多线程之线程安全

public class Test94 {
    public static void main(String[] args) {
        Window94 w1=new Window94();
        Window94 w2=new Window94();
        Window94 w3=new Window94();
        //设置线程
        w1.setName("线程1");
        w2.setName("线程2");
        w3.setName("线程3");
        //启动线程
        w1.start();
        w2.start();
        w3.start();
    }
}

//回顾复习过往知识点
public class Window94 extends Thread{
    private static int age=500;
    static Object object=new Object();
    @Override
    public void run() {
        while (true){
            synchronized (object){
                if (age<550){
                    try {
                        Thread.sleep(30);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                    System.out.println(Thread.currentThread().getName()+":"+age);
                    try {
                        Thread.sleep(30);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                    age++;
                }else {
                    break;
                }
            }
        }
    }
}