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Thread: main error

  1. #1
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    Default main error

    I've written code to draw a rectangle. I'm pretty sure i did everything right. This is my code:

    package hmm;
     
    import javax.swing.*;
    import java.awt.*;
    import java.awt.event.*;
     
    public class Hmm {
    private static class drawrectangle extends JPanel {
        public void paintComponent(Graphics g) {
        super.paintComponent(g);
                g.drawRect(50, 50, 50, 50);
    }
    }
     
        public static void main(String[] args) {
          drawrectangle displayPanel = new drawrectangle();
          JPanel content = new JPanel();
          content.add(displayPanel);
          JFrame window = new JFrame();
          window.setContentPane(content);
          window.setVisible(true);
        }
    }

    However whenever i try to run it i get this error:
    "java.lang.NoSuchMethodError: main
    Exception in thread "main" Java Result: 1"

    I'm don't know what this means. Also, I compiled this code using NetBeans IDE.


  2. #2
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    Default Re: main error

    I compiled your code and it is working.
    restart your IDE
    sometimes helps!
    give a backgroud color to differ your panels.

  3. The Following User Says Thank You to serdar For This Useful Post:

    Shivam24 (August 29th, 2011)

  4. #3
    Super Moderator Norm's Avatar
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    Default Re: main error

    What happens if you open a command prompt, change to the folder with the Hmm.class file and enter:
    java Hmm

  5. #4
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    Default Re: main error

    all i needed to was restart the IDE. Thanks

  6. #5
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    Default Re: main error

    Restarting the IDE may not have been necessary. Doing a clean and build might have resolved the problem.
    Improving the world one idiot at a time!

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