12.觀測線程狀態

線程狀態觀測

Thread.State

線程狀態。線程可以處於以下狀態之一：

new:尚未啟動的線程處於此狀態

runnable:在java虛擬機中執行的線程處於此狀態

blocked:被阻塞等待監視器鎖定的線程處於此狀態

waiting：正在等待另一個線程執行特定動作的線程處於此狀態

timed_waiting:正在等待另一個線程執行動作達到指定等待時間的線程處於此狀態

terminated：已退出的線程處於此狀態

一個線程可以在給定時間點處於一個狀態。這些狀態是不反映任何操作系統線程狀態的虛擬機狀態

package com.lei;
​
//觀測測試線程的狀態
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("///////");
       });
​
       //觀測狀態
       Thread.State state = thread.getState();
       System.out.println(state); //New
​
       //觀察啟動后
       thread.start();//啟動線程
       state = thread.getState();
       System.out.println(state); //run
​
       while(state != Thread.State.TERMINATED){ //只要線程不終止，就一直輸出狀態
           try {
               Thread.sleep(100);
               state = thread.getState(); //更新線程狀態
               System.out.println(state); //輸出狀態
           } catch (InterruptedException e) {
               e.printStackTrace();
           }
​
       }
​
​
   }
​
}
​
​
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///////
TERMINATED