/** the problem is that if you place ANY window ON TOP of the the java2d app window that this program *runs - when you ALT-tab inbetween, the colors change *this does NOT just happen with Colors and Java2d, if you use Random to generate a "coordinate position" for instance *the COORDs themselves will change each time you ALT Tab *do not understand what to do here */package ran2dprob;import java.awt.Color;import java.awt.Graphics;import java.awt.Graphics2D;import java.awt.Image;import java.awt.Rectangle;import java.awt.image.BufferedImage;import java.awt.image.PixelGrabber;import java.awt.geom.GeneralPath;import javax.swing.JFrame;import java.awt.geom.Ellipse2D;import java.awt.GradientPaint;public class Ran2dProb extends JFrame { public Ran2dProb() { super( "Java2d redraw problem when using Random" ); setSize( 200, 150 ); setVisible( true ); } public void paint( Graphics g ) { super.paint( g ); Graphics2D graphics2D = ( Graphics2D ) g; for ( int count = 1; count <= 2; count++ ) { graphics2D.setColor( new Color( ( int ) ( Math.random() * 256 ), ( int ) ( Math.random() * 256 ), ( int ) ( Math.random() * 256 ) ) ); count++; } graphics2D.fillRect(50,50,90,50); } public static void main( String args[] ) { Ran2dProb application = new Ran2dProb(); application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE ); }}