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Java Java Objects (Retired) Delivering the MVP Wrapping up

Kenneth Balajadia
Kenneth Balajadia
2,009 Points

Alright so now let's focus on ForumPost. It's going to need a constructor that takes a User author a String title and a

I dont know how to fix the error heres the error: ./ForumPost-java:7: error : incompatible types: String cannot be converted to User mAuthor = author; 1 error

pls help.. this is the question im in challenge task 3 of 4 i cant fix this challeng 3..

Alright so now let's focus on ForumPost. It's going to need a constructor that takes a User author a String title and a String description. Don't forget to initialize the member fields in the constructor. Also please add the getter for mDescription.

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

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

  public User getAuthor() {
    return mAuthor;
  }

  public String getTitle() {
    return mTitle;
  }

  // TODO: We need to expose the description
  public String getDescription() {
    return mDescription;
  }
}
User.java
public class User {

  private String mFirstName;
  private String 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 Forum(String topic) {
    mTopic = topic;
  }

  public String getTopic() {
      return mTopic;
  }

  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

Kourosh Raeen
Kourosh Raeen
23,733 Points

In the ForumPost constructor the author parameter should have a type of User, not String:

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