How to put object into JSONObject properly?

Question

I'm trying to fill my JSONObject like this:

JSONObject json = new JSONObject(); json.put("Command", "CreateNewUser"); json.put("User", user); 

user is instance of basic class that contains fields like "FirstName", "LastName" etc.

Looks like I'm doing it wrong, because I get JSON like this:

{     "Command":"CreateNewUser",     "User":"my.package.name.classes.User@2686a150" } 

instead of "tree".

What is wrong with my code?

Answer 1

Since you use JSONObject to represent non-primitive types, any instance passed to JSONObject.put(Object, Object) will generate nested items (or trees).

JSONObject main = new JSONObject(); main.put("Command", "CreateNewUser"); JSONObject user = new JSONObject(); user.put("FirstName", "John"); user.put("LastName", "Reese"); main.put("User", user); 

{     "User": {         "FirstName": "John",         "LastName": "Reese"     },     "Command": "CreateNewUser" }