avoid calls to paint() on resize?

[Shadowdude04]

Hi,
i'm using swing and i've encountered a problem.
When my JFrame gets resize the paint method is called (serveral times), the problem is my paint method is quite large and takes times to calculate. I've heard that i could use a BufferedImage to save the "frame" and then paint it again when my Frame has finished resizing (when componentResized() is called). Although i can't get it to work - therefore i've made a little exampel and was hoping someone could write some code, that saved the image (as a BufferedImage) and when my frame gets rezied nothing happens.

- Thanks in advance

import java.awt.Graphics;
import java.awt.event.ComponentEvent;
import java.awt.event.ComponentListener;

import javax.swing.JFrame;
import javax.swing.JPanel;

public class MainClass extends JFrame{

	draw d;
	int count = 0;
	public MainClass() {
		super("!");
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setSize(300, 200);
		setVisible(true);
		d = new draw();
		add(d); // adds the JPanel
		addComponentListener(new SizeHandler());
	}

	public static void main(String[] args) {
		new MainClass();
	}

	private class SizeHandler implements ComponentListener {
		@Override
		public void componentHidden(ComponentEvent arg0) {
		}

		@Override
		public void componentMoved(ComponentEvent arg0) {
		}

		@Override
		public void componentResized(ComponentEvent arg0) {
			System.out.println("paintLine!");
			d.paintLine();
		}

		@Override
		public void componentShown(ComponentEvent arg0) {
		}

	}

}

class draw extends JPanel{
	 
	public void paintLine()
	{
		repaint();
		System.out.println("invoked");
	}
	@Override
	public void paintComponent(Graphics g) {
			System.out.println("paints");
			g.drawLine(0, 0, getWidth(), getHeight());
		
	}
	
}

Moderator Edit: Code tags added