public class UncaughtExceptionTest1_1 {
    public UncaughtExceptionTest1_1() {
        ThreadGroup group = new MyThreadGroup("Group");

        Thread thread = new Thread(group, new Task(), "task");
        thread.start();

        try {
            while (true) {
                Thread.sleep(10000L);
            }
        } catch (InterruptedException ex) {}
    }

    class MyThreadGroup extends ThreadGroup {
        public MyThreadGroup(String name) {
            super(name);
        }

        public void uncaughtException(Thread t, Throwable e) {
            System.out.println("Uncaught Exception!!!");
            e.printStackTrace();
        }
    }

    class Task implements Runnable {
        public void run() {
            try {
                Thread.sleep(1000L);
            } catch (InterruptedException ex) {}

            throw new RuntimeException();
        }
    }

    public static void main(String[] args) {
        new UncaughtExceptionTest1_1();
    }
}