把某个线程interrupt()后，竟然还继续执行！那这个方法究竟有啥用呢？

import java.io.IOException;
public class Test {

public static void main(String[] args) throws InterruptedException, IOException {
ThreadInterrupt t = new ThreadInterrupt();
Thread thread = new Thread(t);
thread.start();
Thread.sleep(5000);
//5秒后thread被打断
thread.interrupt();
System.out.println("线程退出运行！");
}

}

public class ThreadInterrupt implements Runnable{
public void run() {
for(int i=0;i<500;i++){
System.out.println("i am a running thread"+(i));
try {
Thread.sleep(2000);
} catch (InterruptedException e) {
System.out.println("睡眠被打断！");
}
}
}
}
interrupt()方法困惑？