java List＜Map＞去重

最新推荐文章于 2023-12-07 10:30:37 发布

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最新推荐文章于 2023-12-07 10:30:37 发布

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文章标签： java

本文链接：https://blog.youkuaiyun.com/yangziqi098/article/details/118360349

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public static List<Map<String, Object>> removeRepeatMapByKey(List<Map<String, Object>>list, String mapKey){
    if (CollectionUtils.isNullOrEmpty(list)) return null;

    List<Map<String, Object>> listMap = new ArrayList<>();
    Map<String, Map> msp = new HashMap<>();
    for(int i = list.size()-1 ; i>=0; i--){
        Map map = list.get(i);
        String id =  map.get(mapKey).toString();//错误举例 (String)map.get(mapKey);
        map.remove(mapKey);
        msp.put(id, map);
    }
    Set<String> mspKey = msp.keySet();
    for(String key: mspKey){
        Map newMap = msp.get(key);
        newMap.put(mapKey, key);
        listMap.add(newMap);
    }
    return listMap;
}