Java 学习笔记之 线程isAlive方法

isAlive方法：

方法isAlive()功能是判断当前线程是否处于活动状态。

活动状态就是线程启动且尚未终止，比如正在运行或准备开始运行。

public class IsAliveThread extends Thread {

    public IsAliveThread() {

        System.out.println("begin");

        System.out.println("Thread.currentThread().getName() : " + Thread.currentThread().getName());

        System.out.println("Thread.currentThread().isAlive() : " + Thread.currentThread().isAlive());

        System.out.println("this.getName() : " +  this.getName());

        System.out.println("this.isAlive() : " + this.isAlive());

        System.out.println("end");

    }

    @Override

    public void run() {

        System.out.println("run begin");

        System.out.println("Thread.currentThread().getName() : " + Thread.currentThread().getName());

        System.out.println("Thread.currentThread().isAlive() : " + Thread.currentThread().isAlive());

        System.out.println("this.getName() : " +  this.getName());

        System.out.println("this.isAlive() : " + this.isAlive());

        System.out.println("run end");

    }

}

public class ThreadRunMain {

    public static void main(String[] args) {

        testIsAliveThread();

    }

    public static void testIsAliveThread(){

        IsAliveThread ist = new IsAliveThread();

        Thread th = new Thread(ist);

        System.out.println("Main begin th isAlive = " + th.isAlive());

        th.start();

        System.out.println("Main end th isAlive = " + th.isAlive());

    }

}

运行结果：