refactoring:

src/main/java/PingPong/Ball.java

@@ -16,13 +16,18 @@ Random random;
         int randomXDirection = random.nextInt(2);
         if (randomXDirection == 0)
             randomXDirection--;
-        setXDirection(randomXDirection * ballSpeed);
+        xDirect(randomXDirection);
 
         int randomYDirection = random.nextInt(2);
         if (randomYDirection == 0)
             randomYDirection--;
         setYDirection(randomYDirection * ballSpeed);
     }
+
+    private void xDirect(int randomXDirection) {
+        setXDirection(randomXDirection * ballSpeed);
+    }
+
     public void setXDirection (int randomXDirection){
         xVelocity = randomXDirection;
     }