How to output my JSONObject, but nicer with different lines and indentation?

Question

I am using Java and I have:

Boolean happiness;

JSONObject happyJSON = new JSONObject();

happyJSON.put("happy", happiness);

-

So right now, when the boolean is true, my output (in a jsonfile) looks like this:

{"happiness":true}

But I am trying to output it like this:

{
       "happiness":true
}

On three different lines, with the proper indentation. Thank you for your advice.