以上答案都是好的。下面是一个简单的小代码片段，以说明两者的区别。在setDaemon中分别尝试true和false值。

public class DaemonTest {
    
    public static void main(String[] args) {
        new WorkerThread().start();

        try {
            Thread.sleep(7500);
        } catch (InterruptedException e) {
            // handle here exception
        }

        System.out.println("Main Thread ending") ;
    }

}

class WorkerThread extends Thread {
    
    public WorkerThread() {
        // When false, (i.e. when it's a non daemon thread),
        // the WorkerThread continues to run.
        // When true, (i.e. when it's a daemon thread),
        // the WorkerThread terminates when the main 
        // thread or/and user defined thread(non daemon) terminates.
        setDaemon(true); 
    }
    
    public void run() {
        int count = 0;

        while (true) {
            System.out.println("Hello from Worker "+count++);

            try {
                sleep(5000);
            } catch (InterruptedException e) {
                // handle exception here
            }
        }
    }
}

守护线程就像一个普通的线程，除了JVM只会在其他非守护线程不存在时关闭。守护进程线程通常用于为应用程序执行服务。

Daemon threads are those threads which provide general services for user threads (Example : clean up services - garbage collector) Daemon threads are running all the time until kill by the JVM Daemon Threads are treated differently than User Thread when JVM terminates , finally blocks are not called JVM just exits JVM doesn't terminates unless all the user threads terminate. JVM terminates if all user threads are dies JVM doesn't wait for any daemon thread to finish before existing and finally blocks are not called If all user threads dies JVM kills all the daemon threads before stops When all user threads have terminated, daemon threads can also be terminated and the main program terminates setDaemon() method must be called before the thread's start() method is invoked Once a thread has started executing its daemon status cannot be changed To determine if a thread is a daemon thread, use the accessor method isDaemon()

传统上，UNIX中的守护进程是那些不断在后台运行的进程，就像Windows中的服务一样。

Java中的守护线程是不阻止JVM退出的线程。特别是当只剩下守护线程时，JVM将退出。您可以通过调用线程上的setDaemon()方法来创建一个。

读取Daemon线程。

Java中的守护线程是指运行在后台的线程，主要由JVM创建，用于执行后台任务，如垃圾收集和其他家政任务。

注意事项:

Any thread created by main thread, which runs main method in Java is by default non daemon because Thread inherits its daemon nature from the Thread which creates it i.e. parent Thread and since main thread is a non daemon thread, any other thread created from it will remain non-daemon until explicitly made daemon by calling setDaemon(true). Thread.setDaemon(true) makes a Thread daemon but it can only be called before starting Thread in Java. It will throw IllegalThreadStateException if corresponding Thread is already started and running.

Java中守护线程与非守护线程的区别:

1) JVM在存在之前不会等待任何守护线程完成。

2)当JVM终止时，守护线程与用户线程被区别对待，最终块不被调用，堆栈不受伤，JVM只是退出。

守护线程是在程序完成但线程仍在运行时不阻止JVM退出的线程。守护进程线程的一个例子是垃圾收集。

您可以使用setDaemon(boolean)方法在线程启动之前更改线程守护进程属性。