list的Lamdba分组聚合

List<Map<String,Object>> query = new ArrayList<>();
        Map<String, Object> e1 = new HashMap<>();
        e1.put("number",3);
        e1.put("name","1");
        e1.put("age","0101019");
        e1.put("yuefen",3);
        e1.put("price",500);
        query.add(e1);

        Map<String, Object> e2 = new HashMap<>();
        e2.put("number",99);
        e2.put("name","1");
        e2.put("age","A001");
        e2.put("yuefen",3);
        e2.put("price",300);
        query.add(e2);

        Map<String, Object> e3 = new HashMap<>();
        e3.put("number",44);
        e3.put("name","1");
        e3.put("age","A002");
        e3.put("yuefen",5);
        e3.put("price",300);
        query.add(e3);
        List<List<Map<String,Object>>>  listOne = new ArrayList<>();
        query.stream().collect(Collectors.groupingBy(m -> m.get("name").toString()+"#"+m.get("price"))).forEach((k,value)->{
            listOne.add(value);
        });
        System.out.println(listOne);

简单暴力：直接看结果

[{number=3, price=500, name=1, yuefen=3, age=3}], 
[{number=99, price=300, name=1, yuefen=3, age=4},{number=44, price=300, name=1, yuefen=5, age=5}]
    ]

最后

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