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Java Java Objects Delivering the MVP Forum

Saad Hamid
Saad Hamid
3,150 Points

Not able to complete Challenge Task 4

I am having trouble in completing Challenge Task 4

I am not able to figure out what length is required to clear the challenge

I am trying to put if(!(args.length ==2)) with a logic that if first name and last name are entered only then "args" length would be 2 else it would be less than 2. and in case if it's less than 2, system should exit the program.

Can anyone please help me out with this?

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 {
  // 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 this.firstName; 
  }
public String getLastName()
  {

   return this.lastName; 
  }
  // TODO: add getters for firstName and 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("Saad", "Hamid");
    // TODO: initialize the forum post with the user created above and a title and description of your choice
    ForumPost post = new ForumPost(author, "Mr", "Aweseme");
    forum.addPost(post);

// */
  }

}

1 Answer

Hi Saad,

The main method has an argument - it is an array of strings called args.

The first two elements in that array are the first name, at index 0, and the last name at index 1.

Pass those two things into the User constructor.

I hope that's enough of a clue but do let me know how you get on.

Steve.

So, for example, the application is run by calling main("Saad", "Hamid"); - that's what args holds.