jQuery火箭图标返回顶部代码

public class ArrayQueue
{
    private static final String TAG = "ArrayQueue";
    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 ArrayQueue()
    {
        queue = new Object[SIZE];
    }

    public boolean isEmpty()
    {
        return (rear - front) == 0;
    }

    public int getSize()
    {
        return rear - front;
    }

    public void insert(Object obj) throws Exception
    {
        if (front > rear || rear > SIZE) throw new Exception("无法进入队列！");
        if (((rear - front) + 1) % SIZE == 0) throw new Exception("队列已满！");
        queue[rear] = obj;
        rear++;
        usesize++;
    }

    public void delete() throws Exception
    {
        if (front >= rear || rear > SIZE) throw new Exception("无法删除！");
        queue[front] = null;
        front++;
        usesize--;
    }

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

    public static void main(String[] args) throws Exception
    {
        ArrayQueue aq = new ArrayQueue();
        aq.insert("123");
        aq.insert("qwe");
        aq.insert("tt");
        aq.insert("h8h0-----=1ew");
        System.out.println(aq.queue[0]);
        System.out.println(aq.queue[1]);
        System.out.println(aq.queue[2]);
        System.out.println(aq.queue[3]);
        System.out.println(aq.getSize());
        aq.display();
    }


}