04.join与interrupt
2024-10-07 16:03:29
join加入
public class JoinDemo {
public volatile static int i = 0;
public static class AddThread extends Thread{
@Override
public void run() {
for (i=0;i<10000000;i++);
}
}
public static void main(String[] args) throws InterruptedException{
AddThread addThread = new AddThread();
addThread.start();
addThread.join();
System.out.println(i);
}
}
public class JoinDemo {
public static void main(String[] args) throws InterruptedException{
Thread threadA = new Thread(new Runnable() {
@Override
public void run() {
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println("child threadA over");
}
});
Thread threadB = new Thread(new Runnable() {
@Override
public void run() {
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println("child threadB over");
}
});
threadA.start();
threadB.start();
System.out.println("wait all thread over");
//等待子线程执行完毕
threadA.join();//主线程调用threadA的join()方法后被阻塞，等待threadA执行完毕
threadB.join();
System.out.println("all thread over");
//wait all thread over
//child threadA over
//child threadB over
//all thread over
Thread threadOne = new Thread(new Runnable() {
@Override
public void run() {
System.out.println("threadOne begin run");
while (true){} //死循环
}
});
//获取主线程
final Thread mainThread = Thread.currentThread();
Thread threadTwo = new Thread(new Runnable() {
@Override
public void run() {
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
//中断主线程
mainThread.interrupt();
System.out.println("threadTwo begin run");
}
});
threadOne.start();
threadTwo.start();
threadOne.join();
//threadOne begin run
//threadTwo begin run
//Exception in thread "main" java.lang.InterruptedException
//在 threadOne 线程里面执行死循环，主线程调用 threadOne 的 join 方 法阻 塞 自己 等 待线程 threadOne 执行完毕，
// 待 threadTwo 休眠 ls 后会调用主线程的 interrupt（） 方法设置主线程的中断标志，
// 从结果看在主线程中的 threadOne.join（） 处会抛 出 InterruptedException 异常
}
}
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