展平和取消展平HashMap的最佳方法

public static Map<String, Object> flattenMap(Map<String, Object> map) {
    Map<String, Object> result = new HashMap<>();
    for (Map.Entry<String, Object> entry : map.entrySet()) {
        if (entry.getValue() instanceof Map) {
            Map<String, Object> nestedMap = flattenMap((Map<String, Object>) entry.getValue());
            for (Map.Entry<String, Object> nestedEntry : nestedMap.entrySet()) {
                result.put(entry.getKey() + "." + nestedEntry.getKey(), nestedEntry.getValue());
            }
        } else {
            result.put(entry.getKey(), entry.getValue());
        }
    }
    return result;
}

public static Map<String, Object> unflattenMap(Map<String, Object> flatMap) {
    Map<String, Object> result = new HashMap<>();
    for (Map.Entry<String, Object> entry : flatMap.entrySet()) {
        String[] keys = entry.getKey().split("\\.");
        Map<String, Object> nestedMap = result;
        for (int i = 0; i < keys.length - 1; i++) {
            if (!nestedMap.containsKey(keys[i])) {
                nestedMap.put(keys[i], new HashMap<String, Object>());
            }
            nestedMap = (Map<String, Object>) nestedMap.get(keys[i]);
        }
        nestedMap.put(keys[keys.length - 1], entry.getValue());
    }
    return result;
}