public Queue(Class namaClass, Integer size) {
    pointer = -1;
    sizeArray = size;
    element = (T[]) Array.newInstance(namaClass, size);
}

public void enqueue(T data)
{
    if(pointer < (sizeArray - 1))
    {
        pointer++;
        element[pointer] = data;
    }
    else
    {
        System.out.println("Queue Sudah Penuh");
    }
}

public void dequeue()
{
    if(pointer >= 0) {
        for (Integer i = 0; i <= pointer; i++) {
            element[i] = element[i + 1];
        }
        pointer--;
    }
    else
    {
        System.out.println("Queue Sudah Kosong");
    }
}
public void viewQueue()
{
    for(Integer i = 0; i <= pointer; i++)
    {
        System.out.print(element[i]);
        System.out.print(" ");
    }
}

public void clearQueue()
{
    pointer = -1;
}

public static void main(String[] args)
{
    Integer pil;
    Queue queue = new Queue<>(String.class, 10);
    Scanner scanner = new Scanner(System.in);

    do
    {
        queue.viewQueue();
        System.out.println();
        System.out.println("1. Enqueue");
        System.out.println("2. Dequeue");
        System.out.println("3. Clear");
        System.out.println("4. Exit");
        pil = scanner.nextInt();
        if(pil > 0 && pil < 4)
        {
            switch (pil) {
                case 1:
                    String data;
                    System.out.print("Masukkan Data: ");
                    data = scanner.next();
                    queue.enqueue(data);
                    break;
                case 2:
                    queue.dequeue();
                    break;
                case 3:
                    queue.clearQueue();
                    break;
                default:
                    break;
            }
        }
        else
            break;
    }while(true);
}