refactoring:

src/main/java/PingPong/Ball.java

@@ -44,7 +44,11 @@ Random random;
         y += yVelocity;
     }
     public void draw(Graphics g){
-        g.setColor(Color.red);
+        Color(g);
         g.fillOval(x, y, width, height);
     }
+
+    private static void Color(Graphics g) {
+        g.setColor(Color.red);
+    }
 }