Java数据结构之循环队列简单定义与用法示例

package com.java.queue;
/**
 * @描述 对列
 * @项目名称 Java_DataStruct
 * @包名 com.java.stack
 * @类名 Queue
 * @author chenlin
 * @version 1.0
 * @SVN $Rev$
 */
public class CycleQueue {
 private long[] arr;
 private int maxSize;// 最大空间
 private int len;// 有效长度
 private int head;// 队头
 private int end;// 队尾
 public CycleQueue(int size) {
 this.maxSize = size;
 this.arr = new long[maxSize];
 this.len = 0;
 this.head = 0;
 this.end = -1;
 }
 /**
 * 从队尾插入数据
 *
 * @param value
 */
 public void insert(long value) {
 //如果满了,为什么是maxSize - 1 ,因为从-1开始
 if (end == maxSize - 1) {
  end = -1;
 }
 arr[++end] = value;
 len++;
 }
 /**
 * 从队头移除数据
 */
 public long remove() {
 long result = arr[head++];
 if (head == maxSize) {
  head = 0;
 }
 len--;
 return result;
 }
 /**
 * 判断是否为空
 *
 * @return
 */
 public boolean isEmpty() {
 return (len == 0);
 }
 /**
 * 判断是否满了
 *
 * @return
 */
 public boolean isFull() {
 return (len == maxSize);
 }
 /**
 * 获得队列的有效长度
 *
 * @return
 */
 public int size() {
 return len;
 }
 public static void main(String[] args) {
 CycleQueue queue = new CycleQueue(50);
 queue.insert(22);
 queue.insert(33);
 queue.insert(44);
 queue.insert(534);
 queue.insert(21);
 queue.insert(55);
 System.out.println("测试结果：");
 while (!queue.isEmpty()) {
  System.out.print(queue.remove() + " ");
 }
 System.out.println();
 queue.insert(33);
 queue.insert(13);
 queue.insert(23);
 while (!queue.isEmpty()) {
  System.out.print(queue.remove() + " ");
 }
 }
}