// when the main threads finishes its job child thread doest end class Printer extends Thread { public void start(){ super.start(); } public void run(){ for(int i=0; i<100; i++){ System.out.println("From child thread: "+i); } } } class Main{ public static void main(String[] args){ Printer print = new Printer(); print.start(); for(int i=0; i<10; i++){ System.out.println("From Main thread: "+i); } System.out.println("=========================================="); } }