I don't understand what's wrong with this. please help

Question

Im doing a project in the Java track and im stuck, the "preview" is saying that i need to define a return type for the constructors, which doesn't make sense.

Forum.java

public class Forum {
  private String topic;

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

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

  public String getTopic() {
    return topic;
  }



  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;

  }

  // TODO: add getters for firstName and lastName
  public String getFirstName() {
    return firstName;
  }

  public String getLastName() {
    return 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 getUserInfo(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");
    // TODO: pass in the first name and last name that are in the args parameter
    User author = new User("Sabath", "Rodriguez");
    //TODO: initialize the forum post with the user created above and a title and description of your choice
    ForumPost post = new ForumPost(author, "SomeTitle", "SomeDescription");
    forum.addPost(post);

  }

}

Answer 1 · 2017-12-30T18:25:29Z

December 30, 2017 6:25pm

A constructor has to have the exact same name as the class it is placed in. If it doesn't then it will be treated as a regular method. You have called the constructor for the Forum class getForum and the constructor for the ForumPost class getUserInfo.

So if you rename getForum to Forum and getUserInfo to ForumPost (remember that the names are case-sensitive) then that error will go away. There is another minor issue in your code though, which is the fact that the challenge asks you to create the User object using the arguments passed to the program. You have passed in your own name instead.

To retrieve values that have been passed as arguments you simply need to extract values from the args object. The first value that has been passed to the program will be in args[0], the second in args[1], and so on. So the line that creates the User object in Main.java should look like this:

User author = new User(args[0], args[1]);

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sabath rodriguez

sabath rodriguez

I don't understand what's wrong with this. please help

1 Answer

andren

andren

Jialong Zhang

Jialong Zhang