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Three JVM-based languages in the list will complement your skills in Java and enrich your arsenal. Scala is still the language to learn for Java developers. Java is actively used for mobile development and web and Big Data solutions. Scala developers are so much in demand that it is a good choice to learn it well. The best Java developer to learn is in Norway, which makes $10,000 per month per year, and the highest salary is in the country, Norway, where developers are paid 120K per year.