Example33.java

public class Example33 {
  public static void main(String[] args) {
    Gson gson = new GsonBuilder().setVersion(2.0).create();
    String json = gson.toJson(new ExampleClass());
    System.out.println("Output for version 2.0...");
    System.out.println(json);
    
    gson= new GsonBuilder().setVersion(1.0).create();
    json = gson.toJson(new ExampleClass());
    System.out.println("\nOutput for version 1.0...");
    System.out.println(json);
    
    gson= new Gson();
    json = gson.toJson(new ExampleClass());
    System.out.println("\nOutput for No version set...");
    System.out.println(json);
  }
}

class ExampleClass{
  String field=  "field";
  // this is in version 1.0
  @Since(1.0) String newField1 = "field 1";
  // following will be included in the version 1.1
  @Since(2.0) String newField2 = "field 2";
}