Play with concurrency: what's the use of interruptedexception?

InterruptedException How do exceptions come about ？

interrupt Used to interrupt the execution of threads

When the thread is in WAITING and TIMED_WAITING In the state of , If the interrupt Method will throw InterruptedException

When the thread is running , If the interrupt Method just marks a stop in the current thread , The logic of stop needs to be realized by ourselves

Thread Class provides the following 2 There are two methods to determine whether the thread is in interrupt state

1. isInterrupted
2. interrupted

this 2 All of them can judge the state , But there are subtle differences

 @Test
 public void testInterrupt() throws InterruptedException {
    
     Thread thread = new Thread(() -> {
    
         while (true) {
    }
     });
     thread.start();
     TimeUnit.MICROSECONDS.sleep(100);
     thread.interrupt();
     // true
     System.out.println(thread.isInterrupted());
     // true
     System.out.println(thread.isInterrupted());
     // true
     System.out.println(thread.isInterrupted());
 }

 @Test
 public void testInterrupt2() {
    
     Thread.currentThread().interrupt();
     // true
     System.out.println(Thread.interrupted());
     // false
     System.out.println(Thread.interrupted());
     // false
     System.out.println(Thread.interrupted());
 }

isInterrupted and interrupted The differences are as follows

Thread#isInterrupted： Test whether the thread is in interrupt state , Do not change the status flag after execution
Thread#interrupted： Test whether the thread is in interrupt state , After execution, change the interrupt flag to false

Reference blog

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