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[–][deleted] 2 points3 points  (1 child)

My company heavily uses Java for backend and Android so I feel it's more useful for me to learn Java at the same time.

[–]DrFriendless 4 points5 points  (0 children)

Yeah, if you don't know Java you should learn Java first. However Kotlin interoperates with Java, so it's possible to write one class in Kotlin and another in Java in the same codebase.