Beginning Java 8 Language Features: Lambda Expressions, Inner Classes, Th reads, I/O, Collections,and Streams

// DefaultThreadGroup.javapackage com.jdojo.threads;public class DefaultThreadGroup {        public static void main(String[] args) {                // Get the current thread, which is called "main"                Thread t1 = Thread.currentThread();                // Get the thread group of the main thread                ThreadGroup tg1 = t1.getThreadGroup();                System.out.println("Current thread's name: " + t1.getName());                System.out.println("Current thread's group name: " + tg1.getName());                // Creates a new thread. Its thread group is the same that of the main thread.                Thread t2 = new Thread("my new thread");                ThreadGroup tg2 = t2.getThreadGroup();                System.out.println("New ...