线程isAlive方法

怼烎@ 2021-12-05 15:17 182阅读 0赞

**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。

![复制代码][copycode.gif]

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());
        }
    }

![复制代码][copycode.gif]

运行结果：

![1185653-20171013221742465-860671112.png][]

[copycode.gif]: /images/20211205/ba8907209e514e84ab679fa6c329a986.png
[1185653-20171013221742465-860671112.png]: /images/20211205/cc06457c572742f190bdbe65caa66637.png