Java中的用户线程与守护程序线程？
该 守护线程 通常用来为用户线程执行服务。应用程序线程的main()方法是用户线程（非守护线程）。在JVM不会终止，除非所有的用户线程（非守护）终止。我们可以通过调用setDaemon(true)将由 用户线程创建的线程明确指定为守护程序线程。通过使用方法isDaemon()确定线程是否是守护程序线程。
示例
public class UserDaemonThreadTest extends Thread {
public static void main(String args[]) {
System.out.println("Thread name is : "+ Thread.currentThread().getName()); // Check whether the main thread is daemon or user thread System.out.println("Is main thread daemon ? : "+ Thread.currentThread().isDaemon());
UserDaemonThreadTest t1 = new UserDaemonThreadTest();
UserDaemonThreadTest t2 = new UserDaemonThreadTest();
// Converting t1(user thread) to a daemon thread
t1.setDaemon(true);
t1.start();
t2.start();
}
public void run() {
//检查线程是否是守护进程
if (Thread.currentThread().isDaemon()) {
System.out.println(Thread.currentThread().getName()+" is a Daemon Thread");
} else {
System.out.println(Thread.currentThread().getName()+" is an User Thread");
}
}
}输出结果
Thread name is : main Is main thread daemon ? : false Thread-0 is a Daemon Thread Thread-1 is an User Thread