针对List《Map《String，Object》》多条件组合排序_list<map<string, object>> 多条件排序-优快云博客

本文链接：https://blog.youkuaiyun.com/jxwen1/article/details/105370352

本文介绍了一种对List<Map>集合中元素按多个字段进行排序的方法，通过示例代码展示了如何首先按score字段升序排序，相同分数时再按id字段升序排序。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

需求: 对List<Map<String,Object>> 中map的value进行多字段组合排序

话不多说, 直接上代码:

public static void main(String[] args) {

        List<Map<String,Object>> list = new ArrayList<>();
        Map<String, Object> map1 = new HashMap<>();
        map1.put("id","1");
        map1.put("code","1234");
        map1.put("score",90);
        map1.put("rate","88%");
        list.add(map1);
        Map<String, Object> map2 = new HashMap<>();
        map2.put("id","2");
        map2.put("code","2345");
        map2.put("score",70);
        map2.put("rate","60%");
        list.add(map2);
        Map<String, Object> map3 = new HashMap<>();
        map3.put("id","3");
        map3.put("code","3456");
        map3.put("score",70);
        map3.put("rate","50%");
        list.add(map3);
        Map<String, Object> map4 = new HashMap<>();
        map4.put("id","4");
        map4.put("code","4567");
        map4.put("score",80);
        map4.put("rate","90%");
        list.add(map4);
        Map<String, Object> map5 = new HashMap<>();
        map5.put("id","5");
        map5.put("code","5678");
        map5.put("score",88);
        map5.put("rate","80%");
        list.add(map5);

        Collections.sort(list, new Comparator<Map<String,Object>>() {

            @Override
            public int compare(Map<String, Object> o1, Map<String, Object> o2) {
                String score1 = String.valueOf(o1.get("score"));
                String score2 = String.valueOf(o2.get("score"));
                int c = score1.compareTo(score2);
                if(c != 0)
                    return c;

                String i1 = String.valueOf(o1.get("id"));
                String i2 = String.valueOf(o2.get("id"));
                return i1.compareTo(i2);
            }
        });

        System.out.println(list.toString());

    }

结果:

排序前: [{score=60, code=1234, rate=88%, id=1}, {score=70, code=2345, rate=60%, id=2}, {score=70, code=3456, rate=50%, id=3}, {score=60, code=4567, rate=90%, id=4}, {score=88, code=5678, rate=80%, id=5}]
排序后: [{score=60, code=1234, rate=88%, id=1}, {score=60, code=4567, rate=90%, id=4}, {score=70, code=2345, rate=60%, id=2}, {score=70, code=3456, rate=50%, id=3}, {score=88, code=5678, rate=80%, id=5}]

先对score进行升序排序, 相同分数则对id进行升序排序.

若想进行降序排序, 则只需把compareTo两边的参数互换即可;

仅供参考!