观察线程状态

Posted 2021-05-17 做个机灵鬼

线程状态：Thread.State

new: new Thread() 后处于新生状态,尚未启动

Runnable: 在Java虚拟机中执行的线程处于此状态

Blocked: 被阻塞,等待监视器锁定的线程处于此状态

Waiting: 等待另一个线程执行特定动作的线程处于此状态

Time_Waiting: 正在等待另一个线程执行动作达到指定等待时间的线程处于此状态;

Terminated: 退出的线程处于此状态.

//观察线程状态
public class TextState {
    public static void main(String[] args) throws InterruptedException {
        Thread thread = new Thread(() -> {
            for (int i = 0; i < 5; i++) {
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
            System.out.println("/");
        });

        //观察状态
        Thread.State state = thread.getState();
        System.out.println(state);//NEW

        //观察启动线程后的状态
        thread.start();
        state = thread.getState();//更新线程状态
        System.out.println(state);//Run
       //观察线程运行起来到结束之前的状态
        while (state!=Thread.State.TERMINATED){//只要线程不停止 就一直输出线程的状态
            Thread.sleep(100);
            state = thread.getState();//更新线程状态
            System.out.println(state);//获得线程状态
}
        //观察线程结束后的状态
        thread.start();//报错，线程结束后不能再启动

    }

}