swing - Blinking in JFrame Java

Question

Hello guys I am doing a thread to update a ball over JFrame so I repaint the screen... and then paint the ball update its position .. and then draw the screen again ... draw the ball and the same cycle ... here is the code

private void jButton3ActionPerformed(java.awt.event.ActionEvent evt) {
   Thread t = new Thread()
   {
     public void run()
     {
         while(true)
         {
             repaint();
             b2.update(ob,2);
             b2.paint(ob.getGraphics());

             b2.setT(b2.getT() + 1);
             try {
                 Thread.sleep(50);
             } catch (InterruptedException ex) {
                 System.out.println("Error in Sleeping");
             }

         }
     }
   };

   t.start();
}

but the problem is that I don't see the ball... the paint of the screen always overrides the ball and the ball is like down under the Jframe ..

Answer 1

If you want to have animations in Swing, the recommended class to use is the javax.swing.Timer . This class allows you to perform operations on the Event Dispatch Thread at regular intervals.

• The Swing Timer tutorial
• An animation example posted here on SO (which is linked in the Swing wiki here on SO btw)