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There are three kinds of Java variables: Local variables declared in a method, constructor, or block. Local variables are not visible...

Checked exceptions represent invalid conditions in areas outside the immediate control of the program (invalid user input, database problems...

An annotation indicates that the declared element should be processed in some special way by a compiler, development tool, deployment tool, ...

Interface vs. abstract class Choosing interfaces and abstract classes is not an either/or proposition. If you need to change your design,...

Java Language Features Generic Types Enhanced for Loop Autoboxing/Unboxing Enumerated Types Varargs Static Import Metadata (Annotations Gene...

What are design patterns? A pattern is a proven (and recurring) solution to a problem in a context. Each pattern describes a problem whi...

Complexity and Big-O Notation Be careful to differentiate between: Performance: how much time/memory/disk/ ... is actually used when a...