java - Daemon thread not working as expected -

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package main.components;  import java.io.serializable; import java.util.scanner; import java.util.concurrent.timeunit;  public class mainsnoozerx implements runnable, serializable {      private static final long serialversionuid = 1l;     private static int min = 0;     static thread mnz = new thread(new mainsnoozerx());     private long convertedtomilisec = 0l;     private scanner scn = new scanner(system.in);      @override     public void run() {         // todo auto-generated method stub         try{             do{             system.out.println("enter minutes snooze..");             min = scn.nextint();             }while(min<0);          convertedtomilisec = timeunit.minutes.tomillis(min);         try {             thread.sleep(convertedtomilisec);         } catch (interruptedexception e) {             // todo auto-generated catch block             e.printstacktrace();         }          system.out.println("alarm now!!!");         }catch (exception e) {             // todo auto-generated catch block             e.printstacktrace();         }     }      public static void main(string[] args) {         // todo auto-generated method stub         mnz.setdaemon(true);         mnz.start();     }  }

can tell me doing wrong/missing? program terminates when run without printing syso once. expect code run endlessly being daemon thread , user sets mins once , snooze goes on forever...

you fired thread without ever tell java want work done back. need add mnz.join() after start ;)

with fix, thread run 1 time sure. if decide put run() code inside of while loop , change loop, got behaviour want.

like this

@override public void run() {     while (true) {         // todo auto-generated method stub         try {             while (min == 0) {                 system.out.println("enter minutes snooze..");                 min = scn.nextint();             }              convertedtomilisec = timeunit.minutes.tomillis(min);             try {                 thread.sleep(convertedtomilisec);             } catch (interruptedexception e) {                 // todo auto-generated catch block                 e.printstacktrace();             }              system.out.println("alarm now!!!");         } catch (exception e) {             // todo auto-generated catch block             e.printstacktrace();         }     } } public static void main(string[] args) throws interruptedexception {     // todo auto-generated method stub     mnz.setdaemon(true);     mnz.start();     mnz.join(); }

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