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Java Java Data Structures - Retired Organizing Data Comparable

Posted by linda wu
linda wu
3,016 Points

Task one no longer pass

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; }

public int compareTo(Object obj) { BlogPost post = (BlogPost) obj;

if(equals(post)) {
  return 0;
} 

int dateCmp = compareTo(post.getCreationDate());
if (dateCmp <0) 
{
  return -1;
}
return dateCmp;

} }

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;
  }

  public int compareTo(Object obj) {
    BlogPost post = (BlogPost) obj;

    if(equals(post)) {
      return 0;
    } 

    int dateCmp = compareTo(post.getCreationDate());
    if (dateCmp <0) 
    {
      return -1;
    }
    return dateCmp;
  }
}
Mike Papamichail
Mike Papamichail
4,883 Points
Mike Papamichail
Mike Papamichail
4,883 Points

Hey there, from what i can see there are a few mistakes inside your code.Sadly your code is hard to read due to it's text format-maybe you could try and post it as a code part?

Anyway, your compareTo(Object obj) method should look like this :

@Override
  public int compareTo(Object obj) {
    BlogPost post = (BlogPost) obj;
    if (equals(post)) {
      return 0; 
    }
    if (mCreationDate.compareTo(post.mCreationDate) == 0) {
      return 0; 
    }
    return mCreationDate.compareTo(post.mCreationDate);
  }

1) You must use the @override annoation in this challenge 2)In your code you are using a dateCmp variable where you don't have to and you're also not comparing the dates on both objects.You're only doing :

int dateCmp = compareTo(post.getCreationDate());

which compares the object that you called the compareTo method on with the post's date.So, that's not correct.in order to compare both objects's dates, you should do -as stated in my code above-

mCreationDate.compareTo(post.mCreationDate)