Snake Game in Java Random Color Generator Error

/*In my code I tried to make my snake change color each time game starts, but it didn't happen like I guessed.When I run the code snake's body change like rainbow in every second.I only want it to change before game starts can someone help me ? */

case SnakeBody:

        Random rand = new Random();


        Color onlycolor = new Color(rand.nextInt(256), rand.nextInt(100), rand.nextInt(100));


        g.setColor(onlycolor);
        g.fillRect(x, y, TILE_SIZE, TILE_SIZE);
        break;