November 2023
Intermediate to advanced
401 pages
7h 53m
Chinese
Content preview from Java到Kotlin：代码重构指南
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
302
|
第
19
章
object Excluded : RegistrationProblem()
data
class Duplicate(
val message: String?
)
: RegistrationProblem()
fun register(data: RegistrationData):
Result<Customer, RegistrationProblem>
}
sealed
class RegistrationProblem
示例
19.34 [errors.25:src/main/java/travelator/IRegisterCustomers.kt]
interface Customers {
fun add(name:String, email:String): Result<Customer, DuplicateException>
fun find(id: String): Optional<Customer>
}
示例
19.35 [errors.25:src/main/java/travelator/Customers.kt]
由于
DuplicateException
的存在，所以不是完全没有异常。它实际上不再从任何
地方被抛出，只是被创建并放到一个
Failure
中。我们可以通过将这个类重命名为
DuplicateCustomerProblem
并停止它对
Exception
的扩展来解决这个问题，或者重新
使用
RegistrationProblem
的现有
Duplicate ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.