поправка на код

} else if (commandName.equals("Shift") && commandParts[1].equals("left")) {
    int leftCount = Integer.parseInt(commandParts[2]);
    for (int i = 0; i < leftCount; i++) {
        int firstElement = numbers.get(0);
        numbers.remove(0);
        numbers.add(firstElement);
    }
} else if (commandName.equals("Shift") && commandParts[1].equals("right")) {
    int rightCount = Integer.parseInt(commandParts[2]);
    for (int i = 0; i < rightCount; i++) {
        int lastNumber = numbers.get(numbers.size() - 1);
        numbers.remove(numbers.size() - 1);
        numbers.add(0, lastNumber);
    }
}