什么是中断?

中断是一个指示 线程应该停止它是什么 做和做别的事情。由 由程序员来决定 线程如何响应中断， 但这对于线程来说是很常见的 终止。

它是如何实现的?

实现了中断机制 使用内部标志 中断状态。调用 interrupt设置这个标志。当 线程通过检查中断 调用静态方法 中断状态 清除。非静态的 线程。被使用的isInterrupted 一个线程来查询中断 另一种状态，并不会改变 中断状态标志。

引用自Thread.interrupt() API:

Interrupts this thread. First the checkAccess method of this thread is invoked, which may cause a SecurityException to be thrown. If this thread is blocked in an invocation of the wait(), wait(long), or wait(long, int) methods of the Object class, or of the join(), join(long), join(long, int), sleep(long), or sleep(long, int), methods of this class, then its interrupt status will be cleared and it will receive an InterruptedException. If this thread is blocked in an I/O operation upon an interruptible channel then the channel will be closed, the thread's interrupt status will be set, and the thread will receive a ClosedByInterruptException. If this thread is blocked in a 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 wakeup method were invoked. If none of the previous conditions hold then this thread's interrupt status will be set.

看看下面的内容，你就能完全理解:

http://download.oracle.com/javase/tutorial/essential/concurrency/interrupt.html

为了完整起见，除了其他答案外，如果线程在阻塞Object.wait(..)或thread .sleep(..)等之前被中断，这相当于在阻塞该方法时立即被中断，如下例所示。

public class InterruptTest {
    public static void main(String[] args) {

        Thread.currentThread().interrupt();

        printInterrupted(1);

        Object o = new Object();
        try {
            synchronized (o) {
                printInterrupted(2);
                System.out.printf("A Time %d\n", System.currentTimeMillis());
                o.wait(100);
                System.out.printf("B Time %d\n", System.currentTimeMillis());
            }
        } catch (InterruptedException ie) {
            System.out.printf("WAS interrupted\n");
        }
        System.out.printf("C Time %d\n", System.currentTimeMillis());

        printInterrupted(3);

        Thread.currentThread().interrupt();

        printInterrupted(4);

        try {
            System.out.printf("D Time %d\n", System.currentTimeMillis());
            Thread.sleep(100);
            System.out.printf("E Time %d\n", System.currentTimeMillis());
        } catch (InterruptedException ie) {
            System.out.printf("WAS interrupted\n");
        }
        System.out.printf("F Time %d\n", System.currentTimeMillis());

        printInterrupted(5);

        try {
            System.out.printf("G Time %d\n", System.currentTimeMillis());
            Thread.sleep(100);
            System.out.printf("H Time %d\n", System.currentTimeMillis());
        } catch (InterruptedException ie) {
            System.out.printf("WAS interrupted\n");
        }
        System.out.printf("I Time %d\n", System.currentTimeMillis());

    }
    static void printInterrupted(int n) {
        System.out.printf("(%d) Am I interrupted? %s\n", n,
                Thread.currentThread().isInterrupted() ? "Yes" : "No");
    }
}

输出:

$ javac InterruptTest.java 

$ java -classpath "." InterruptTest
(1) Am I interrupted? Yes
(2) Am I interrupted? Yes
A Time 1399207408543
WAS interrupted
C Time 1399207408543
(3) Am I interrupted? No
(4) Am I interrupted? Yes
D Time 1399207408544
WAS interrupted
F Time 1399207408544
(5) Am I interrupted? No
G Time 1399207408545
H Time 1399207408668
I Time 1399207408669

含义:如果你像下面这样循环，并且中断发生在控制已经离开Thread.sleep(..)并且正在循环的确切时刻，异常仍然会发生。因此，依赖InterruptedException在线程被中断后可靠地抛出是完全安全的:

while (true) {
    try {
        Thread.sleep(10);
    } catch (InterruptedException ie) {
        break;
    }
}

什么是中断?

中断是一个指示 线程应该停止它是什么 做和做别的事情。由 由程序员来决定 线程如何响应中断， 但这对于线程来说是很常见的 终止。

它是如何实现的?

实现了中断机制 使用内部标志 中断状态。调用 interrupt设置这个标志。当 线程通过检查中断 调用静态方法 中断状态 清除。非静态的 线程。被使用的isInterrupted 一个线程来查询中断 另一种状态，并不会改变 中断状态标志。

引用自Thread.interrupt() API:

Interrupts this thread. First the checkAccess method of this thread is invoked, which may cause a SecurityException to be thrown. If this thread is blocked in an invocation of the wait(), wait(long), or wait(long, int) methods of the Object class, or of the join(), join(long), join(long, int), sleep(long), or sleep(long, int), methods of this class, then its interrupt status will be cleared and it will receive an InterruptedException. If this thread is blocked in an I/O operation upon an interruptible channel then the channel will be closed, the thread's interrupt status will be set, and the thread will receive a ClosedByInterruptException. If this thread is blocked in a 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 wakeup method were invoked. If none of the previous conditions hold then this thread's interrupt status will be set.

看看下面的内容，你就能完全理解:

http://download.oracle.com/javase/tutorial/essential/concurrency/interrupt.html

公共无效中断()

中断这个线程。

除非当前线程正在中断自身(这总是允许的)，否则调用该线程的checkAccess方法，这可能导致抛出SecurityException。

如果这个线程在Object类的wait()、wait(long)或wait(long, int)方法的调用中被阻塞，或者该类的join()、join(long)、join(long, int)、sleep(long)或sleep(long, int)方法的调用中被阻塞，那么它的中断状态将被清除，它将接收一个InterruptedException。

如果这个线程在一个可中断通道上的I/O操作中被阻塞，那么通道将被关闭，线程的中断状态将被设置，并且线程将收到一个ClosedByInterruptException。

如果这个线程在选择器中被阻塞，那么线程的中断状态将被设置，并且它将立即从选择操作中返回，可能是一个非零值，就像调用选择器的唤醒方法一样。

如果以上条件都不满足，则该线程的中断状态将被设置。

中断一个不活跃的线程不会有任何影响。

抛出: 如果当前线程不能修改该线程，则返回SecurityException

如果目标线程一直在等待(通过调用wait()，或其他一些本质上做同样事情的相关方法，如sleep())，它将被中断，这意味着它将停止等待它正在等待的东西，而是接收一个InterruptedException。

完全由线程本身(调用wait()的代码)决定在这种情况下做什么。它不会自动终止线程。

它有时与终止标志结合使用。当被中断时，线程可以检查这个标志，然后关闭自己。但这只是惯例。

Thread.interrupt()方法设置内部的“中断状态”标志。通常该标志由Thread.interrupted()方法检查。

按照惯例，任何通过InterruptedException存在的方法都必须清除中断状态标志。