为什么在我调用Thread.currentThread（）之后thread.isInterrupted（）返回false中断（）

Question

当我运行这个测试时，为什么sleepThread.isInterrupted()总是返回false？

（我不得不执行Thread.currentThread().interrupt()设置中断标志时，赶上InterruptedException）。

@Test 
public void t() { 
    Thread sleepThread = new Thread() { 
     @Override 
     public void run() { 
      try { 
       Thread.sleep(5 * 1000); 
      } catch (InterruptedException e) { 
       System.out.println("have been interruptted...."); 
       e.printStackTrace(); 

       Thread.currentThread().interrupt(); 

       // in here this.isInterrupted() will return true 
       System.out.println("now , instant interrupt flag : " 
       + this.isInterrupted()); 
      } 
     } 
    }; 
    sleepThread.start(); 

    try { 
     sleepThread.interrupt(); 
     Thread.sleep(2 * 1000); 

     // in here ,why sleepThread.isInterrupted() return false ? 
     System.out.println("sleep thread interrupt flag : " 
     + sleepThread.isInterrupted()); 
    } catch (InterruptedException e) { 
     e.printStackTrace(); 
    } 
} 

这是输出：因为达到

System.out.println("sleep thread interrupt flag : " + sleepThread.isInterrupted()); 

线程的最后一条语句会死的时候

have been interruptted 
now , instant interrupt flag : true 
java.lang.InterruptedException: sleep interrupted 
    at java.lang.Thread.sleep(Native Method) 
    at com.roundwith.concurrent.Interrupt_Test$1.run(Interrupt_Test.java:15) 
sleep thread interrupt flag : false 

Answer 1

它。

尝试去除主线程中2秒钟的睡眠并且您会看到不同（尝试几次运行 - 它可能仍会打印错误，但至少主线程有机会看到其他线程还活着）。

Answer 2

尝试改变，

Thread.sleep(2 * 1000); 

到

//Thread.sleep(2 * 1000);