Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

Java Java Data Structures Organizing Data Comparable

Posted by Mary Morin
Mary Morin
2,591 Points

In this step, cast the Object passed to the compareTo method to a com.example.BlogPost. Check for equality first, if the

I seriously cannot figure out what I'm doing wrong for this question. I've tried several different methods of input at the bottom but have no idea what's wrong. Previous video isn't helping much either. Any help is appreciated!

com/example/BlogPost.java 
package com.example;

import java.util.Date;

public class BlogPost implements Comparable {
  private String mAuthor;
  private String mTitle;
  private String mBody;
  private String mCategory;
  private Date mCreationDate;

  public BlogPost(String author, String title, String body, String category, Date creationDate) {
    mAuthor = author;
    mTitle = title;
    mBody = body;
    mCategory = category;
    mCreationDate = creationDate;
  }

  public String[] getWords() {
    return mBody.split("\\s+");
  }

  public String getAuthor() {
    return mAuthor;
  }

  public String getTitle() {
    return mTitle;
  }

  public String getBody() {
    return mBody;
  }

  public String getCategory() {
    return mCategory;
  }

  public Date getCreationDate() {
    return mCreationDate;
  }

  @Override
  public int compareTo(Object obj) {
    this.obj = BlogPost;
    if(equals(Other))//Check for equality first
{
  return 0;
}
  return 1;
  }
}

1 Answer

andren
andren
28,558 Points
andren
andren
28,558 Points

You say the previous video doesn't offer much help but it seems you might have skimmed through it a bit to quickly as the video shows you exactly how to solve this task. The code that was used in the previous video:

Treet other = (Treet) obj;
if (equals(other)) {
    return 0;
}

Shows exactly how to cast an object, the only thing you need to change about the code is the name of the object from Treet to BlogPost. Like this:

public int compareTo(Object obj) {
    BlogPost other = (BlogPost) obj;
    if(equals(other)) {
        return 0;
    }
    return 1;
}

You might want to rewatch the video one more time, casting objects is a pretty important concept in Java so having a good grasp on it will be somewhat important not just for this challenge but for when you become a professional programmer as well.