Java并发-9.线程的终止

package com.junzerg.threads;

import java.util.concurrent.TimeUnit;

/**
 * @author pengjunzhe
 */
public class Shutdown {
    public static void main(String[] args) throws InterruptedException {
        Runner one = new Runner();
        Thread countThread = new Thread(one, "CountThread");
        countThread.start();
        // 睡眠1秒，main线程对CountThread进行中断
        TimeUnit.SECONDS.sleep(1);
        countThread.interrupt();
        Runner tow = new Runner();
        countThread = new Thread(tow, "CountThread");
        countThread.start();
        // 睡眠1秒，main线程用cancel方法进行结束
        TimeUnit.SECONDS.sleep(1);
        tow.cancel();

    }

    private static class Runner implements Runnable {
        private long i;
        private volatile boolean on = true;

        @Override
        public void run() {
            while (on && !Thread.currentThread().isInterrupted()) {
                i++;
            }
            System.out.println("Count i = " + i);
        }

        public void cancel() {
            on = false;
        }
    }
}

Count i = 479216388
Count i = 483966781