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by jsmartonly 4909 days ago
It depends what you want.

A) If you want to make more money or look for career change, then you have to listen to market and learn whatever it needs or pays well.

B) If your goal is to do long term career investment, then keep learning Java and make yourself an expert of it. To become "expert", you inevitably will have to learn a lot things that are beyond Java language and platform. Later on, these knowledge can be easily reused in other languages.

A) is short term, B) is long term. How about allocate 50% of your learning to each of them, then adjust allocation when you feel you need to?