queue.java

来自「项目支付宝批量打款,采用httpclient+spring +quarz实现.」· Java 代码 · 共 55 行

package com.szhelper.pay.quartz.util;

/**
 * 实现先进先出的队列工具类
 * <p>Title: Pay Proxy</p>
 * <p>Description: Short Message Proxy</p>
 * <p>Copyright: Copyright (c) 2006</p>
 * <p>Company: New Unaction</p>
 * @author Fang
 * @version 1.0
 */
import java.util.EmptyStackException;
import java.util.Vector;

/**
 * 
 * @author Fang
 * @version 1.0
 * @date 2008-08-07
 */
public class Queue extends Vector implements java.io.Serializable {
	private static final long serialVersionUID = 1224463164541331325L;

	public Queue() {
	}

	public Object push(Object item) {
		addElement(item);
		return item;
	}

	public synchronized Object pop() {
		Object obj;
		int len = size();

		obj = peek();
		removeElementAt(0);

		return obj;
	}

	public synchronized Object peek() {
		int len = size();

		if (len == 0) {
			throw new EmptyStackException();
		}
		return elementAt(0);
	}

	public boolean empty() {
		return size() == 0;
	}
}