学习队列结构

痛定思痛。 2022-07-18 16:28 35阅读 0赞

package com.loong.datastructure;
    
    /** * 学习队列结构 * * @author Loong * */
    public class Queue { 
        private Object[] item = new Object[100];
        private int front;// 对头
        private int rear;// 队尾
        private int count;
    
        public Queue() {
    
        }
    
        /** * 初始化队列 */
        public void initQueue() {
            front = rear = count = 0;
        }
    
        /** * 判断队列是否为空 * * @return */
        public boolean isQueueEmpty() {
            return count == 0;
        }
    
        /** * 判断队列是否已满 * * @return */
        public boolean isQueueFull() {
            return count == item.length;
        }
    
        /** * 进队列 * * @param o */
        public void enQueue(Object o) {
            if (isQueueFull()) {
                throw new RuntimeException("队列已满");
            }
    
            if (rear >= this.item.length) {
                if (count < this.item.length) {
                    rear = 0;
                }
            }
    
            item[rear++] = o;
            count++;
        }
    
        /** * 获取队首元素 * * @return */
        public Object getFront() {
            if (isQueueEmpty()) {
                throw new RuntimeException("队列为空");
            }
            return this.item[front];
        }
    
        /** * 出队列 * * @return */
        public Object deQueue() {
            if (isQueueEmpty()) {
                throw new RuntimeException("队列为空");
            }
            Object o = null;
    
            if (front > this.item.length - 1) {
                front = 0;
            }
    
            o = this.item[front];
            this.item[front++] = null;
            count--;
            return o;
        }
    
    }