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Java Java Objects Delivering the MVP Forum

Posted by Nikolaus Schroeder
Nikolaus Schroeder
838 Points

I do not understand the "args parameter" in the question 4/4 for Java Objects "Forum" questions.

Things I need clarified:

  1. What exactly is the args parameter that this question is referring to?

2.How do you connect the arguments? How is the firstName and lastName passed into it in this case?

Thank you.

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;
  }



  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
    firstName = "Nik";
    lastName = "Schroeder";

  }

  // 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) {
  User = author;
  title = "Is Java smart";
  description = "I don't think so but it might be.";
}
  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();
    // TODO: initialize the forum post with the user created above and a title and description of your choice
    ForumPost post = new ForumPost();
    forum.addPost(post);

// 
  }

}

1 Answer

gmilan
gmilan
9,287 Points
gmilan
gmilan
9,287 Points

Your code should not pass for question 2. Your not declaring a firstName "Nick and lastName "Schroeder" In User class. Instead, by creating a constructor your allowing the object (that your going to make in class Main ) access to private variables of the class User. question 4 of 4 is asking you to plug in "Nick", "Schroeder" inside the args or parenthesis of the new object created. 

public class User {

  private String firstName; 
  private String lastName; 

  public User(String firstName, String lastName) {

    firstName = this.firstName; 
    lastName = this.lastName; 
  }

  public String getFirstName() {
    return firstName; 
  }

  public String getLastName() {
    return lastName; 
  }
}