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Java Java Objects (Retired) Delivering the MVP Wrapping up

Vinayak Gadag
Vinayak Gadag
749 Points

Error in ForumPost object in Example.java

Getting error for FOrumPost object in the Example.java

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, 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 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("Craig","Dennis");
    // Add the author, title and description
     ForumPost post = new ForumPost(User.getFirstName,"Java","oops language");
     forum.addPost(post);
  }
}

2 Answers

Here is your problem:

    //Take the first two elements passed args
     User author = new User("Craig","Dennis");
    // Add the author, title and description
     ForumPost post = new ForumPost(User.getFirstName,"Java","oops language");

The first comment tells you to take the first 2 elements passed args. This can be confusing since you haven't worked with the main method, but it is referring to the args parameter in the main method.

  public static void main(String[] args) {

They want you to use the String array args to pass in the first and last name, not assign your own. Remember, you do 'arrayName[0]' to get the first value in an array.

The second part of your problem is ForumPost asks for 'User' (aka author) and you passed in a String.

  //first parameter is a 'User'
  public ForumPost(User author, String title, String description){

Good news for you is previously in your main method you declared a 'User' object.

     User author = new User("Craig","Dennis");

I will let you piece this all together, as this is an extremely challenging question and I am surprised you got this far!

Hi there,

The ForumPost constructor wants you to pass it a User object, not a name. Try sending in the User instance you have already created called author instead of User.firstName. You will then need to follow the instructions about the args[] regarding the name of the User. Get back to me if you need more help.

Steve.