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While very few people in physics use Java for anything serious, it is still a good idea to learn the fundamental concepts behind Java and object-oriented programming. Learning different paradigms of programming will make programming more natural, and OOP is the most widely used paradigm today (though it's rather lacking in the sciences). On the other hand, if you're already proficient in multiple languages, intro java classes might be completely below you, and you'll be extremely bored. You have to really want to learn the concepts, not just the execution, for it to be interesting.