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Thread: Help with checking JButton positions please

  1. #51
    Super Moderator Norm's Avatar
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    Default Re: Help with checking JButton positions please

    that still doesn't work,
    Please explain.

    Why use client properties when the class has a method you can call directly to determine if it has an image: see the icon get and set methods for the class.
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: Help with checking JButton positions please

    I have already set the button to have an ImageIcon though, I just need to know how I can tell if it has an image or not,

    say I have two buttons I click on one, and I want to know if the left of that button has an image?

  3. #53
    Super Moderator Norm's Avatar
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    Default Re: Help with checking JButton positions please

    how I can tell if it has an image or not,
    Call the method that will return the image if it has one. Read the API doc for the JButton class and see what method returns the current icon/image that the object is using.
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: Help with checking JButton positions please

    I have looked at the API, and I can only find checkImage(), but not sure how to use it in this context :/ ?
    Thanks for all your help again

  5. #55
    Super Moderator Norm's Avatar
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    Default Re: Help with checking JButton positions please

    Your code uses the setIcon() method to set the image.
    Look at the getIcon() method for getting the image that was set with the setIcon() method.
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: Help with checking JButton positions please

    I have tried:

                System.out.println("There is an image!");
            }

    But I get a nullPointerExceptionError?

  7. #57
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    Default Re: Help with checking JButton positions please

    I get a nullPointerExceptionError
    What variable is null? Where does the code assign a non-null value to the variable?
    See posts #49 and 43. Make sure the code is not using a variable that is local to a method.
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: Help with checking JButton positions please

    it assigns a null value to the 'leftbtn', I just can't seem to get it :/

  9. #59
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    Default Re: Help with checking JButton positions please

    That means that the button array has a null value. Why does the button array have a null value?

    See posts #49 and 43. Make sure the code is not using a variable that is local to a method.
    How many variables named: button are defined in the code?
    Which one has values assigned to it?
    Which one NEVER has values assigned to it and will contain null entries?
    If you don't understand my answer, don't ignore it, ask a question.

  10. The Following User Says Thank You to Norm For This Useful Post:

    sim18 (December 4th, 2012)

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    Default Re: Help with checking JButton positions please

    THANK YOU SOOOOOOOO MUCH!
    You have made my day!!!

  12. #61
    Super Moderator Norm's Avatar
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    Default Re: Help with checking JButton positions please

    Glad you found it. I don't know why IDEs don't give warnings when variable definitions shadow other definitions.
    If you don't understand my answer, don't ignore it, ask a question.

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