public class Main {
    public static void main(String[] args) {
        new Thread(){
            { this.setDaemon(true); }

            public void run() {
                while(true) {
                    System.out.println("Thread is running!");
                }
            }
        }.start();
    }
}

public class Main {
    public static void main(String[] args) {
        new Thread() {

            public void run() {
                while(true) {
                    System.out.println("Thread is running!");
                }
            }
        }.start();
    }
}