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Thread: NullPointerException when using methods to find matching chars in two arrays.

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    Default NullPointerException when using methods to find matching chars in two arrays.

    I am currently
    Last edited by Javaisfrustrating; November 22nd, 2011 at 09:55 PM.


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    Default Re: NullPointerException when using methods to find matching chars in two arrays.

    Exception in thread "main" java.lang.NullPointerException
    at DMVExam.getNumCorrect(DMVExam.java:52)
    This error message says you are trying to use a variable with a null value at line 52.
    Look at line 52 and see what variable is null and backtrack to see why it does not have a valid value.
    If you can not see what variable is null, add a println just before line 52 and print out the values of all the variables used in line 52.

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    Default Re: NullPointerException when using methods to find matching chars in two arrays.

    public DMVExam() {
        char[] solution =
    You should follow Norm's advice as it explains how to track down your problems in the future without relying on others. However I have given you a hint.
    Improving the world one idiot at a time!

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    Default Re: NullPointerException when using methods to find matching chars in two arrays.

    Why don't IDEs and compilers give warnings for shadowed variable definitions?
    So many students have that problem.

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    Default Re: NullPointerException when using methods to find matching chars in two arrays.

    More closer hint:
    class A{
    private int variable;
    A(){
    int variable;
    }
    }

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