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Thread: Simple Calculator

  1. #1
    Junior Member
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    Feb 2013
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    Default Simple Calculator

    Hi there, I'm building a simple GUI calc with swing + netbeans.
    I'm a little puzzled on how to organise input and output given that the screen needs to default back to 0.0 instead of just a blank bar. I need it so when you enter text the 0.0 disappears, and control when it reappears/disappears.

    I've tried things like
    (This will be pressing the 0 button.)
    if(txtDisplay.getText() == "0.0"){
                txtDisplay.setText(txtDisplay.getText() + " 0");
    Last edited by Norm; February 25th, 2013 at 07:22 AM. Reason: added ending code tag

  2. #2
    Crazy Cat Lady KevinWorkman's Avatar
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    Default Re: Simple Calculator

    First off, don't use == with String. Do a search of these forums or on google for great explanations on what you should use instead.

    Secondly, you don't tell us what this code actually does. Does it work? Throw an error? Something else?
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  3. The Following User Says Thank You to KevinWorkman For This Useful Post:

    Spanky13 (February 25th, 2013)

  4. #3
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    Default Re: Simple Calculator

    thanks i have researched it and found suitable answer.

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