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Java Java Objects Delivering the MVP Forum

Posted by Sachini Hansini Nawalaella
Sachini Hansini Nawalaella
2,842 Points

last quiz

In User.java, add private fields to store firstName and lastName, and initialize them in the provided constructor. Add public getters for firstName and lastName.

Please correct me

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 )
{
  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;

  public User(String firstName, String lastName) {
      this.FirstName = firstName;
      this.LastName = lastName;
  }

  public String getterFirstName() {
      return FirstName;
  }

   public String getterLastName() {
       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 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);

// */
  }

}

4 Answers

Fahad Mutair
Fahad Mutair
10,359 Points
Fahad Mutair
Fahad Mutair
10,359 Points

hi Sachini Hansini Nawalaella , lets start with

1st task that says

Add a constructor that accepts a String named topic to Forum.java. Initialize the private field topic in the constructor to the value passed in.

  1. Add a constructor that accepts a String named topic to Forum.java.
Forum.java 
public Forum(String topic) {

2.Initialize the private field topic in the constructor to the value passed in.

Forum.java 
this.topic = topic;

Notice , this.topic it will refer to private String topic; , and the second topic it will refer to (String topic) in the constructor

2nd task says

In User.java, add private fields to store firstName and lastName, and initialize them in the provided constructor. Add public getters for firstName and lastName.

1.In User.java, add private fields to store firstName and lastName.

User.java 
private String firstName;
private String lastName;

2.and initialize them in the provided constructor.

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

3.Add public getters for firstName and lastName.

User.java 
public String getFirstName() {
return firstName;
}

public String getLastName() {
return lastName;
}
Dekel Zoaretz
Dekel Zoaretz
14,864 Points
Dekel Zoaretz
Dekel Zoaretz
14,864 Points

I think that you had called the fields with a capital letter which is a convention for class names. Try to do it that way:

public class User {
  private String firstName;
  private String lastName;

  public User(String firstName, String lastName) {
      this.firstName = firstName;
      this.lastName = lastName;
  }

  public String getterFirstName() {
      return this.firstName;
  }

   public String getterLastName() {
       return this.lastName;
   }
}
abdijabar sambul
abdijabar sambul
1,063 Points
abdijabar sambul
abdijabar sambul
1,063 Points

this work for me:

public ForumPost(User author,String title, String description){ this.author=author ; this.title=title; this.description=discription;

}

Eric Malysa
Eric Malysa
996 Points
Eric Malysa
Eric Malysa
996 Points

This is great. I like to try to figure things out on my own, but after some time, I would like to know what I was missing if I can't figure it out. I then look and study the code that I was missing to make sure I have a good grasp on it. I noticed in the above code that your getter methods did not follow what was asked. Minor change is needed. The

//Notice the method name get not "getter". public String getFirstName() { return this.firstName; }

public String getLastName() { return this.lastName; } }