在多线程开发。除了synchronized这个keyword外，我们还通过Lock接口来实现这样的效果。由Lock接口来实现

这样的多线程加锁效果的优点是非常的灵活，我们不在须要对整个函数加锁，并且能够非常方便的把他放在我们函数的不论什么

一个地方，很的称心，并且从效率上来说。使用Lock接口要比使用synchronizedkeyword效率高一些，以下我们来使用

一个样例来说明这样的方法的使用。

package com.bird.concursey.charpet3;public class Job implements Runnable {	private PrintQueue printQueue;	public Job(PrintQueue printQueue) {		this.printQueue = printQueue;	}	@Override	public void run() {		System.out.printf("%s: Going to print a document\n", Thread				.currentThread().getName());		printQueue.printJob(new Object());		System.out.printf("%s: The document has been printed\n", Thread				.currentThread().getName());	}}

package com.bird.concursey.charpet3;import java.util.concurrent.locks.Lock;import java.util.concurrent.locks.ReentrantLock;public class PrintQueue {		private final Lock queueLock = new ReentrantLock();		public void printJob(Object document) {		queueLock.lock();		Long duration=(long)(Math.random() * 10000);		System.out.println(Thread.currentThread().getName()+ ":PrintQueue: Printing a Job during "+(duration/1000)+" seconds");		try {			Thread.sleep(duration);		} catch (InterruptedException e) {			e.printStackTrace();		}finally{			queueLock.unlock();		}	}		public static void main(String[] args) {		PrintQueue printQueue = new PrintQueue();		Thread thread[] = new Thread[10];		for(int i = 0; i < 10; i++) {			thread[i] = new Thread(new Job(printQueue), "Thread " + i);		}		for(int i = 0; i < 10; i++) {			thread[i].start();		}	}}

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