update

src/main/java/PingPong/GamePanel.java

@@ -18,6 +18,8 @@ public class GamePanel extends JPanel implements Runnable {
     Paddle paddle_1;
     Paddle paddle_2;
     Score score;
+    Image image;
+    Graphics graphics;
 
     public void run() {
 
@@ -30,6 +32,12 @@ public class GamePanel extends JPanel implements Runnable {
         ball.draw(g);
 
     }
+    public void paint(Graphics g) {
+        image = createImage(getWidth(), getHeight());
+        graphics = image.getGraphics();
+        draw(graphics);
+        g.drawImage(image, 0, 0, this);
+    }
 
     public void newBall() {