使用violate关键字解决了变量的可见性问题（volatile让多线程刷新falg的值）
package com.cppdy;
class MyThread11 extends Thread {
//volatile让多个线程刷新falg的值
public volatile boolean falg = true;
@Override
public void run() {
System.out.println("子线程开始执行啦");
while (falg) {
}
System.out.println("子线程结束执行啦");
}
public void setFalg(boolean falg) {
this.falg=falg;
System.out.println("falg的值："+this.falg);
}
}
public class ThreadDemo11 {
public static void main(String[] args) throws Exception {
MyThread11 mt = new MyThread11();
mt.start();
Thread.sleep(1000);
mt.setFalg(false);
System.out.println("主线程结束啦");
}
}
当更改falg的值，volatile会更新其它线程falg的值