Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

Java Java Objects Delivering the MVP Forum

Posted by Gilbert Keen
.a{fill-rule:evenodd;}techdegree
Gilbert Keen
Front End Web Development Techdegree Student 4,755 Points

giving me the error make sure you uncomment in the main.java

what am i missing

Forum.java 
public class Forum {
  private String topic;
  Forum(String topic){
    this.topic=topic;
  }

  public String getTopic() {
    return topic;
  }
  User author = new User(args[0], args[1]);
  ForumPost post = new ForumPost(author, "Title", "Description");
  Forum forum = new Forum("Java");
  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 {
  private String firstName;
  private String lastName;

  public User(String firstName, String lastName) {
    this.firstName=firstName;
    this.lastName=lastName;

  }
public String getFirstName(){
return firstName;
}
  public String getLastName(){
  return lastName;
  }
}
ForumPost.java 
public class ForumPost {
  private User author;
  private String title;
  private String description;
  ForumPost(User author,String title, String description){
  User=author;
  String=title;
  String=description;
  }

  public User getAuthor() {
    return author;
  }

  public String getTitle() {
    return title;
  }

  public String getDescription() {
    return description;
  }

   User author = new User();
}
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);
  }
 }
}

3 Answers

Felix Sonnenholzer
Felix Sonnenholzer
14,654 Points
Felix Sonnenholzer
Felix Sonnenholzer
14,654 Points

Hey, that's unfortunate to hear.

Here is my solution:

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
    this.firstName = firstName;
    this.lastName = lastName;
  }

  // TODO: add getters for firstName and lastName
  public String getFirstName() {
    return firstName;
  }

  public String getLastName() {
    return 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);
  }

}
Felix Sonnenholzer
Felix Sonnenholzer
14,654 Points
Felix Sonnenholzer
Felix Sonnenholzer
14,654 Points

In Main.java is a part you have to uncomment, since it is not in the code you posted maybe you deleted it?

    /* Uncomment this when prompted
    Forum forum = new Forum("Java");
    // TODO: pass in the first name and last name that are in the args parameter
    User author = new User();
    // TODO: initialize the forum post with the user created above and a title and description of your choice
    ForumPost post = new ForumPost();
    forum.addPost(post);

// */
Gilbert Keen
seal-mask
.a{fill-rule:evenodd;}techdegree
Gilbert Keen
Front End Web Development Techdegree Student 4,755 Points
Gilbert Keen
.a{fill-rule:evenodd;}techdegree
Gilbert Keen
Front End Web Development Techdegree Student 4,755 Points

still stuck despite adding this