根据对象属性找交集和差集_实现根据某个属性获取交集,差集集-优快云博客

本文链接：https://blog.youkuaiyun.com/ikigai_6/article/details/129858353

文章讲述了如何在Java中使用StreamAPI来找到列表间的差集和交集。对于单属性的差集比较，通过过滤和映射操作实现。多属性比对时，可以将多个属性连接成一个字符串进行比较。交集的获取则是差集操作的逆过程，保留共同的部分。

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一、差集

根据单一属性找差集

List<GamePoolOffersAddForm> gamePoolOffers = gamePoolAddForm.getGamePoolOffers();

List<GamePoolOffers> poolOffersList = getGamePoolRuleByGamePoolId(cb, gamePoolId);

List<GamePoolOffers> deleteList = poolOffersList.stream().filter(poolOffers-> !gamePoolOffers.stream()
.map(GamePoolOffersAddForm::getOfferUUID).collect(Collectors.toList())
.contains(poolOffers.getPoolOfferUUID())).collect(Collectors.toList());

根据多属性找差集

比如需要两个属性才能比对则

poolOffers.getPoolOfferUUID() + "&" + poolOffers.getId()

以此类推

poolOffers.getPoolOfferUUID() + "&" + poolOffers.getId() + "&" + poolOffers.getStatus()......

二、交集

把过滤条件的取反去掉

List<GamePoolOffersAddForm> gamePoolOffers = gamePoolAddForm.getGamePoolOffers();

List<GamePoolOffers> poolOffersList = getGamePoolRuleByGamePoolId(cb, gamePoolId);

List<GamePoolOffers> deleteList = poolOffersList.stream().filter(poolOffers-> gamePoolOffers.stream()
.map(GamePoolOffersAddForm::getOfferUUID).collect(Collectors.toList())
.contains(poolOffers.getPoolOfferUUID())).collect(Collectors.toList());