java中线程中断interrupt
2019-01-28 本文已影响0人
ppyy_power
java中涉及线程中断主要有3个方法
1.interrupt(),在一个线程中调用另一个线程的interrupt()方法,即会向那个线程发出信号——线程中断状态已被设置。至于那个线程何去何从,由具体的代码实现决定。
2.isInterrupted(),用来判断当前线程的中断状态(true or false),不会清除线程的中断状态。
3.interrupted()是个Thread的static方法,也会判断线程的中断状态,但是会清除线程的中断状态。
/**
* Tests whether the current thread has been interrupted. The
* <i>interrupted status</i> of the thread is cleared by this method. In
* other words, if this method were to be called twice in succession, the
* second call would return false (unless the current thread were
* interrupted again, after the first call had cleared its interrupted
* status and before the second call had examined it).
*
* <p>A thread interruption ignored because a thread was not alive
* at the time of the interrupt will be reflected by this method
* returning false.
*
* @return <code>true</code> if the current thread has been interrupted;
* <code>false</code> otherwise.
* @see #isInterrupted()
* @revised 6.0
*/
public static boolean interrupted() {
return currentThread().isInterrupted(true);
}
interrupt只是改变线程的中断状态,状态改变以后的具体逻辑还需要由代码来实现,另外的重要作用就是将等待中的线程解救出来,抛出InterruptedException,任何抛出InterruptedException异常的方法都可以使用interrupt()方法。
public class InterruptionInJava implements Runnable{
private volatile static boolean on = false;
public static void main(String[] args) throws InterruptedException {
Thread testThread = new Thread(new InterruptionInJava(),"InterruptionInJava");
//start thread
testThread.start();
Thread.sleep(1000);
InterruptionInJava.on = true;
testThread.interrupt();
System.out.println("main end");
}
@Override
public void run() {
while(!on){
try {
Thread.sleep(10000000);
} catch (InterruptedException e) {
System.out.println("caught exception right now: "+e);
}
}
}
}