JUC学习-11-优雅的线程中断

JUC学习-11-线程中断

在执行完interrupt()方法后，只是给线程做了一个“打断的标记”，通知线程需要中断，并不会立即中断线程。

class TestIsInterrupted {
public static void main(String[] args) {
Thread t1 = new Thread() {
@Override
public void run() {
while (true) {
System.out.println("检测中");
}
}
};
t1.start();
t1.interrupt();
}
}

二、检查线程中断标志

检查中断标志位，判断当前线程是否被中断。

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

---

静态方法。判断线程是否被中断，并清除当前中断状态

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

优雅的中断线程

class TestIsInterrupted {
public static void main(String[] args) {
Thread t1 = new Thread() {
@Override
public void run() {
while (true) {
// 查看中断标记
System.out.println(Thread.currentThread().isInterrupted());
// 判断中断标识 并清除当前中断状态
if (Thread.interrupted()) {
System.out.println(Thread.currentThread().isInterrupted());
break;
}
System.out.println("检测中");
}
}
};
t1.start();
t1.interrupt();
}
}

结果如下：

三、当出现InterruptedException 异常时，会清除中断标记 （变为false）

class TestIsInterrupted {
public static void main(String[] args) {
Thread t1 = new Thread() {
@Override
public void run() {
while (true) {
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
// 当出现InterruptedException 会清除中断标记 false
e.printStackTrace();
}
// 查看中断标记
System.out.println(Thread.currentThread().isInterrupted());
if (Thread.interrupted()) {
System.out.println(Thread.currentThread().isInterrupted());
break;
}
System.out.println("检测中");
}
}
};
t1.start();
t1.interrupt();
}
}

结果如下：

抛出异常后 再次加上中断标志（true）

class TestIsInterrupted {
public static void main(String[] args) {
Thread t1 = new Thread() {
@Override
public void run() {
while (true) {
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
// 当出现InterruptedException 会清除中断标记 false
e.printStackTrace();
// 再次加上中断标记
Thread.currentThread().interrupt();
}
// 查看中断标记
System.out.println(Thread.currentThread().isInterrupted());
if (Thread.interrupted()) {
System.out.println(Thread.currentThread().isInterrupted());
break;
}
System.out.println("检测中");
}
}
};
t1.start();
t1.interrupt();
}
}

结果如下：