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Thread: Implementing the compareTo method?

  1. #1
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    Default Implementing the compareTo method?

    I have an assignment that's asking me to create a method which "Implements the compareTo method provided by the Comparable interface. Allows two objects to be compared based on sortKey(sortKey is just an int value 1,2,or 3)." What exactly is this asking me to do? Am I supposed to use "implements Comparable" in the class? If so, what functionality does this implemented method provide for me to help me sort objects such as strings in alphabetical order?

    I hope someone can help.


  2. #2
    Member snowguy13's Avatar
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    Default Re: Implementing the compareTo method?

    I am not 100% sure on this, but yes I believe you have to add "implements Comparable" to the class name.

    What this does is requires your class to have the method "compareTo". If you say your class implements Comparable and then don't add a compareTo method, you will encounter an error.

    What I am not sure of is whether you have to override the method by adding your own code to compare the objects, or if the method will automatically compare the objects for you. Now that I think about it a bit more, I believe you have to write you own code to compare the two objects. You may want to take a look at this, it will be helpful (hopefully).

    Hopefully this helps1
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  3. #3
    Super Moderator Norm's Avatar
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    Default Re: Implementing the compareTo method?

    Have you read the API doc for the Comparable interface? Most of your questions are answered there.
    Go to this site and Find Comparable in lower left, click on link for doc in main window.
    Java Platform SE 6

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