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  1. #1
    jperson is offline Member
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    Default some simple question?

    i want to know what's

    System.out (it's class out in package System ?)
    ---------
    JOptionPane.showMessageDialog(null,"message"); (what's first argument null)
    i want an example to use this method but first argument not null?
    ---------

  2. #2
    PhHein's Avatar
    PhHein is offline Senior Member
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    Math problems? Call 1-800-[(10x)(13i)^2]-[sin(xy)/2.362x]
    The Ubiquitous Newbie Tips

  3. #3
    jperson is offline Member
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    thank u for help PhHein but
    i can't understand showMessage Dialog()

    i make this simple code

    public class Main {

    public static void main(String[] args) {
    JFrame frame = new JFrame();
    frame.setVisible(true);
    frame.setSize(400, 500);
    JOptionPane.showMessageDialog(null, "test");



    }
    }

    i can't see any changes if my argument is null or frame
    i want some help to understand this argument please ??

  4. #4
    PhHein's Avatar
    PhHein is offline Senior Member
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    Click the JFrame while the JOptionPane is visible, once with the null parameter and once with frame as the first parameter.
    Math problems? Call 1-800-[(10x)(13i)^2]-[sin(xy)/2.362x]
    The Ubiquitous Newbie Tips

  5. #5
    jperson is offline Member
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    i see JOptionPane inside the JFrame when i use JOptionPane.showMessageDialog(frame, "test");

    i think that's the difference

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