测试Thread.isAlive

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);
        }
    }
}

结果：

true
true
true
true
true
true
true
true
true
true
线程停止
false
false
false
false
false
false

能正确识别线程是否在运行