Java守护线程daemon介绍
1.介绍
- 线程分为用户线程和守护线程
- JVM必须确保用户线程执行完毕,但是不用等待守护线程执行完毕
示例代码:
public class TestDaemon {
public static void main(String[] args) {
DaemonThread daemon = new DaemonThread();
CustomerThread customer = new CustomerThread();
Thread thread1 = new Thread(daemon);
thread1.setDaemon(true); // 默认是false是用户线程
Thread thread2 = new Thread(customer);
// 执行
thread1.start();
thread2.start();
}
}
class DaemonThread implements Runnable {
@Override
public void run() {
while (true) {
System.out.println("God bless you!");
}
}
}
class CustomerThread implements Runnable {
@Override
public void run() {
for (int i = 0; i < 1000; i++) {
System.out.println("process:" + i);
}
System.out.println("customer thread end.");
}
}
执行结果:
用户线程执行完毕后,JVM则停止,不管守护线程(JVM停止需要一些时间,在此期间守护线程继续执行)