Improve scrolling in graphics

Question

Here is some code
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
public class junk extends JFrame implements MouseMotionListener  {
  junkit ju = new junkit();
   public junk() {
    super();
    setSize(530,550);
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    Container pane = getContentPane();
    FlowLayout flow = new FlowLayout();
    pane. addMouseMotionListener(this);
    pane.add(ju);   
    setVisible(true); 
   public void mouseMoved(MouseEvent me) {
     ju.runner = null;
     System.exit(0);
   public void mouseDragged(MouseEvent me) {}
   public static void main(String[] args) {
    junk test = new junk();
class junkit extends JPanel implements Runnable{
Thread runner,runner1;
   int y1 = 0;
  int x1 =  30;
  Image dear;
  public junkit() {
   Toolkit kit = Toolkit.getDefaultToolkit();
   dear = kit.getImage("dear.gif");
  runner = new Thread(this);
  runner.start();
public void paintComponent(Graphics g1) {
   Graphics2D d2 = (Graphics2D)g1;
  GradientPaint gg1 = new  GradientPaint(30,30,Color.blue,30,
                     300,
                  Color.white);
    d2.setPaint(gg1);
    d2.fillRect(0,0,530,550);
    d2.setPaint(Color.white);
    d2.fillArc(x1,y1,30,30,0,360);
    d2.drawImage(dear,100,300,200,200,this);
  public void run() {
  Thread thisthread = Thread.currentThread();
  while(runner == thisthread) {
    y1++;
    if(y1 > 400){y1=0;}
    repaint();
   try{ Thread.sleep(1); }
    catch(Exception ee) {ee.printStackTrace();}
}The problem is when it is scrolling down there is a pause for like a sec then it starts for alittle more the it pauses agian and so on. I dont know y this is doing this could you explain and tell me how I can inprove on this.Also I am on linux and I have tried diffrent things but it is still there.Thank you for any help you give

Answer 1

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question1
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hi,
I just tried your program, but everything seems to be working fine without any problem. But, one thing, as soon as the frame loads a small flicker takes place, this could be because as you are drawing an image on the frame, the frame takes a small amount of time for the image to be visible. Also, as the run() method uses repaint, the image might flicker every one or two seconds as you mentioned.
Regards,
Balaji.SN