Comparable, Task 2

Question

Hi.

I'm stuck here. I'd appreciate any help.

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 int compareTo(Object obj) {
    return (1);
    if (obj == com.example.BlogPost) {
      return 0;
    }
  }

  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;
  }
}

Answer 1 · 2015-07-21T23:06:29Z

July 21, 2015 11:06pm

Hi Sean,

A couple of small mistakes. I'll post your code first for reference:

 public int compareTo(Object obj) {
    return (1);
    if (obj == com.example.BlogPost) {
      return 0;
    }
  }

Returning 1 should be your "default" and so you want to check if obj is equal to the blogpost first:

 public int compareTo(Object obj) {
    if (obj == com.example.BlogPost) {
      return 0;
    }
    return 1;
  }

This one is a little trickier, but the idea is that you are calling the compareTo method on an instance of BlogPost, and so you want to compare the 'obj' to that instance instead of the BlogPost class.

Since you are using the compareTo method on an instance, you can use this

 public int compareTo(Object obj) {
    if (obj == this) {
      return 0;
    }
    return 1;
  }

I hope this helps, let me know if you have any more questions.

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Sean Flanagan

Sean Flanagan

Comparable, Task 2

1 Answer

Jon Kussmann

Jon Kussmann

Sean Flanagan

Sean Flanagan