On 3/1/23 19:18, e.d.pro...@gmail.com wrote:
> I just saw they added a new thing called record to Java 16. Is this not a replacement for a DTO or am I missing something?
> I create a DTO class like:
> public class TestDTO {
> private String testField;
> public String getTestField() {
> return this.testField;
> }
> public void setTestField(String test) {
> this.testField = test;
> }
> }
>
> I define a matching record definition like:
> public record TestRecordDTO(String testField) {
>
> }
>
> Now I try to test them:
> public static void main(String[] args) {
> TestRecordDTO rec = new TestRecordDTO("testrec");
>
> TestDTO dto = new TestDTO();
> dto.setTestField("testrec");
>
> Gson gson = new Gson();
> System.out.println(gson.toJson(rec)); // {"testField":"testrec"}
> System.out.println(gson.toJson(dto)); // {"testField":"testrec"}
> rec.testField();
> dto.getTestField();
>
> dto = gson.fromJson(gson.toJson(dto), TestDTO.class);
> System.out.println(dto.getTestField()); // testrec
> rec = gson.fromJson(gson.toJson(rec), TestRecordDTO.class); // throws AssertionError
> System.out.println(rec);
> }
>
> In web, we use DTOs on the back end to pass data to and from the Javascript/Typescript on the front end. It looks like passing to the front end works, now how do we use it as a model to get the user input?

I encountered this when I Googled how to do structs in Java. The answer
was not before 16 (though really, a class with a bunch of public
variables will do, if that's what you need).

> > In web, we use DTOs on the back end to pass data to and from the Javascript/Typescript on the front end. It looks like passing to the front end works, now how do we use it as a model to get the user input?
> I encountered this when I Googled how to do structs in Java. The answer
> was not before 16 (though really, a class with a bunch of public
> variables will do, if that's what you need).
Sounds like a record is a class with public final variables.