public short getShortValue(String key) {
        Short value = getShort(key);
        return value == null ? 0 : value;
    }
Returns a short value of the associated keys in this {@link JSONObject}.

@param key the key whose associated value is to be returned
@return short
@throws NumberFormatException If the value of get is {@link String} and it contains no parsable short
@throws JSONException Unsupported type conversion to short value
core/src/main/java/com/alibaba/fastjson2/JSONObject.java