4. Can we make the user thread as daemon thread if the thread is started?

Can we make the user thread as daemon thread if the thread is started?

Answer

No, if you do so, it will throw IllegalThreadStateException. Therefore, we can only create a daemon thread before starting the thread.

 
  1. class Testdaemon1 extends Thread{    
  2. public void run(){  
  3.           System.out.println("Running thread is daemon...");  
  4. }  
  5. public static void main (String[] args) {  
  6.       Testdaemon1 td= new Testdaemon1();  
  7.       td.start();  
  8.       setDaemon(true);// It will throw the exception: td.   
  9.    }  
  10. }  

Output

Running thread is daemon...

Exception in thread "main" java.lang.IllegalThreadStateException
at java.lang.Thread.setDaemon(Thread.java:1359)
at Testdaemon1.main(Testdaemon1.java:8)

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