jdk1.5的线程锁技术

/**
 * LockTest.java
 * cn.com.songjy.test.socket.thread
 * Function： TODO 
 *
 *   version    date      author
 * ──────────────────────────────────
 *   	1.0	 2013-8-169    songjy
 *
 * Copyright (c) 2013, TNT All Rights Reserved.
 */

package cn.com.songjy.test.socket.thread;

import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * ClassName:LockTest
 * java5的线程锁技术
 * 
 * @author songjy
 * @version 1.0
 * @since v1.0
 * @Date 2013-8-19 上午10:22:22
 */

public class LockTest {

	private static Log log = LogFactory.getLog(TraditionalThread.class);

	public static void main(String[] args) {
		new LockTest().init();
	}

	private void init() {

		final OutPuter outPuter = new OutPuter();

		new Thread(new Runnable() {

			@Override
			public void run() {
				while (true) {
					try {
						Thread.sleep(10);
					} catch (InterruptedException e) {
						log.error(e.getMessage(), e);
					}
					outPuter.output("1111111111111111111111111111");
				}
			}
		}).start();
		
		new Thread(new Runnable() {

			@Override
			public void run() {
				while (true) {
					try {
						Thread.sleep(10);
					} catch (InterruptedException e) {
						log.error(e.getMessage(), e);
					}
					outPuter.output("2222222222222222222222222222");
				}
			}
		}).start();
	}

	static class OutPuter {
		
		Lock lock = new ReentrantLock();
		
		public void output(String name) {// 一个一个打印字符串中的字符到控制台，重新组成完整的字符串，若不完整，说明没有同步，线程不安全
			int len = name.length();
			/*synchronized (this) {
				for (int i = 0; i < len; i++) {
					System.out.print(name.charAt(i));
				}
				System.out.println();
			}*/
			
			//以下代码与上述注释掉的代码效果一样，但大并发时效率上可能差了一点
			lock.lock();
			try {
				for (int i = 0; i < len; i++) {
					System.out.print(name.charAt(i));
				}
				System.out.println();
			} catch (Exception e) {
				log.error(e.getMessage(), e);
			} finally {
				lock.unlock();//即使程序错误也要确保锁的释放（不要占着茅坑不拉屎，那怕晕倒在茅坑！(*^__^*) 嘻嘻）
			}
		}
	}
}

来自：http://down.51cto.com/data/443430