java多线线程停止正确方法

//军队线程
//模拟作战双方的行为
public class ArmyRunnable implements Runnable { //volatile保证了线程可以正确的读取其他线程写入的值
//可见性 ref JMM， happens-before原则
volatile boolean keepRunning = true; @Override
public void run() {
while(keepRunning){
//发动5连击
for(int i=0;i<5;i++){
System.out.println(Thread.currentThread().getName()+"进攻对方["+i+"]");
//让出了处理器时间，下次该谁进攻还不一定呢！
Thread.yield();
} } System.out.println(Thread.currentThread().getName()+"结束了战斗！"); }}

package com.wistron.swpc.ecs.util;public class KeyPersonThread extends Thread { public void run(){
System.out.println(Thread.currentThread().getName()+"开始了战斗！");
for(int i=0;i<10;i++){
System.out.println(Thread.currentThread().getName()+"左突右杀,攻击隋军...");
}
System.out.println(Thread.currentThread().getName()+"结束了战斗！");
}
}

package com.wistron.swpc.ecs.util;/**
* 隋唐演义大戏舞台
*/
public class Stage extends Thread { public void run(){ System.out.println("欢迎观看隋唐演义");
//让观众们安静片刻，等待大戏上演
try {
Thread.sleep(5000);
} catch (InterruptedException e1) {
e1.printStackTrace();
}
System.out.println("大幕徐徐拉开"); try {
Thread.sleep(5000);
} catch (InterruptedException e1) {
e1.printStackTrace();
} System.out.println("话说隋朝末年，隋军与农民起义军杀得昏天黑地..."); ArmyRunnable armyTaskOfSuiDynasty = new ArmyRunnable();
ArmyRunnable armyTaskOfRevolt = new ArmyRunnable(); //使用Runnable接口创建线程
Thread armyOfSuiDynasty = new Thread(armyTaskOfSuiDynasty,"隋军");
Thread armyOfRevolt = new Thread(armyTaskOfRevolt,"农民起义军"); //启动线程，让军队开始作战
armyOfSuiDynasty.start();
armyOfRevolt.start(); //舞台线程休眠，大家专心观看军队厮杀
try {
Thread.sleep(50);
} catch (InterruptedException e) {
e.printStackTrace();
} System.out.println("正当双方激战正酣，半路杀出了个程咬金"); Thread mrCheng = new KeyPersonThread();
mrCheng.setName("程咬金"); System.out.println("程咬金的理想就是结束战争，使百姓安居乐业！"); //停止军队作战
//停止线程的方法
armyTaskOfSuiDynasty.keepRunning = false;
armyTaskOfRevolt.keepRunning = false; try {
Thread.sleep(2000);
} catch (InterruptedException e) {
e.printStackTrace();
} /*
* 历史大戏留给关键人物
*/
mrCheng.start(); //万众瞩目，所有线程等待程先生完成历史使命
try {
mrCheng.join();
} catch (InterruptedException e) {
e.printStackTrace();
} System.out.println("战争结束，人民安居乐业，程先生实现了积极的人生梦想，为人民作出了贡献！");
System.out.println("谢谢观看隋唐演义，再见！"); } public static void main(String[] args) {
new Stage().start(); }}