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Java Java Objects Delivering the MVP Forum

Help please!!

first task, any good so far?

Forum.java
public class Forum {
  private String topic;

  // TODO: add a constructor that accepts a topic and sets the private field topic

  public static void main(String[] args) {

  }

  public String getTopic() {
    return topic;
  }


  /* Uncomment this when you are prompted to do so
  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

  public User(String firstName, String lastName) {
    // TODO: set and add the private fields

  }

  // TODO: add getters for firstName and 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 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);
    }
    /* 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);

// */
  }

}

What is the problem you are having? What are you trying to do right now, and what is going wrong?

1 Answer

Tonnie Fanadez
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.a{fill-rule:evenodd;}techdegree seal-36
Tonnie Fanadez
UX Design Techdegree Graduate 22,793 Points

Hello YZ L

So the first task needs you to add a constructor on the Forum Class

  • Java Constructors begin with the keyword public
  • Java Constructors have no return type
  • Java Constructors assumes the name of the class
  • Java Constructors can be empty or accept arguments

The name of the class is Forum and accepts String Topic . You also need to set the Forum class member variable to the String Topic passed to the constructor. To do this you need this keyword to point to the member variable declared at the top of the class

See my code below with comments

// TODO: add a constructor that accepts a topic and sets the
// private field topic
public Forum (String topic) {

//use this keyword to differentiate between String topic at the top 
//and String topic inside the constructor
this.topic = topic
}

Thanks!!!!