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Ya, if you've never programmed in Java, Kotlin or Scala on the JVM before, this is definitely an additional learning that all JVM languages have.

But if you're already familiar with any of those, it'll be the same as what you're used too.

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To a degree. Interop is useful, but you can getby with most of things without it. Long term you will learn interop as it's often times easier to write small piece of code to take java lib, rather than trusting in community wrappers.

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