java比较两个map获取相同key值

    
    public static Map mapDifferent(Map map, Mapmapbefore){
        Map mapbeforeAll = new HashMap<>();
        // 获取前后更改后的相同key值
        if (!CommonUtils.isEmpty(map)) {
            for (String key1 : map.keySet()) {
                if (!CommonUtils.isEmpty(map.get(key1)) && !CommonUtils.isEmpty(mapbefore.get(key1))) {
                    String map1value = map.get(key1).toString();
                    String map2value = mapbefore.get(key1).toString();
                    if (!map1value.equals(map2value)) {
                        mapbeforeAll.put(key1, map2value);
                    }
                }
            }
        }
        return mapbeforeAll;
    }