public void mainGroup() throws InterruptedException {
        Thread.setDefaultUncaughtExceptionHandler(new Thread.UncaughtExceptionHandler() {
            @Override
            public void uncaughtException(Thread t, Throwable e) {
                System.out.println("I catch a exception from  " + Thread.currentThread().getName() + ":" + Thread.currentThread().getThreadGroup().getName());
            }
        });
        new Thread(new Runnable() {
            @Override
            public void run() {
                System.out.println(Thread.currentThread().getName() + " said my thread group is " + Thread.currentThread().getThreadGroup().getName());
                 new Thread(new Runnable() {
                     @Override
                     public void run() {
                         System.out.println(Thread.currentThread().getName() + " said my thread group is " + Thread.currentThread().getThreadGroup().getName());
                         int i = 1/0;
                     }
                 }, "thread2").start();
            }
        }, "thread1").start();

        Thread.sleep(10);
    }