Finally, uncomment the addPost method in Forum.java. Then for the last task, uncomment the main method in Example.java f

Hello everyone,

Im having some hard time trying to solve the last step from exercise posted bellow. I have tried almoust all options available (known by me) and none of them working.

<i>Finally, uncomment the addPost method in Forum.java. Then for the last task, uncomment the main method in Example.java fixing the bugs as you go to use the new working code. For the forum post title and description, use that to shout out about how it feels to complete this challenge. </i>

And this is my trouble code from 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");
    User author = new User(firstName, lastName);
    ForumPost post = new ForumPost(Author , Title , Description);
    forum.addPost(post);
  }

}
}

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

  public User getAuthor() {
    return mAuthor;
  }

  public String getTitle() {
    return mTitle;
  }

  public String getDescription() {
   return mDescription; 
  }

  public ForumPost(User Author, String Title , String Description) {
   mAuthor = Author;
   mTitle = Title; 
   mDescription = Description;
  }
  // TODO: We need to expose the description
}

public class User {
  private String mFirstName;
  private String mLastName;
  public User(String firstName, String lastName) {
  mFirstName=firstName;
  mLastName = lastName;  
  }
    public String getFirstName(){
    return mFirstName;
  }

  public String getLastName(){
    return mLastName;
  }  
}

public class Forum {
  private String mTopic;

  public String getTopic() {
      return mTopic;
  }

public Forum(String topic) {
   mTopic = topic;

}

  public void addPost(ForumPost post) {

      System.out.printf("New post from %s %s about %s.\n",
                         post.getAuthor().getFirstName(),
                         post.getAuthor().getLastName(),
                         post.getTitle());

  }
}

And those are the errors, they were more different errors but i solved them one by one lurking on google and now im stuck with these:

`` ./Example.java:16: error: class, interface, or enum expected } ^ ./Example.java:10: error: cannot find symbol User author = new User(firstName, lastName); ^ symbol: variable firstName location: class Example ./Example.java:10: error: cannot find symbol User author = new User(firstName, lastName); ^ symbol: variable lastName location: class Example ./Example.java:11: error: cannot find symbol ForumPost post = new ForumPost(Author , Title , Description); ^ symbol: variable Author location: class Example ./Example.java:11: error: cannot find symbol ForumPost post = new ForumPost(Author , Title , Description); ^ symbol: variable Title location: class Example ./Example.java:11: error: cannot find symbol ForumPost post = new ForumPost(Author , Title , Description); ^ symbol: variable Description location: class Example 6 errors

I appreciate any help.