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Java Java Objects Delivering the MVP Forum

Enyang Mercy
PLUS
Enyang Mercy
Courses Plus Student 2,339 Points
Posted by Enyang Mercy
Enyang Mercy
Courses Plus Student 2,339 Points

Compiler error syntax error@ Main.java

Help!!!!!! I cant compile this

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

  // TODO: add a constructor that accepts a topic and sets the private field top
  public Forum(String topic) {
    this.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 String firstName;
  private String lastName;

  public User(String firstName, String lastName) {
    // TODO: set and add the private fields
    this.firstName = firstName;
    this.lastName = lastName;
  }
  public String getFirstName() {
    return firstName;
  }
  public String getLastName() {
    return lastName;

  }
  // TODO: add getters for firstName and lastName
}
ForumPost.java 
public class ForumPost {
  private User author;
  private String title;
  private String 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");
   User author = new User(args[0]args[1]);
   ForumPost post = new ForumPost(author,"title","description");
     forum.addPost(post);
  }
}

2 Answers

andren
andren
28,558 Points
andren
andren
28,558 Points

There are three issues:

  1. You need to have a comma between the args[0] and args[1] argument when initializing the User class in the Main.java file.
  2. In the Forum.java file you have two constructors, one working one and one incomplete one. You need to remove the incomplete one.
  3. You have not uncommented the commented out code found in Forum.java like the challenge has instructed you to.

If you fix these issues like this:

Forum.java

public class Forum {
  private String topic;

  public Forum(String topic) { // Remove incomplete constructor and keep working one
    this.topic = topic;
  }

  public String getTopic() {
    return topic;
  }

  // The method below is commented out in your code
  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()
    );
  }
}

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");
   User author = new User(args[0], args[1]); // Place a comma between the two arguments
   ForumPost post = new ForumPost(author,"title","description");
   forum.addPost(post);
  }
}

Then your code will work.