public class CycleArrayQueue
{
    private static final String TAG = "CycleArrayQueue";
    private Object[] queue;
    private int SIZE = 10;//初始化大小
    private int front = 0;
    private int rear = 0;
    private int usesize = 0;

    public CycleArrayQueue()
    {
        queue = new Object[SIZE];
    }

    public
 
 boolean isEmpty()
    {
        return Math.abs(rear - front + SIZE) % SIZE == 0;
    }

    public int getSize()
    {
        return (Math.abs(rear - front + SIZE) % SIZE);
    }

    public void insert(Object obj) throws Exception
    {
        if ((rear + 1) % SIZE == front) throw new Exception("棧已滿！"
 
);
        queue[(rear % SIZE)] = obj;
        rear = (rear + 1) % SIZE;
        usesize++;
    }

    public void delete() throws Exception
    {
        if ((front + 1) % SIZE == rear) throw new Exception("空棧！");
        queue[(front % SIZE)] = null;
        front = (front + 1) % SIZE;
        usesize--;
    }

    public
 
 void display() throws Exception
    {
        if (usesize == 0) throw new Exception("空佇列！");
        if (rear >= front)
        {
            for (int i = front; i < rear; i++)
            {
                System.out.print(queue[i] + "<-");
            }
        } else
        {
            for (int i = front; i < SIZE; i++)
            {
                System.out.print(queue[i] + "<-");
            }
            for (int i = 0; i < rear; i++)
            {
                System.out.print(queue[i] + "<-");
            }
        }
        System.out.println("");
    }

    public static void main(String[] args) throws Exception
    {
        CycleArrayQueue caq = new CycleArrayQueue();
        caq.insert("123");
        caq.insert("==");
        caq.insert("tt123");
        caq.insert("gg");
        caq.display();
        System.out.println(caq.getSize());
        caq.delete();
        caq.delete();
        caq.insert("1=");
        caq.insert("2=");
        caq.insert("3=");
        caq.insert("4=");
        caq.insert("5=");
        caq.insert("6=");
        caq.insert("7=");
//        caq.insert("8=");
//        caq.insert("op=");
        caq.display();

    }
}