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();
}
}
}