Java等待所有线程运行结束

 public static void main(String[] args) {
        ExecutorService es = Executors.newCachedThreadPool();
        for(int i=0;i<5;i++){
            /*  your task */
            es.execute(() -> {

            });
        }
        es.shutdown();
        boolean finished = es.awaitTermination(1, TimeUnit.MINUTES);
    // 所有任务都已完成或时间已到。.
    }