Thread mainThread = new Thread(new Runnable() {
                @Override
                public void run() {
                    Thread sub1 = new Thread(new Runnable() {
                        @Override
                        public void run() {

                        }
                    });
                    Thread sub2 = new Thread(new Runnable() {
                        @Override
                        public void run() {

                        }
                    });
                    Thread sub3 = new Thread(new Runnable() {
                        @Override
                        public void run() {

                        }
                    });
                    Thread sub4 = new Thread(new Runnable() {
                        @Override
                        public void run() {

                        }
                    });

                    sub1.start();
                    sub2.start();
                    sub3.start();
                    sub4.start();
                }
            });
          es.submit(mainThread);