java8 stream().map().collect()用法

 

 具体参考：https://www.cnblogs.com/ngy0217/p/11080840.html

List<CollectionPricePointInfo> collectionPricePointInfos = collectionPricePointInfoService.selectCollectionPricePointInfoList(new CollectionPricePointInfo() {{
            setPointCode(collectionPricePoint.getPointCode());
        }});

        List<Long> cjpzIds = collectionPricePointInfos.stream().map(CollectionPricePointInfo::getVarietiesId).collect(Collectors.toList());
　　　　　//相当于遍历collectionPricePointInfos并且取出每一个的CollectionPricePointInfo的varietiesId
        for (ProductVarieties productVariety : productVarieties) {
            if(cjpzIds.contains(productVariety.getVarietiesId())){
                productVariety.setSearchValue("Y");
            }
        }https://www.cnblogs.com/ngy0217/p/11080840.html