How to convert hashmap to JSON object in Java

Question

How to convert or cast hashmap to JSON object in Java, and again convert JSON object to JSON string?

Answer 1

You can just enumerate the map and add the key-value pairs to the JSONObject

Method :

private JSONObject getJsonFromMap(Map map) throws JSONException {
    JSONObject jsonData = new JSONObject();
    for (String key : map.keySet()) {
        Object value = map.get(key);
        if (value instanceof Map) {
            value = getJsonFromMap((Map) value);
        }
        jsonData.put(key, value);
    }
    return jsonData;
}