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

public class App {
    public static void main(String[] args) throws Exception {
        Employee emp = new Employee("Csendes Imre", "Szeged", 342);
        
        GsonBuilder builder = new GsonBuilder();
        builder.setPrettyPrinting();
        Gson gson = builder.create();
        String jsonStr = gson.toJson(emp);
        System.out.println(jsonStr);
    }
}