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Ram N

Posts: 2777
Nickname: ramram
Registered: Jul, 2014

Ram N is Java Programmer
Java Tutorial: Java Threads (What happens if we set thread as Daemon thread after thread started) Posted: Dec 22, 2016 1:42 AM
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This post originated from an RSS feed registered with Java Buzz by Ram N.
Original Post: Java Tutorial: Java Threads (What happens if we set thread as Daemon thread after thread started)
Feed Title: JAVA EE
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DisplayThread.java
/*
* public final void setDaemon(boolean on)
*
* Parameters:
* -----------
*
* on - if true, marks this thread as a
* daemon thread
*/


public class DisplayThread extends Thread
{

public void run()
{
/*
* Tests if this thread is a daemon thread.
*/

if (Thread.currentThread().isDaemon())
{
System.out.println("Daemon thread = "
+ Thread.currentThread().getName());
}
else
{
System.out.println("user thread = "
+ Thread.currentThread().getName());
}
}

public static void main(String[] args)
{
DisplayThread t1 = new DisplayThread();
t1.setName("Thread 1");
DisplayThread t2 = new DisplayThread();
t2.setName("Thread 2");
DisplayThread t3 = new DisplayThread();
t3.setName("Thread 3");

t1.start();

/*
* If you want to make a user thread as Daemon, it
* must not be started otherwise it will throw
* IllegalThreadStateException.
*
* below line will throw
* IllegalThreadStateException, because t1 thread is
* started already.
*/

t1.setDaemon(true);
t2.start();
t3.start();
}
}
Output
Exception in thread "main" java.lang.IllegalThreadStateException
at java.lang.Thread.setDaemon(Thread.java:1352)
at DisplayThread.main(DisplayThread.java:51)
user thread = Thread 1

Click the below link to download the code:
https://sites.google.com/site/ramj2eev1/home/javabasics/ThreadDemo_daemon_exp_app.zip?attredirects=0&d=1

Github Link:
https://github.com/ramram43210/Java/tree/master/BasicJava/ThreadDemo_daemon_exp_app

Bitbucket Link:
https://bitbucket.org/ramram43210/java/src/0fa116261fbf2fe2bc94946e6ef3f543aabbf896/BasicJava/ThreadDemo_daemon_exp_app/?at=master

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