November 2022
Beginner to intermediate
544 pages
12h 39m
Korean
Content preview from 자바에서 코틀린으로
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415
19
장
예외 던지기에서 값 반환으로
예제
19.20
[
errors
.
15
:
src
/
main
/
java
/
travelator
/
Customers
.
kt
]
interface Customers {
fun add(name:String, email:String): Result<Customer, DuplicateException>
fun find(id: String): Optional<Customer>
}
IRegisterCustomers
는 여전히 자바 코드이며 여전히 두 가지 예외를 던진다.
예제
19.21
[
errors
.
15
:
src
/
main
/
java
/
travelator
/
IRegisterCustomers
.
java
]
public interface IRegisterCustomers {
Customer register(RegistrationData data)
throws ExcludedException, DuplicateException;
}
CustomerRegistration
은 이제 코틀린 코드이며, 이제는
Result
.
Error
를
throw
를 사용해
DuplicateException
로 연결해 준다.
예제
19.22
[
errors
.
15
:
src
/
main
/
java
/
travelator
/
CustomerRegistration
.
kt
]
class CustomerRegistration( ...