package com.mooc.threadpractice;


import java.util.concurrent.TimeUnit;

public class Test1 {
    static boolean isStop = false;

    public static void main(String[] args) throws InterruptedException {
        Thread newThread = new Thread(new Runnable() {
            @Override
            public void run() {
                int i = 0;
                while (!isStop) {
                    i++;
                    System.out.println("i:"+i);
                }
            }
        });
        newThread.start();
        TimeUnit.SECONDS.sleep(1);
        isStop = true;

    }
}

class Test2 implements Runnable {
    static boolean isStop = false;

    public static void main(String[] args) throws InterruptedException {
        Test2 instance = new Test2();
        Thread newThread = new Thread(instance);
        newThread.start();
        TimeUnit.SECONDS.sleep(1);
        isStop = true;
    }


    @Override
    public void run() {
        int i = 0;
        while (!isStop) {
            i++;
        }
    }

}

为什么加上system.out.println一个能终止，一个不能终止？