java8 stream groupingby多个条件的问题

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Map<Integer,Map<String,List<DocLotDetail>>> amp                            = docLotDetailLists.parallelStream().collect(Collectors.groupingBy(DocLotDetail::getGroupOrder,Collectors.groupingBy(DocLotDetail::getBaseValueName)));

amp.forEach((key,value)->{

        System.out.println(key);

         value.forEach((key2,value2)->{

            System.out.println(key2);

        });

});

最终返回的结果

2

随机光盘

3

资料袋附件

4

资料盒附件

5

包装辅料

8

前工序物料

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