Java多线程的~~~Lock接口和ReentrantLock使用

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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