12.观测线程状态

线程状态观测

Thread.State

线程状态。线程可以处于以下状态之一：

new:尚未启动的线程处于此状态

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：正在等待另一个线程执行特定动作的线程处于此状态

timed_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：已退出的线程处于此状态

一个线程可以在给定时间点处于一个状态。这些状态是不反映任何操作系统线程状态的虚拟机状态

package com.lei;
​
//观测测试线程的状态
public class TestState {
   public static void main(String[] args) {
       Thread thread = new Thread(()->{
           for (int i =0;i<5;i++){
               try {
                   Thread.sleep(1000);
               } catch (InterruptedException e) {
                   e.printStackTrace();
               }
           }
           System.out.println("///////");
       });
​
       //观测状态
       Thread.State state = thread.getState();
       System.out.println(state); //New
​
       //观察启动后
       thread.start();//启动线程
       state = thread.getState();
       System.out.println(state); //run
​
       while(state != Thread.State.TERMINATED){ //只要线程不终止，就一直输出状态
           try {
               Thread.sleep(100);
               state = thread.getState(); //更新线程状态
               System.out.println(state); //输出状态
           } catch (InterruptedException e) {
               e.printStackTrace();
           }
​
       }
​
​
   }
​
}
​
​
NEW
RUNNABLE
TIMED_WAITING
TIMED_WAITING
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///////
TERMINATED