java - 等待子线程执行结束再继续执行

用CountDownLatch， 在主线程里用 latch.await() 挂起主线程，等待子线程执行完毕再继续执行

      final CountDownLatch latch = new CountDownLatch(1);
                                            new Thread() {
                                                @Override
                                                public void run() {
                                                    super.run();
                                                    lastBillingOkTimeMap = time;
                                                  //子线程结束
                                                    latch.countDown();
                                                }
                                            }.start();
                                            try {
                                                //挂起主线程，等待子线程结束，再继续执行主线程                             latch.await();
                                            } catch (InterruptedException e) {
                                                e.printStackTrace();
                                            }
                                            adaptCoupon(list.get(0), kind);