Java Java Objects Delivering the MVP Forum

Help now, I need to fix this.

After you uncomment the code in and, fix the code as described in the comments of The code in main is attempting to use the code you just fixed.
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 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",

public class User {
  private String firstName;
  private String lastName;
  // TODO: add private fields for firstName and lastName

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

  public String getFirstName(){
    return firstName;

  public String getLastName(){
    return lastName;

  // TODO: add getters for firstName and lastName

public class ForumPost {
  private User author;
  private String title;
  private String description;

  public ForumPost(User author, String title, String description){ = author;
    this.title = title;
    this.description = 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;
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");
    Forum forum = new Forum("Java");
    // TODO: pass in the first name and last name that are in the args parameter
    String firstName = args[0];
    String lastName = args[1];
    User author = new User(args[0], args[1]); //<----- all cruicial points marked with comments
    // TODO: initialize the forum post with the user created above and a title and description of your choice
    ForumPost post = new ForumPost(author, "Something", "Otherthing");


In, which is correct in using objects? We have ForumPost.addPost(Post); What about obj.method();

What are you trying to ask? I don't understand your question.