How to enable pretty printing in Google gson APIs?

package com.java2novice.json.gson;

import java.util.HashMap;
import java.util.Map;

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;

public class MapToJsonEx {

	public static void main(String a[]){
		
		Map<String, String> inputMap = new HashMap<String, String>();
		inputMap.put("name", "Java2Novice");
		inputMap.put("site", "http://java2novice.com");
		// convert map to JSON String
		// notice that we enabled pretty printing in the below line
		Gson gsonObj = new GsonBuilder().setPrettyPrinting().create();
		String jsonStr = gsonObj.toJson(inputMap);
		System.out.println(jsonStr);
	}
}

{
  "site": "http://java2novice.com",
  "name": "Java2Novice"
}