Ex1.java

Gson gson = new Gson();
String json = gson.toJson(new Developer());
System.out.println("********* Compact mode ***********");
System.out.println(json);

GsonBuilder gsonBuilder = new GsonBuilder();
Gson prettyGson = gsonBuilder.setPrettyPrinting().create();
json = prettyGson.toJson(new Developer());
System.out.println("\n ******* Pretty formatting *********");
System.out.println(json);