When setLocation() moves a Frame or a Window, they
redraw. They didn't in the April 8th release of JDK1.1.2. but 1.1.2D.

Run the following code and hit RETURN on Frame to observe a problem.

// Sample Program for JDK1.1.2D bug
// When setLocation() moves a Frame or a Window, they redraw

import java.awt.*;
import java.awt.event.*;

public class WndTest extends Frame{
        
        static final Color[] colors = {Color.red,Color.green,Color.blue};
        
        static final int[] xxx = {100,110,120,130,140};
        static final int[] yyy = {100,110,120,130,140};
        int index = 0;
        public WndTest(){
                enableEvents(AWTEvent.KEY_EVENT_MASK|AWTEvent.WINDOW_EVENT_MASK);
        }
        
        public void paint(Graphics gc){
                Dimension size = getSize();
                Insets insets = getInsets();
                Dimension rsize = new Dimension(size.width - (insets.left+insets.right),
                                                                                size.height - (insets.top+insets.bottom));
                
                for(int ii = 0; ii < colors.length; ii++){
                        gc.setColor(colors[ii]);
                        gc.fillOval(insets.left, insets.top,rsize.width, rsize.height);
                        try{
                                Thread.currentThread().sleep(200);
                        }catch(Exception e){}
                }
        }
        
        public void processKeyEvent(KeyEvent ev){
                if(ev.getID() == KeyEvent.KEY_PRESSED){
                        if(ev.getKeyCode() == KeyEvent.VK_ENTER){
                                ++index;
                                if(index >= xxx.length)
                                        index = 0;
                                setLocation(xxx[index], yyy[index]);
                        }
                }
        }
        public void processWindowEvent(WindowEvent ev){
                if(ev.getID() == WindowEvent.WINDOW_CLOSING)
                        System.exit(0);
                super.processWindowEvent(ev);
        }

        public static void main(String args[]){
                WndTest me = new WndTest();
                me.pack();
                me.setBounds(100,100,400,400);
                me.setVisible(true);
        }
}