Demon threads continue to run after main exited and there is some non-daemon thread still running?

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I know that all Demon threads are terminated after main exits. But what if there is some non-daemon thread which continues to run after main exited? Does running of this non-daemon thread prevent all other daemon threads from terminating?

Demon threads continue to run after main exited and there is some non-daemon thread still running?

Daemon thread in Java, Which method is used to check if a thread is running? In Java, there are two types of threads: Daemon Thread; User Thread; Daemon threads are low priority threads which always run in background and user threads are high priority threads which always run in foreground. User Thread or Non-Daemon are designed to do specific or complex task where as daemon threads are used to perform supporting tasks.

The runtime shuts down when all non-daemon threads have stopped. So, if you start another non-daemon thread, such as the event queue, the application keeps running.

Java Questions & Answers – isAlive(), Join() & Thread , is a low priority thread which runs intermittently in the back ground doing the garbage collection operation or other requests for the java runtime system. Daemon Thread in Java. Daemon thread in java is a service provider thread that provides services to the user thread. Its life depend on the mercy of user threads i.e. when all the user threads dies, JVM terminates this thread automatically. There are many java daemon threads running automatically e.g. gc, finalizer etc.

Why not checking it yourself ??

public static void main(String[] ...){
Thread t1=new Thread(()=>{for(;;);});
t1.setDeamon(true);

Thread t2=new Thread(()=>{for(;;){System.out.println(new Date())}});
t2.setDeamon(false);

t1.start();
t2.start();
Thread.currentThread().sleep(1000);
}

And check if JVM was terminated or not. If your CPU is 100% busy, then not.

Is garbage collector a daemon thread?, Daemon thread is a low priority thread (in context of JVM) that runs in JVM terminates itself when all user threads (non-daemon threads) finish their execution, thread (upon completion of user threads), it terminates the thread and after that If you create additional threads in the main method those threads would be the  Previous Next In Java, any thread can be a Daemon thread. Daemon threads are like a service providers for other threads or objects running in the same process as the daemon thread. Daemon threads are used for background supporting tasks and are only needed while normal threads are executing. In java we have two types of Threads: Daemon Thread and User Threads. Generally all threads created by

Daemon thread in Java with example, If normal threads are not running and remaining threads are daemon Any thread created by main thread, which runs main method in Java is by and since main thread is a non daemon thread, any other thread created JVM doesn't wait for any daemon thread to finish before exiting. continues to run. Yes. A program exits when all non-daemon threads have finished. If main starts a non-daemon thread which is running, having the thread called "main" exit doesn't do anything.

What is Daemon Thread in Java? Example Attached • Crunchify, Daemons are only useful when the main program is running, and it's okay to thread as a daemon that runs without blocking the main program from exiting. Using daemon threads is useful for services where there may not be an easy After 3 seconds, the join was timed out, and the daemon thread is still alive and sleep. daemon threads Daemons are only useful when the main program is running, and it's okay to kill them off once the other non-daemon threads have exited. Without daemon threads, we have to keep track of them, and tell them to exit, before our program can completely quit.

Python Multithreading Tutorial: daemon threads & join method, Daemon thread is a low priority thread that runs in background to perform They can not prevent the JVM from exiting when all the user threads finish their execution. running daemon thread, it terminates the thread and after that shutdown itself. Exception as the thread is already started. t1.setDaemon( true );. t2.start();. }. Some threads do background tasks, like sending keepalive packets, or performing periodic garbage collection, or whatever. These are only useful when the main program is running, and it’s okay to kill them off once the other, non-daemon, threads have exited.

Comments
  • "I know" Obviously you don't, because daemon threads don't terminate after main exits. They terminate when the JVM exits, which happens when System.exit() is called, or all non-daemon threads have terminated. So to answer your question: Yes, there would be at least one non-daemon thread still running, preventing JVM shutdown.
  • What is that supposed to show? Both threads end before main ends, so it showcases nothing. Also, there are at least 3 errors in the code: ->, missing ), undeclared variables, and misspelled setDaemon.
  • @Andreas yeah I was in hurry and realised that just now, after walking away from computer. Fixed - Damn you are so quick :)