How to retrieve json string from dynamic object??

I am new to Java and web services. I have to extract/retrieve values from following dynamic JSON object which is into another object. Thanks in advance.

JSON payload:

addresses{2} addressOne{12}-----------this object is changing when service being called zipcode : "values" city : "values"

I need to extract values (ie: zipcode, city) from dynamic object (addressOne) which always change when web service is being called.