Thread中的interrupt(),interrupted(),isInterrupted()方法的详解

1.interrupt()

　　使用来中断线程作用的。除非当前线程处于中断状态，这个方法总是可以被执行的。如果当前线程被

Object#wait() wait(long)

或者

Thread#join() join(long),sleep()

方法所阻塞时，然而中断状态将被清空变成

false

,如果被IO/NIO阻塞，使用该方法，中断状态将被设置成

true

,未中断状态为

false

，中断状态为

true

public class InterruptTest
{
public static void main(String[] args)
{
System.out.println(Thread.currentThread().getName()+" interrupt before "+Thread.currentThread().isInterrupted());
Thread.currentThread().interrupt();
System.out.println(Thread.currentThread().getName()+" interrupt after "+Thread.currentThread().isInterrupted());
}
}
结果：
main interrupt before false
main interrupt after true
class TestThread extends Thread
{
public TestThread(String name){
setName(name);
}
public void run()
{
try{
Thread.sleep(10);
}catch(Exception e){
e.printStackTrace();
}
}
}
public class InterruptTest
{
public static void main(String[] args) throws InterruptedException
{
TestThread tt = new TestThread("test");
tt.start();
System.out.println(tt.getName()+" interrupt before "+tt.isInterrupted());
tt.interrupt();//中断sleep将会清空中断状态
Thread.sleep(1000);//等待test线程
System.out.println(tt.getName()+" interrupt after "+tt.isInterrupted());

}
}

结果

test interrupt before false
java.lang.InterruptedException: sleep interrupted
at java.lang.Thread.sleep(Native Method)
at thread2.TestThread.run(InterruptTest.java:11)
test interrupt after false

2.interrupted

　　测试当前线程是否中断，这个方法将会清除中断状态，换句话说，如果这个方法被成功调用2次，第二次将会返回false，除非当前线程再次被中断，可以在第一个调用后，第二次调用前去检测它。

public class InterruptTest
{
public static void main(String[] args) throws InterruptedException
{
System.out.println(Thread.currentThread().getName()+" interrupt before "+Thread.currentThread().interrupted());
Thread.currentThread().interrupt();
System.out.println(Thread.currentThread().getName()+" interrupt after once "+Thread.currentThread().interrupted());//调用之后清除中断状态
System.out.println(Thread.currentThread().getName()+" interrupt after twice "+Thread.currentThread().interrupted());
}
}

结果

main interrupt before false
main interrupt after once true
main interrupt after twice false

3.isInterrupted()

返回线程中断状态，调用isInterrupted()方法不会影响中断状态。

public class InterruptTest
{
public static void main(String[] args) throws InterruptedException
{
System.out.println(Thread.currentThread().getName()+" interrupt before "+Thread.currentThread().isInterrupted());
Thread.currentThread().interrupt();
System.out.println(Thread.currentThread().getName()+" interrupt after once "+Thread.currentThread().isInterrupted());
System.out.println(Thread.currentThread().getName()+" interrupt after twice "+Thread.currentThread().isInterrupted());
System.out.println(Thread.currentThread().getName()+" interrupt after three "+Thread.currentThread().isInterrupted());
}
}

结果

main interrupt before false
main interrupt after once true
main interrupt after twice true
main interrupt after three true