问题描述
我已经看到其他几个与这个问题类似的问题,但我真的找不到任何可以解决我的问题的问题.
I've seen several other questions similiar to this one but I haven't really been able to find anything that resolves my problem.
我的用例是这样的:用户最初有一个项目列表(listA).他们对项目重新排序并希望保留该订单(listB),但是,由于限制,我无法在后端保留订单,因此我必须在检索到 listA 后对其进行排序.
My use case is this: user has a list of items initially (listA). They reorder the items and want to persist that order (listB), however, due to restrictions I'm unable persist the order on the backend so I have to sort listA after I retrieve it.
所以基本上,我有 2 个 ArrayList(listA 和 listB).一个具有列表应该在(listB)中的特定顺序,另一个具有项目列表(listA).我想根据 listB 对 listA 进行排序.
So basically, I have 2 ArrayLists (listA and listB). One with the specific order the lists should be in (listB) and the other has the list of items (listA). I want to sort listA based on listB.
推荐答案
使用 Java 8:
Collections.sort(listToSort,
Comparator.comparing(item -> listWithOrder.indexOf(item)));
或更好:
listToSort.sort(Comparator.comparingInt(listWithOrder::indexOf));
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