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Thread: OutOfMemoryError (Java heap space)

  1. #1
    Java kindergarten chronoz13's Avatar
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    Default OutOfMemoryError (Java heap space)

    whats wrong with this error?


    [COLOR="Red"]Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
            at java.util.Arrays.copyOf(Arrays.java:2760)
            at java.util.Arrays.copyOf(Arrays.java:2734)
            at java.util.ArrayList.ensureCapacity(ArrayList.java:167)
            at java.util.ArrayList.add(ArrayList.java:351)
            at java.awt.Container.addImpl(Container.java:1054)
            at java.awt.Container.add(Container.java:365)
            at xTestx.NewMain.main(NewMain.java:69)[/COLOR]



    this is the code

    package xTestx;
     
    import javax.swing.JFrame;
    import javax.swing.JPanel;
    import java.awt.Color;
    import java.awt.Graphics;
    import java.awt.Container;
     
    /**
     *
     * @author
     */
     
    public class NewMain {
     
        public static void main(String[] args) {
     
            JFrame window;
            Container container;
     
            window = new JFrame();
            window.setSize(400, 400);
            window.setLocation(200, 300);
            window.setVisible(true);
     
            while (true) {
     
                JPanel panel = new JPanel() {
                Color color;
     
                    @Override
                    public void paintComponent(Graphics g) {
     
                        super.paintComponent(g);
     
                        int x = (int) (Math.floor(Math.random() * 3) + 1);
     
                        switch (x) {
     
                            case 1:
     
                                color = Color.BLACK;
                                break;
     
                            case 2:
     
                                color = Color.BLUE;
                                break;
     
                            case 3:
     
                                color = Color.GREEN;
                                break;
     
                            default:
     
                                color = Color.PINK;
                                break;
                        }
     
     
                        g.setColor(color);
                        g.fillRect(50, 50, 50, 50);
                    }
                };
     
                container = window.getContentPane();
                container.add(panel);
            }
        }
    }


    i just to make a simple program that demonstrates a shape that continuesly change color while running..


  2. #2
    Administrator copeg's Avatar
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    Default Re: OutOfMemoryError (Java heap space)

    The problem with the code posted is that you are continuously creating JPanels in a while loop and keeping a reference to those JPanels by calling the add, so it'll eventially max out. You should do this another way, such as creating a SwingTimer to update a single JPanel after a certain interval (How to Use Swing Timers (The Java™ Tutorials > Creating a GUI With JFC/Swing > Using Other Swing Features))
    Somwthing along the lines like this:
    public class NewMain extends JPanel implements ActionListener{
     
    	public static void main(String args[]){
    		NewMain nm = new NewMain();
     
    		SwingTimer timer = new SwingTimer( 60, nm );//update every 60 milliseconds
    		timer.start();
    	}
     
    	public void actionPerformed(ActionEvent e){
    		////do the drawing then call repaint()
    	}
    }

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

    chronoz13 (November 21st, 2009)

  4. #3
    Java kindergarten chronoz13's Avatar
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    Default Re: OutOfMemoryError (Java heap space)

    hmm i like that one.. tnx for that sir... im gonna post any further questions if i encounter some problems again

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