Thread Tutorial in Java

public class Main {
  public static void main(String[] args) {
    Thread t1 = Thread.currentThread();

    ThreadGroup tg1 = t1.getThreadGroup();

    System.out.println("Current thread's  name:  " + t1.getName());
    System.out.println("Current thread's  group  name:  " + tg1.getName());

    Thread t2 = new Thread("my  new thread");

    ThreadGroup tg2 = t2.getThreadGroup();
    System.out.println("New  thread's name:  " + t2.getName());
    System.out.println("New  thread's  group  name:  " + tg2.getName());
  }
}