Is Java worth learning in 2020?

Yes, JAVA is there for many many years again. Billions of devices around the world are powered by JAVA variants. There are also many proprietary Java-based frameworks in many companies.

Even if people or companies want to replace in the future their huge or we can say large Java codebase by another language, we will have to deal with the same case/situation like what is happening now with COBOL language (I mean some critical parts of the global system will not be swapped). We may still have some Java codebase and others part of the system in other language. That also means, people with Java skill will be needed (maybe not too much people) for maintaining these kind of hybrid language system.

In short, having Java programming skill into your toolset is very important as a developer.

But its important to learn other tool also like Salesforce , Deveops etc.

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