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Java Java Objects Delivering the MVP Forum

jose rodriguez
jose rodriguez
16,524 Points

I am finished up but compiler is throwing a code for a part that I dont think I was supposed to change

now that I finally got to this last part. I worked my way to 4 of 4 and hit check work. the "Bummer" sign shows and i check what is wrong and it give me the following message. any suggestions on how to fix this?

./Main.java:16: error: non-static method addPost(ForumPost) cannot be referenced from a static context Forum.addPost(post); ^ Note: JavaTester.java uses unchecked or unsafe operations. Note: Recompile with -Xlint:unchecked for details. 1 error

Forum.java
public class Forum {
  private String topic;

  // TODO: add a constructor that accepts a topic and sets the private field 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 {
  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: 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 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);
    }
  //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(args[0], args[1]);
    // TODO: initialize the forum post with the user created above and a title and description of your choice
    ForumPost post = new ForumPost( author, "title", "new description");
    Forum.addPost(post);


  }

}

2 Answers

samiff
samiff
31,206 Points

Hey Jose,

You were super close, but made a small typo in Main.java:

Forum.addPost(post);

You are referencing the Forum class, rather than your instantiated object instance forum with a lower case f that you created earlier. Make that small change and all should be well!