Java队列数据结构的实现

public class Queue {
    private int maxSzie; //队列中能存储的最大个数
    private int frontPoint; //头指针指向队头
    private int rearPoint; //尾指针指向队尾的后一个数据
    private int[] array; //模拟队列的数组

    /**
     * 初始化队列
     */
    public Queue(int max) {
        maxSzie = max;
        frontPoint = 0;
        rearPoint = 0;
        array = new int[max];
    }

    /**
     * 判断队列是否为空
     */
    public boolean isEmpty(){
        return frontPoint == rearPoint;
    }
    /**
     * 判断队列是否已满
     */
    public boolean isFull(){
        return (rearPoint+1)%maxSzie == frontPoint;
    }
    /**
     * 向队列中添加数据
     */
    public void add(int x){
        if (isFull()){
            System.out.println("当前队列已满");
            return;
        }
        //添加数据
        array[rearPoint] = x ;
        //后移尾指针
        rearPoint = (rearPoint+1) % maxSzie;
        System.out.println("添加成功");
    }
    /**
     * 取出队列中的数据
     */
    public int remove(){
        if (isEmpty()){
            throw new RuntimeException("当前队列为空");
        }
        //把队头的值赋值给临时变量
        int x = array[frontPoint];
        //移除数据后头指针需要向后移动 时其指向新的队头
        frontPoint = (frontPoint+1) % maxSzie;
        System.out.println("移除成功");
        return x;
    }
    /**
     * 获取队列头数据
     */
    public int gethead(){
        if (isEmpty()){
            throw new RuntimeException("当前队列为空");
        }
        return array[frontPoint];
    }
    /**
     * 遍历队列
     */
    public void show(){
        int x = 0;
       for (int i = frontPoint; i <= (rearPoint+maxSzie-frontPoint)%maxSzie; i++) {
            x++;
            System.out.println("队列的第"+x+"个数据是"+array[i]);
        }
    }
}

public class QueueTest {
    public static void main(String[] args) {
        Queue queue = new Queue(5);
        Scanner scanner = new Scanner(System.in);
        char systemIn = ' ';
        boolean noEnd = true;
        while (noEnd){
            System.out.println("a:add(添加数据)");
            System.out.println("r:remove(删除数据)");
            System.out.println("h:head(获取队头)");
            System.out.println("s:show(遍历队列)");
            System.out.println("e:exit(退出程序)");
            System.out.println("请输入字符");
            systemIn = scanner.next().charAt(0);
            switch (systemIn){
                case 'a':
                    System.out.println("请输入入队的数据(数字)");
                    int x = Integer.parseInt(scanner.next());
                    queue.add(x);
                    break;
                case 'r':
                    queue.remove();
                    break;
                case 'h':
                    int head = queue.gethead();
                    System.out.println("队头是"+head);
                    break;
                case 's':
                    queue.show();
                    break;
                case 'e':
                    noEnd = false;
                    break;
            }
        }
    }
}