Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

Java Java Objects (Retired) Delivering the MVP Wrapping up

Donna Norris
Donna Norris
5,197 Points

Initialise the mFirstName field in the constructor?

It's asking "Have you initialised the mFirstName field in the constructor?"

Not sure how to do this...

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

  public User getAuthor() {
    return mAuthor;
  }

  public String getTitle() {
    return mTitle;
  }

  // TODO: We need to expose the description
}
User.java
public class User {
    private String mFirstName;
  private String mLastName;

  public String getFirstName(String firstName){
    firstName=mFirstName;
    return firstName;
  }

  public String getLastName(String lastName){
    lastName=mLastName;
    return lastName;
  }
  public User(String firstName, String lastName) {
    // TODO:  Set the private fields here

  }
}
Forum.java
public class Forum {
  private String mTopic;

  public String getTopic() {
      return mTopic;
  }

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

  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());
      */
  }
}
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");
    // Take the first two elements passed args
    // User author = new User();
    // Add the author, title and description
    // ForumPost post = new ForumPost();
    // forum.addPost(post);
  }
}

1 Answer

Jordan Ernst
Jordan Ernst
5,121 Points
public class User {
    private String mFirstName; // member variables or also known as fields
    private String mLastName;

  public String getFirstName(String firstName){ // the constructor field has no return type
    firstName=mFirstName;
    return firstName; // return mFirstName instead
  }

  public String getLastName(String lastName){
    lastName=mLastName;// actually not necessary you can simply return mLastName because of your constructor 
    return lastName; // return mLastName instead
  }
  public User(String firstName, String lastName) {// this would be your constructor so you need to build in here.
    // TODO:  Set the private fields here

   mFirstName= firstName;
   mLastName= lastName;

  }
}