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Java or Kotlin

If you want to do Android development you should almost certainly be using Kotlin. Most employers (In the US at least) will be looking for Kotlin skills over Java.

However, if the company is super old and slow to adopt technology they might have a large Java code base. So it's also important to know Java.
 
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I read somewhere that Java runs on over 3 billion devices.

three-billion-devices-run-java-yeah-but-do-they-like-it.png
 
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