Daemon Thread

Daemon thread is running in background.
It provides services to user thread.
Daemon thread is like garbage collector, finalizer etc.
It is created automatically by JVM, when a user thread is created.
It is automatically terminated when there is no user thread in the system. In other words, JVM terminates Daemon threads automatically when all the user threads die.
Daemon thread can be seen using the command Jconsole in the command prompt.
The Jconsole tool provides information about the loaded classes, memory usage, running threads etc.
Daemon thread is a low priority thread. Daemon thread performs background support task for user thread.

There are two methods

public void setDaemon (boolean status) :- It is used to mark the current thread as either daemon thread or user thread.
public boolean isDaemon() :- It is used to check whether current thread is daemon thread. It returns true if current thread is daemon thread , otherwise it returns false.

Example 1

public class Exp1 extends Thread {
	public void run() {
	if (Thread.currentThread().isDaemon())
	{
		System.out.println(Thread.currentThread().getName()+" Daemon thread is working");
	}
	else
	{
		System.out.println(Thread.currentThread().getName()+ " User Thread is working");
	}
	}
	
	public static void main(String [] args)
	{
		Exp1 t1 = new Exp1 ();
		Exp1 t2 = new Exp1();
		
		t1.setName("t1");
		t2.setName("t2");
		t1.setDaemon(true);
		
		t1.start();
		t2.start();
	}
}

Output

t1 Daemon thread is working
t2 User Thread is working

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