线程安全之lock的使用

public class Test95 {
    public static void main(String[] args) {
        Window95 w=new Window95();
        Thread t1=new Thread(w);
        Thread t2=new Thread(w);
        Thread t3=new Thread(w);
        //为线程命名
        t1.setName("线程1");
        t2.setName("线程2");
        t3.setName("线程3");
        //启动线程
        t1.start();
        t2.start();
        t3.start();
    }
}

import java.util.concurrent.locks.ReentrantLock;

public class Window95 implements Runnable{
    ReentrantLock lock=new ReentrantLock();
    private int age=500;
    @Override
    public void run() {
        while (true){
            try {
                lock.lock();
                if (age<550){
                    try {
                        Thread.sleep(35);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                    System.out.println(Thread.currentThread().getName()+":"+age);
                    try {
                        Thread.sleep(25);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                    age++;
                }else {
                    break;
                }
            }finally {
                lock.unlock();
            }

        }
    }
}