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Java Java Data Structures Organizing Data Comparable

Posted by anthony fontes
anthony fontes
12,405 Points

stuck on third part of challenge

error: Expected -1 but received 1, when comparing Sun Jul 20 20:18:00 UTC 1969 to Mon Mar 09 16:00:00 UTC 2015

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

  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;
  }
}

2 Answers

srikarvedantam
srikarvedantam
8,369 Points
srikarvedantam
srikarvedantam
8,369 Points

In BlogPost.compareTo(...) , you are returning '1' at the end of the method, rather try returning 'datecmp' as the return value.

jcorum
jcorum
71,830 Points
jcorum
jcorum
71,830 Points

You create an int variable datecmp, but you never use it. Try something like this instead:

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

Since compareTo() returns an int you can just return it, instead of creating a temporary variable.