update

src/main/java/PingPong/Ball.java

@@ -34,4 +34,8 @@ Random random;
         x += xVelocity;
         y += yVelocity;
     }
+    public void draw(Graphics g){
+        g.setColor(Color.red);
+        g.fillOval(x, y, width, height);
+    }
 }