Daemon Thread in Java - NareshIT

We have various processes, some background, and some foreground. We need to discuss in this article the Daemon Thread in Java, and then we discuss the Daemon thread vs the user thread and compare both of them. And finally, we discuss the methods in Java Daemon Thread. Hence, let's start our article. And you can contact us for your Java training. Naresh I Technologies is the number one computer training institute in Hyderabad and among the top five computer training institutes in India. Contact us anytime for your Java training .?

The thread happens to be a lightweight process. It reduces inefficiency through the prevention of the waste of the CPU cycle. Java is one of the oldest OOPS-based programming languages, and it caters to the use of the full support for Multithreading. Each thread comes with some priority. Some have higher priority and some of them have lower priority. The threads with the priority higher than others go through fast execution. And the threads with lower priority go through the slower execution. Let's clarify now that the Daemon threads in Java are the low-priority threads that execute in the background.

Let's now have the details of the Java Daemon threads. And we will be following the pattern mentioned in the first paragraph to discuss this in detail.

Daemon Thread In Java

These threads cater to us the services in fact to the user method which is running in the background. You should consider it as the thread with a low priority that is made use of for performing the tasks like the garbage collection. And in Java, each of the threads comes with a priority and the thread that has more priority executes first. The JVM terminates the threads without any other intervention, and on its own automatically. You cannot stop it from exiting when each of the user threads gets executed, and even if the daemon threads continue executing via background.

Moving further, we find how the daemon threads distinguish from the non-daemon user threads.

The Daemon Thread Vs User Threads

The main difference between the daemon thread and the user thread is about the JVM. The Java Virtual Machine. The JVM does not wait for the daemon thread to get executed fully, though it does wait for the user thread in this context to execute fully. Let's find some of the distinguishing features between the user threads and the Daemon threads, and they are listed below:

JVM creates the daemon threads, and the application creates the user or the non-daemon threads.

The JVM does not wait for the execution of the JVM though it waits for the execution of the user threads.

The Daemon threads are not so critical background tasks. And the User threads are very critical foreground tasks.?

The user threads have a high priority and the daemon threads have a low priority. The life of the daemon thread depends upon the user threads. Whereas the user threads are independent.

And now you know the difference between the daemon threads and the user threads. Let's now have a program to find whether a provided thread is a user thread or a non-daemon thread or daemon thread.

public class Main extends Thread {

       

        @Override

        public void run() 

        { 

            System.out.println("Non Daemon thread or User thread"); 

        }     

        public static void main(String[] args) 

        { 

       

            Main ob = new Main(); 

            ob.start(); 

           

            System.out.println("It is a " + ob.getName() 

                               + " a Daemon: "

                               + ob.isDaemon()); 

       

            System.out.println("is " + Thread.currentThread().getName() 

                               + " Daemon:" + Thread.currentThread().isDaemon()); 

        } 

}        

It is a Thread-0 a Daemon: false?????????????????????????????????????????????????????????????????????????????????????????????

is main Daemon: false?????????????????????????????????????????????????????????????????????????????????????????????????????????

Non Daemon thread or User thread?????????????

Moving ahead, let’s see different methods in the daemon thread in Java.

Various Methods related to Java Daemon Thread

We have two main methods about the daemon thread in Java, and they are:

Public void setDaemon( Boolean value)

You can mark this thread as a daemon thread or you can mark it as a user thread which is the non-daemon thread.?

Public Boolean isDaemon()

It is applied for testing if the thread is a daemon thread or it is not a Daemon thread. It returns true in case the thread comes out to be a Daemon or else it returns the false value.

Let's have a code for this:

public class Main extends Thread {

       

        @Override

        public void run() 

        { 

            System. out.println("Is it a user thread or Non-Daemon Thread"); 

        }     

        public static void main(String[] args) 

        { 

       

            Main ob1 = new Main(); 

            ob1.start(); 

           

            System.out.println("Is it correct that Its"

                               + " a Daemon Thread: "

                               + ob1.isDaemon()); 

       

            System.out.println("Is it that " + Thread.currentThread().getName() 

                               + " happens to be a Daemom Thread: "

                               + Thread.currentThread().isDaemon()); 

        } 

}        

Output: Is it correct that Its a Daemon Thread: false????????????????????????????????????????????????????????????????????????????????

Is it a user thread or a Non-Daemon Thread?????????????????????????????????????????????????????????????????????????????????????

Is it that main happens to be a Daemon Thread: false?

And this brings us to the end of the article on the Daemon thread. Hope you now know the details of the Daemon thread.?

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FAQ'S

1. What is a Daemon Thread in Java?

A Daemon Thread in Java is a background thread that runs concurrently with other threads in a program. Unlike user threads, daemon threads don't prevent the JVM from exiting. They are often used for tasks like garbage collection, background services, or monitoring.

2. How do I create a Daemon Thread in Java?

To create a daemon thread, you can use the setDaemon(true) method on a Thread object. Here's an example:

Thread daemonThread = new Thread(() -> {

    // Daemon thread's task

});

daemonThread.setDaemon(true);

daemonThread.start();        

3. When should I use Daemon Threads?

Daemon threads are suitable for tasks that can be interrupted or terminated without affecting the overall application. For example, background tasks like logging, monitoring, or network communication can be implemented as daemon threads. However, it's important to ensure that daemon threads don't perform critical operations that could impact the application's behavior.

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