public class TestThread extends Thread {    @Override    public void run() {        super.run();        try {            sleep(10000);            System.out.println("线程停止");        } catch (InterruptedException e) {            e.printStackTrace();        }    }}

public class MainThread {    public static void main(String[] args) throws InterruptedException {        TestThread t = new TestThread();        t.start();        while (true) {            System.out.println(t.isAlive());            Thread.sleep(1000);        }    }}