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Java Java Objects Delivering the MVP Forum

Zhoubing Yang
Zhoubing Yang
1,399 Points

Getting this Bummer msg When trying to compiled User.java. What did I do wrong?

In User.java I got this message: Bummer! java.lang.IllegalArgumentException: ParseException: com.github.javaparser.ParseException: Encountered " ";" "; "" at line 3, column 20. Was expecting one of: <IDENTIFIER> ... <IDENTIFIER> ... <IDENTIFIER> ... <IDENTIFIER> ... <IDENTIFIER> ... <IDENTIFIER> ... <IDENTIFIER> ... <IDENTIFIER> ... <IDENTIFIER> ... <IDENTIFIER> ... <IDENTIFIER> ... (Look around Inspector.java line 73)

Forum.java
public class Forum {
  private String topic;

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

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

  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
  private firstName;
  private 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 getters(){
    return firstName + " " + 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);

// */
  }

}

1 Answer

Hi there,

A couple of points here.

In Forum.java you have declared topic a second time. Delete the line as indicated below:

public class Forum {
  private String topic; // already declared here

  // TODO: add a constructor that accepts a topic and sets the private field topic
  String topic; // <- so delete this

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

Next, in User.java you haven't added a data type of firstName or lastName. They are strings, so amend you code to:

  private String firstName;
  private String lastName;

Your constructor for User looks fine but you haven't added the getters and setters helper methods correctly. I'll do them for firstName - you'll need to do lastName:

public String getFirstName(){
  return firstName;
}

public void setFirstName(String firstName){
  this.firstName = firstName;
}

I think that should sort your issues out and let you carry on with the rest of the challenge.

Steve.

Zhoubing Yang
Zhoubing Yang
1,399 Points

Thank you Steve, you are awesome.

Hey, no problem! :+1: :smile: