Java Generic Response Issue in Spring Boot-CodePudding

I have a problem about making a jeneric response for this method in my Spring Boot example. In signup, there are two response type (Generic message and UserDto). That's why I want to use jeneric response but I couldn't do that.

How can I do that?

Here is the method shown below.

public (Generic Resposne) signup(SignUpRequest signUpRequest){
    ....
    return MessageResponse.builder()
                    .message("Error: Username is already taken!")
                    .build();
    ....
    return UserDto.builder()
                .id(user.getId())
                .username(user.getUsername())
                .build();
}

CodePudding user response：

You can create an interface and implement both other types with it.

public interface Response

public class UserDto implements Response

public class MessageResponse implements Response

public Response signup(SignUpRequest signUpRequest){
    ....
    return MessageResponse.builder()
                    .message("Error: Username is already taken!")
                    .build();
    ....
    return UserDto.builder()
                .id(user.getId())
                .username(user.getUsername())
                .build();
}