum.addPost(post);
  }
}
alex novickis
alex novickis
34,894 Points

something is being passed in here the args here on this line public static void main(String[] args)

the example is "java Example Craig Dennis"

so you will need to take args string array apart and pass along the correct pieces to all the other functions

Right now your code is using values you put in as "Java", "Craig", "Dennis", etc

Martins Rokis
Martins Rokis
6,995 Points

i am confused which values are expected in ForumPost post = new ForumPost(); can somebody show me please, i can't solve it i think first argument is ForumPost post = new ForumPost(author,?,?); but then i need 2 strings title and description, where are those?

alex novickis
alex novickis
34,894 Points

Yes it is confusing a bit,

the main is called by something in the treehouse test system that passes that to you they are passed in command line arguments to the main - the only hint they give you is the example in the comment of the challenge

it looks like they give you this set of stuff in the args --> "java Example Craig Dennis"

so args[0] would be "java", and args[1] would be "Example", args[2] would be "Craig", and args[3] would be "Dennis"

So you'll have to use those variables when creating the new forum, author, and post

So for example in Forum object, you can do something like

Forum forum = new Forum(args[0])

Now you have to do the other 2 objects with the correct args[]