【JAVA-线程】线程的同步Lock

【JAVA-线程】线程的同步Lock
1实例化ReentrantLock

private ReentrantLock lock =new ReentrantLock();

2.把需要控制的代码块放到try-finally中
在try里的第一句代码为lock.lock();
在finally里的代码为 lock.unlock()

try {
lock.lock();
} finally {
	lock.unlock();
}

代码：

import java.util.concurrent.locks.ReentrantLock;

class Window implements Runnable{
	private ReentrantLock lock = new ReentrantLock();
	private int n =100;
	@Override
	public void run() {
		// TODO Auto-generated method stub
		while(true) {
			try {
				//2调用lock方法
				lock.lock();
				if(n>0) {
					try {
						Thread.sleep(500);
					} catch (InterruptedException e) {
						// TODO Auto-generated catch block
						e.printStackTrace();
					}
					System.out.println(Thread.currentThread().getName()+"..."+
							n);
					n--;
				}else {
					break;
				}
			} finally {
				//3调用 unlock（）
				lock.unlock();
			}
		}
	}
}
public class LockDemo {
	public static void main(String[] args) {
		Window w =new Window();
		new Thread(w,"t1").start();
		new Thread(w,"t2").start();
		new Thread(w,"t3").start();

	}
}

Synchronized 和 Lock 对比
【JAVA-线程】线程的同步Lock