private static String getRandomColor(){
        String randomColor = null;
        switch (getRandomNumber(1, 7)){
            case 1:
                randomColor = "Red";
                break;
            case 2:
                randomColor = "Orange";
                break;
            case 3:
                randomColor = "Yellow";
                break;
            case 4:
                randomColor = "Green";
                break;
            case 5:
                randomColor = "Blue";
                break;
            case 6:
                randomColor = "Dark blue";
                break;
            case 7:
                randomColor = "Violet";
                break;
        }
        return randomColor;
    }