1、interrupt()方法
其作用是中断此线程(此线程不一定是当前线程,而是指调用该方法的Thread实例所代表的线程),但实际上只是给线程设置一个中断标志,线程仍会继续运行
2、interrupted()方法
作用是测试当前线程是否被中断(检查中断标志),返回一个boolean并清除中断状态,第二次再调用时中断状态已经被清除,将返回一个false。
3、isInterrupted()方法
作用是只测试此线程是否被中断 ,不清除中断状态。
代码测试:interrupt和LockSupport.park(this)混用的情况
public class ParkAndCheckInterrupt { private final boolean parkAndCheckInterrupt() { System.out.println("被阻塞之前的状态" + Thread.currentThread().getState()); LockSupport.park(this); System.out.println("被阻塞之后的状态" + Thread.currentThread().getState()); System.out.println("Thread.interrupted()之前的状态" + Thread.currentThread().getState()); boolean interrupted = Thread.interrupted(); System.out.println("Thread.interrupted()之后的状态" + Thread.currentThread().getState()); return interrupted; } public static void main(String[] args) throws InterruptedException { ParkAndCheckInterrupt SPCK = new ParkAndCheckInterrupt(); Thread thread = new Thread(new Runnable() { @Override public void run() { System.out.println("Before Park!"); if (SPCK.parkAndCheckInterrupt()) { System.out.println("中断返回!"); } else { System.out.println("Unpark返回!"); } } }); thread.start(); TimeUnit.SECONDS.sleep(1); System.out.println("第一次调用thread.isInterrupted():" + thread.isInterrupted()); System.out.println("thread.interrupt()之前的状态" + thread.getState()); thread.interrupt(); System.out.println("thread.interrupt()之后的状态" + thread.getState()); System.out.println("第二次调用thread.isInterrupted():" + thread.isInterrupted()); System.out.println("thread是否存活:" + thread.isAlive()); } }
总结:执行线程的interrupt();方法会设置中断标志位,LockSupport.park()会检查线程是否设置了中断标志位,如果设置了,则返回(这里并不会清除中断标志位)
interrupt方法的总结:
1.interrupt 方法打断 sleep,wait,join 的线程。打断阻塞的线程,会抛出InterruptedException异常, 会清空打断状态,即isInterrupted()=false
2.打断正常运行的线程, 不会清空打断状态,即isInterrupted()=true
3.打断 park 线程, 不会清空打断状态,打断状态为true时,会让park失效,也不会抛出异常
参考:https://blog.csdn.net/qq_39682377/article/details/81449451
参考:https://www.cnblogs.com/septemberFrost/p/12200755.html