What are the most important topics in Java that are less known to programmers?

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Minakshi Joshi

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Abstraction, Interface, Multithreading, collection s
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Multithreading topics, string tokenizer topic, own package creation and usage, oops concepts
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Run time polymorphism is one of the most underrated topics..also,Java based DESIGN PATTERNS which are now also added to OCP exam are also very very important.
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Memory management, Static blocks, Atomic variables, Autoboxing
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