Java 中通知线程退出的理解

public class ThreadExit {
    public static void main(String[] args) {
        T t = new T();
        t.start();
        //如果希望main主线程，去控制t线程的终止，必须修改loop
        //让t 退出run方法 从而终止t线程 ->通知方式
        //让主线程休眠10秒，再通知t1线程退出
        System.out.println("main线程休眠10s...");
        try {
            Thread.sleep(10 * 1000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        t.setLoop(false);
    }
}
class T extends Thread {
    private int count = 0;
    //设置一个控制变量
    private boolean loop = true;
    @Override
    public void run() {
        while (loop) {
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            System.out.println("T 运行中" + (++count));
        }
    }
    public void setLoop(boolean loop) {
        this.loop = loop;
    }
}