Exe3.java

Gson gson = new Gson();

System.out.println("Default behaviour ");
GsonBuilder gsonBuilder = new GsonBuilder();
Gson prettyGson = gsonBuilder.setPrettyPrinting().create();
String json = prettyGson.toJson(new Developer());
System.out.println(json);

System.out.println("Ignoring/excluding fields ");

GsonBuilder excludeFieldsWithModifiers = gsonBuilder
    	.excludeFieldsWithModifiers(Modifier.PRIVATE);

Gson create = excludeFieldsWithModifiers.create();
String json2 = create.toJson(new Developer());
System.out.println(json2);