每个线程都有一个boolean类型的标志来表明线程是否发生了中断，并且包含了中断相关的函数：interrupt()用于设置线程的中断状态为true，isInterrupted()用于返回线程的中断状态，interrupted()方法用于清除中断状态，并返回之前的中断状态。
当线程在调用sleep()或者wait()时，对中断的表现为抛出InterruptedException异常并清除中断状态，所以可以使用try-catch并在catch中写阻塞时被中断的处理方法:
/**
*
* @author jianbinggouzi
*/
public class MainClass{
public static void main(String args[]){
Object obj = new Object();
Thread t2= new Thread(){
public void run(){
try{
synchronized(obj){
System.out.println("hello");
//obj.notify();
}
}
}catch(Exception e){
e.printStackTrace();
}
}
};
Thread t1 = new Thread(){
public void run(){
synchronized(obj){
try {
System.out.println("t1");
obj.wait();
System.out.println("finish");
}
catch(InterruptedException e){
System.out.println("interrupted");
return;
}
catch (Exception ex) {
Logger.getLogger(MainClass.class.getName()).log(Level.SEVERE, null, ex);
}
}
}
};
t1.start();
t2.start();
new Thread(){
int n=0;
public void run(){
while(true){
try{
Thread.sleep(1000);
if(n++>1){
t1.interrupt();
}
System.out.println(t1.getState()+" "+t2.getState());
}catch(Exception e){
e.printStackTrace();
}
}
}
}.start(
}
}
结果：
当线程没有处在阻塞状态时如果发生中断，线程将会保持运行下去直到运行到有对中断状态检查的地方（也就是说，由线程自己控制什么时候响应中断）：
/**
*
* @author jianbinggouzi
*/
public class MainClass {
public static void main(String args[]){
Thread thread = new Thread(){
public void run(){
while(!Thread.currentThread().isInterrupted()){
System.out.println("running");
}
System.out.println("finish");
}
};
thread.start();
new Thread(){
int n=0;
public void run(){
while(true){
try{
Thread.sleep(1000);
if(n++>1){
thread.interrupt();
}
}catch(Exception e){
e.printStackTrace();
}
}
}
}.start();
}
}
结果：
在线程池中，可以用submit(Runnable r)方法返回的Future实例来管理线程池中的线程，Future的cancel方法参数为true时，表示设置一个正在运行的线程的中断标记，为false时表示不设置线程的中断标记，适用于“如果线程还没启动，就取消这个线程，否则就不取消”：
当cancel(true)时：
/**
*
* @author jianbinggouzi
*/
public class ExecutorServiceTest {
private ExecutorService service = Executors.newFixedThreadPool(10);
private ThreadPoolExecutor threadPoolExecutor = (ThreadPoolExecutor) Executors.newFixedThreadPool(5);
Future futures[] = new Future[2];
public ExecutorServiceTest(){
Runnable t = new Runnable(){
public void run(){
try{
System.out.println(Thread.currentThread().getId()+"start");
Thread.sleep(1000);
System.out.println(""+Thread.currentThread().getId()+"finish1");
}catch(InterruptedException ex){
System.out.println(""+Thread.currentThread().getId()+"interrupted");
}
}
};
for(int i=0;i<2;i++){
futures[i] = threadPoolExecutor.submit(t);
}
try{
Thread.sleep(200);
System.out.println(futures[0].cancel(true)+" "+futures[1].cancel(true));
}catch(Exception e){
}
}
}
输出：
cancel(false)时：
/**
*
* @author jianbinggouzi
*/
public class ExecutorServiceTest {
private ExecutorService service = Executors.newFixedThreadPool(10);
private ThreadPoolExecutor threadPoolExecutor = (ThreadPoolExecutor) Executors.newFixedThreadPool(5);
Future futures[] = new Future[2];
public ExecutorServiceTest(){
Runnable t = new Runnable(){
public void run(){
try{
System.out.println(Thread.currentThread().getId()+"start");
Thread.sleep(1000);
System.out.println(""+Thread.currentThread().getId()+"finish1");
}catch(InterruptedException ex){
System.out.println(""+Thread.currentThread().getId()+"interrupted");
}
}
};
for(int i=0;i<2;i++){
futures[i] = threadPoolExecutor.submit(t);
}
try{
Thread.sleep(200);
System.out.println(futures[0].cancel(false)+" "+futures[1].cancel(false));
}catch(Exception e){
}
}
}
输出：