How to parse JSON file?

Question

Simple situation -

1. read a json file
2. discover all key-value pairs
3. compare key-value pairs

I tried gson, package from json.org,

Answer 1

XStream is good for JSON: http://x-stream.github.io/json-tutorial.html

Due to XStream's flexible architecture, handling of JSON mappings is as easy as handling of XML documents. All you have to do is to initialize XStream object with an appropriate driver and you are ready to serialize your objects to (and from) JSON.