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//该方法除了能够返回当前线程的中断状态，还能根据ClearInterrupted参数来决定要不要重置中断标志位
private native boolean isInterrupted(boolean ClearInterrupted);

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public boolean isInterrupted() {
    return isInterrupted(false);
}

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public static boolean interrupted() {
    return currentThread().isInterrupted(true);
}

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/**
 * Thrown when a thread is waiting, sleeping, or otherwise occupied,
 * and the thread is interrupted, either before or during the activity.
 * Occasionally a method may wish to test whether the current
 * thread has been interrupted, and if so, to immediately throw
 * this exception.  The following code can be used to achieve
 * this effect:
 * <pre>
 *  if (Thread.interrupted())  // Clears interrupted status!
 *      throw new InterruptedException();
 * </pre>
 *
 * @author  Frank Yellin
 * @see     java.lang.Object#wait()
 * @see     java.lang.Object#wait(long)
 * @see     java.lang.Object#wait(long, int)
 * @see     java.lang.Thread#sleep(long)
 * @see     java.lang.Thread#interrupt()
 * @see     java.lang.Thread#interrupted()
 * @since   JDK1.0
 */
public class InterruptedException extends Exception {}

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/**
 * Causes the currently executing thread to sleep (temporarily cease
 * execution) for the specified number of milliseconds, subject to
 * the precision and accuracy of system timers and schedulers. The thread
 * does not lose ownership of any monitors.
 *
 * @param  millis
 *         the length of time to sleep in milliseconds
 *
 * @throws  IllegalArgumentException
 *          if the value of {@code millis} is negative
 *
 * @throws  InterruptedException
 *          if any thread has interrupted the current thread. The
 *          <i>interrupted status</i> of the current thread is
 *          cleared when this exception is thrown.
 */
public static native void sleep(long millis) throws InterruptedException;

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/**
 * Interrupts this thread.
 *
 * <p> Unless the current thread is interrupting itself, which is
 * always permitted, the {@link #checkAccess() checkAccess} method
 * of this thread is invoked, which may cause a {@link
 * SecurityException} to be thrown.
 *
 * <p> If this thread is blocked in an invocation of the {@link
 * Object#wait() wait()}, {@link Object#wait(long) wait(long)}, or {@link
 * Object#wait(long, int) wait(long, int)} methods of the {@link Object}
 * class, or of the {@link #join()}, {@link #join(long)}, {@link
 * #join(long, int)}, {@link #sleep(long)}, or {@link #sleep(long, int)},
 * methods of this class, then its interrupt status will be cleared and it
 * will receive an {@link InterruptedException}.
 *
 * <p> If this thread is blocked in an I/O operation upon an {@link
 * java.nio.channels.InterruptibleChannel InterruptibleChannel}
 * then the channel will be closed, the thread's interrupt
 * status will be set, and the thread will receive a {@link
 * java.nio.channels.ClosedByInterruptException}.
 *
 * <p> If this thread is blocked in a {@link java.nio.channels.Selector}
 * then the thread's interrupt status will be set and it will return
 * immediately from the selection operation, possibly with a non-zero
 * value, just as if the selector's {@link
 * java.nio.channels.Selector#wakeup wakeup} method were invoked.
 *
 * <p> If none of the previous conditions hold then this thread's interrupt
 * status will be set. </p>
 *
 * <p> Interrupting a thread that is not alive need not have any effect.
 *
 * @throws  SecurityException
 *          if the current thread cannot modify this thread
 *
 * @revised 6.0
 * @spec JSR-51
 */
public void interrupt() {
    if (this != Thread.currentThread())
        checkAccess();

    synchronized (blockerLock) {
        Interruptible b = blocker;
        if (b != null) {
            //设置中断标志
            interrupt0();           // Just to set the interrupt flag
            b.interrupt(this);
            return;
        }
    }
    interrupt0();
}