You should get comfortable with object-oriented programming as a paradigm rather than worrying about which specific languages to learn. Of course you have to pick a language to learn it in (plenty of clean straight-forward implementations: Java, C#, Python etc.) but if it's the programming model that is foreign to you, focus on that. If you understand the concepts/fundamentals well, teaching yourself new languages should be easy. You never know what new language you'll have to work in or what new ones will be invented but learning how to effectively and quickly learn new languages is invaluable.
This upcoming book looks worthwhile: http://www.amazon.com/Seven-Languages-Weeks-Pragmatic-Programming/dp/193435659X/ref=sr_1_1?ie=UTF8&s=books&qid=1280772277&sr=8-1
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You should get comfortable with object-oriented programming as a paradigm rather than worrying about which specific languages to learn. Of course you have to pick a language to learn it in (plenty of clean straight-forward implementations: Java, C#, Python etc.) but if it's the programming model that is foreign to you, focus on that. If you understand the concepts/fundamentals well, teaching yourself new languages should be easy. You never know what new language you'll have to work in or what new ones will be invented but learning how to effectively and quickly learn new languages is invaluable. This upcoming book looks worthwhile: http://www.amazon.com/Seven-Languages-Weeks-Pragmatic-Programming/dp/193435659X/ref=sr_1_1?ie=UTF8&s=books&qid=1280772277&sr=8-1