public JSONArray getJSONArray(String key) throws JSONException {
        Object object = this.get(key);
        if (object instanceof JSONArray) {
            return (JSONArray) object;
        }
        throw new JSONException("JSONObject[" + quote(key)
                + "] is not a JSONArray.");
    }
@author Robert HG (254963746@qq.com) on 12/28/15.
lts-core/src/main/java/com/github/ltsopensource/json/JSONObject.java