一、题目

二、代码

从这道题的测试用例可以看出这种循环队列font和rear初始化时，font位于-1，rear位于0，和传统的循环队列有点区别。因此刷力扣前，一定要看准测试用例，以免浪费时间。

class MyCircularQueue {
    private int[] queue;

    private int font;

    private int rear = -1;

    private int size;

    private int eleNum;

    public MyCircularQueue(int k) {
        queue = new int[k];
        size = k;
    }

    public boolean enQueue(int value) {
        if (isFull()) {
            return false;
        }
        rear = (rear + 1) % size;
        queue[rear] = value;
        eleNum++;
        return true;
    }

    public boolean deQueue() {
        if (isEmpty()) {
            return false;
        }
        font = (font + 1) % size;
        eleNum--;
        return true;
    }

    public int Front() {
        if (isEmpty()) {
            return -1;
        }
        return queue[font];
    }

    public int Rear() {
        if (isEmpty()) {
            return -1;
        }
        return queue[rear];
    }

    public boolean isEmpty() {
        return eleNum == 0;
    }

    public boolean isFull() {
        return eleNum == size;

    }

    public static void main(String[] args) {
        MyCircularQueue obj = new MyCircularQueue(3);
        boolean param_1 = obj.enQueue(1);
        boolean param_2 = obj.enQueue(2);
        boolean param_3 = obj.enQueue(3);
        boolean param_4 = obj.enQueue(4);
        int rear = obj.Rear();
        boolean isFull = obj.isFull();
        boolean param_5 = obj.deQueue();
        boolean param_6 = obj.enQueue(4);
        int rear_ = obj.Rear();
        System.out.println(param_1 + " " + param_2 + " " + param_3 + " " + param_4 + " " + rear + " " + isFull + " "
            + param_5 + " " + param_6 + " " + rear_);
    }
}