我所理解的是：子线程在执行sleep()后会进入timed_waiting状态，子线程在timed_waiting状态下被中断后，子线程会抛出异常sleep interrupted，子线程会由timed_waiting变成terminated状态。
但是为什么实际的结果中，子线程的状态是Runnable状态 ，而不是timed_waiting ？

public class InterruptDemo {
    public static void main(String[] args) throws InterruptedException {
        Runnable interruptTask = new Runnable() {
            @Override
            public void run() {
                int i = 0;
                try {
                    while (!Thread.currentThread().isInterrupted()) {
                        Thread.sleep(200);  // Timed_waiting状态
                        i++;
                        System.out.println(Thread.currentThread().getName() + " (" +
                                Thread.currentThread().getState() + ") loop " + i);
                    }
                } catch (InterruptedException e) {
                    System.out.println(Thread.currentThread().getName() + " (" +
                            Thread.currentThread().getState() + ") catch InterruptedException.");
                }
            }
        };
        Thread t1 = new Thread(interruptTask, "t1");
        System.out.println(t1.getName() +" ("+t1.getState()+") is new.");
        t1.start();
        System.out.println(t1.getName() +" ("+t1.getState()+") is started.");
        Thread.sleep(300);
        t1.interrupt();  // 中断子线程
        System.out.println(t1.getName() +" ("+t1.getState()+") is interrupted.");
        Thread.sleep(300);
        System.out.println(t1.getName() +" ("+t1.getState()+") is interrupted now.");
    }
}

程序执行结果：