ExecutorService.invokeAll不支持可运行任务的集合

只需将可运行对象转换为可调用对象：

List<Callable<Void>> callables = new ArrayList<>();for (Runnable r : runnables) {    callables.add(toCallable(r));}executor.invokeAll(callables);private Callable<Void> toCallable(final Runnable runnable) {    return new Callable<Void>() {        @Override        public Void call() { runnable.run(); return null;        }    };}