User and Daemon Threads in Java

Java has two types of threads first is User Thread and second is Daemon Thread.A user thread will run its own independently of other threads.Daemon thread is subordinate to a user     thread means a daemon thread will automatically terminate when no more user thread are running.

class mythread extends Thread

{

private int threadnum;

mythread(int n)

{

threadnum=n;

}

public void run()

{

for(int i=0;i<5;i++)

{

try

{

Thread.sleep(500);

}

catch(InterruptedException e)

{

}

System.out.println("Thread number "+ threadnum + " is running");

}

}

}

public class daemonthread

{

public static void main(String aa[])

{

System.out.println("Main thread start");

mythread th1=new mythread(1);

mythread th2=new mythread(2);

mythread th3=new mythread(3);

th1.setDaemon(true);

th2.setDaemon(true);

th3.setDaemon(true);

th1.start();

th2.start();

th3.start();

System.out.println("Main thead finish");

}

}

Explanation….

In above program, the main thread is a user thread which creates three threads th1,th2,th3.So, all these will also be user threads.The statements......

Th1.setDaemon(true);

Th2.setDaemon(true);

Th3.setDaemon(true);

Change the user threads to daemon threads.So when the user thread ends,all the daemon threads also end with it.