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Thread: Cipher Program - Not sure what this error is - PLEASE HELP

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    Default Cipher Program - Not sure what this error is - PLEASE HELP

    This message has been deleted.
    Last edited by Jstew2408; October 24th, 2011 at 11:07 PM.


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    Default Re: Cipher Program - Not sure what this error is - PLEASE HELP

    It would help if you posted this in your other thread which contains the code.
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    Default Re: Cipher Program - Not sure what this error is - PLEASE HELP

    This message has been deleted.
    Last edited by Jstew2408; October 24th, 2011 at 11:05 PM.

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    Default Re: Cipher Program - Not sure what this error is - PLEASE HELP

    private int location = alphabet.indexOf (e);
    private static String abcdefghijklmnopqrstuvwxyz;
    private static final String alphabet = abcdefghijklmnopqrstuvwxyz;
    On line 1 you call indexOf method on the alphabet variable. On line 3 you assign the alphabet variable to have the same value as the abcdefg... variable AND NOT the String "abcdefg..." not sure what you are trying to do. On line 2 the abcdefg... variable is null. Therefore alphabet is also null. So on line 1 you actually have null.indexOf which gives you the NullPointerException.
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    Default Re: Cipher Program - Not sure what this error is - PLEASE HELP

    This message has been deleted.
    Last edited by Jstew2408; October 24th, 2011 at 11:05 PM.

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    Default Re: Cipher Program - Not sure what this error is - PLEASE HELP

    We don't need you posting the full assignment. Did you read my reply? It explains what you are doing wrong. If you don't understand what I said then ask a specific question.
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    Default Re: Cipher Program - Not sure what this error is - PLEASE HELP

    How do I create a:
    instance variable key?
    private static final String with the alphabet?
    constructor with an int parameter?
    and a constructor with a key to be passed in value?

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    Default Re: Cipher Program - Not sure what this error is - PLEASE HELP

    The only problem is that you have not initialised the alphabet variable to a String. Perhaps you meant to do this
    private static final String alphabet = "abcdefghijklmnopqrstuvwxyz";
    Notice the difference.
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    Default Re: Cipher Program - Not sure what this error is - PLEASE HELP

    What is the difference?

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    Default Re: Cipher Program - Not sure what this error is - PLEASE HELP

    :headdesk:
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    Default Re: Cipher Program - Not sure what this error is - PLEASE HELP

    Jstew2408, please do not delete your posts....this defeats the purpose of these forums as a place to get help, both for yourself and for others in the future with similar problems. I for one would like to help, but have no clue what the problem is because you deleted it. And I can only speak for myself, but deleting things like this isn't necessarily encouraging me to try to help you, now or in the future.

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