interrupt（）理解

之前对interrupt（）方法一直不太理解，可能是这个名字太具有迷惑性了吧。
interrupt不能中断正在运行的线程，如下代码

class Example1 extends Thread {
boolean stop = false;
public static void main(String args[]) throws Exception {
Example1 thread = new Example1();
System.out.println("Starting thread...");
thread.start();
Thread.sleep(3000);
System.out.println("Interrupting thread...");
thread.interrupt();
System.out.println("thread interrupt()" + thread.isInterrupted());
Thread.sleep(3000);
System.out.println("Stopping application...");
// System.exit(0);
}
public void run() {
while (!stop) {
System.out.println("Thread is running...");
long time = System.currentTimeMillis();
while ((System.currentTimeMillis() - time < 1000)) {
}
}
System.out.println("Thread exiting under request...");
}
}

但是上面的代码还是有漏洞的，Example1对thread执行了interrupt操作，没有中断thread是因为interrupt方法只是在目标线程中设置了一个标志，表示它已经被中断。Example1对thread设置了中断标志但并没有检查这个标志是否被设置，所以Example1无法中断thread。对上面代码修改如下

class Example1 extends Thread {
boolean stop = false;
public static void main(String args[]) throws Exception {
Example1 thread = new Example1();
System.out.println("Starting thread...");
thread.start();
Thread.sleep(3000);
System.out.println("Interrupting thread...");
thread.interrupt();
System.out.println("thread interrupt()" + thread.isInterrupted());
Thread.sleep(3000);
System.out.println("Stopping application...");
// System.exit(0);
}
public void run() {
//检查中断标志
while (!stop && !Thread.currentThread().isInterrupted()) {
System.out.println("Thread is running...");
long time = System.currentTimeMillis();
while ((System.currentTimeMillis() - time < 1000)) {
}
}
System.out.println("Thread exiting under request...");
}
}