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  • Java 8 新特性对比

    前景

    找到子集  or 兄弟

    多规格商品  

     private List<Commodity> toCommodityRepresentation(List<Commodity> commodities){
            List<CommodityStock> stocks=commodityStockMapper.findByIds(commodities);
    
            List<Commodity> commodityList = commodities.stream().filter(w -> w.getItemId() != 0).map(w -> {
            //同itemid 不同ID List
    <CommodityStock> goodsItems = stocks.stream().filter(localW -> localW.getId() != w.getId() && localW.getItemId() == w.getItemId()).collect(Collectors.toList()); if(goodsItems.size() > 1){ logger.error("数据错误,同一条码最多只能存在两种规格,scp_item id:{}",w.getId()); } if(goodsItems.size() > 0){ w.setCommodityStock(goodsItems.get(0)); } return w; }).collect(Collectors.toList()); return commodityList; }
     private List<Commodity> toCommodityRepresentation(List<Commodity> commodities){

        List<CommodityStock> stocks=commodityStockMapper.findByIds(commodities);
            Map<Long,CommodityStock> boxMap=new HashMap<>();
            Map<Long,CommodityStock> scatterMap=new HashMap<>();
    
            for (int i = 0; i < stocks.size(); i++) {
                CommodityStock stock=stocks.get(i);
                int bulk=stock.getBulk();
                long itemId=stock.getItemId();
                if(bulk==0){
                    boxMap.put(itemId,stock);
                }else{
                    scatterMap.put(itemId,stock);
                }
            }
            for (int i = 0; i <commodities.size() ; i++) {
                Commodity commodity=commodities.get(i);
                int bulk=commodity.getBulk();
                long itemId=commodity.getItemId();
                if(bulk==0 && !scatterMap.isEmpty() && scatterMap.containsKey(itemId)){
                    commodity.setCommodityStock(scatterMap.get(itemId));
                }
                if(bulk==1 && !boxMap.isEmpty() && boxMap.containsKey(itemId)){
                    commodity.setCommodityStock(boxMap.get(itemId));
                }
            }
            return  commodities;
    }
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  • 原文地址:https://www.cnblogs.com/lanliying/p/14083936.html
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