java - 如何声明一个方法引用数组？

Question

我知道如何用这种方式声明其他东西的数组，比如字符串:

String[] strings = { "one", "two", "tree" };
// or
String[] strings = new String[] { "one", "two", "tree" };

但是当涉及到方法引用时，我想不出如何避免创建一个列表并单独添加每个项目。

示例:在多个不同的节点上调用方法smartListMerge来自两个来源的匹配列表:

List<Function<TodoUser, TodoList>> listGetters = new ArrayList<>(3);
listGetters.add(TodoUser::getPendingList);
listGetters.add(TodoUser::getCompletedList);
listGetters.add(TodoUser::getWishList);

TodoUser userA = ..., userB = ...;
for (Function<TodoAppUser, TodoList> listSupplier : listGetters) {
    TodoList sourceList = listSupplier.apply(userA);
    TodoList destinationList = listSupplier.apply(userB);

    smartListMerge(sourceList, destinationList);
}

声明方法引用数组的正确方法是什么？

Answer 1

创建列表有更短的方法:

List<Function<TodoUser, TodoList>> listGetters = Arrays.asList(TodoUser::getPendingList,
                                                               TodoUser::getCompletedList,
                                                               TodoUser::getWishList);

或(在 Java 9 中):

List<Function<TodoUser, TodoList>> listGetters = List.of(TodoUser::getPendingList,
                                                         TodoUser::getCompletedList,
                                                         TodoUser::getWishList);