public class Init {

	ThreadGroup tgr = new ThreadGroup(null);
	
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		new Init().go();	
	}
	
	public void go(){
		method1();
		method2();		
	}
	
	public void method1(){

		  for (int i = 0; i < 5; i++) {
		    new Thread(tgr, new Runnable(){
				@Override
				public void run() {
					// TODO Auto-generated method stub
					while(true){
						System.out.println("hello "+ this);
						try {
							Thread.sleep(500);
						} catch (InterruptedException e) {
							// TODO Auto-generated catch block
							e.printStackTrace();
						}
					}
				}		    	
		    }).start();
		  }		
	}
	
	@SuppressWarnings("deprecation")
	public void method2(){
		try {
			Thread.sleep(5000);
		} catch (InterruptedException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		tgr.stop();
	}
}