Java to kotlin: a refactoring guidebook, duncan mcgregor, nat pryce 999 ₴

It takes a week to travel the 8,000 miles overland from Java to Kotlin. If
you're an experienced Java developer who has tried the Kotlin language, you
were probably productive in about the same time.

You'll have found that they do things differently in Kotlin, though.
Nullability is important, collections are different, and classes are final by
default. Kotlin is more functional, but what does that mean, and how should it
change the way that you program? And what about all that Java code that you
still have to support?

Your tour guides Duncan and Nat first made the trip in 2015, and they've since
helped many teams and individuals follow in their footsteps. Travel with them
as they break the route down into legs like Optional to Nullable, Beans to
Values, and Open to Sealed Classes. Each explains a key concept and then shows
how to refactor production Java to idiomatic Kotlin, gradually and safely,
while maintaining interoperability.

The resulting code is simpler, more expressive, and easier to change. By the
end of the journey, you'll be confident in refactoring Java to Kotlin, writing
Kotlin from scratch, and managing a mixed language codebase as it evolves over
time.

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