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Design Patterns in Java: A Practical Introduction
What Are Design Patterns? A design pattern is a reusable, proven solution to a recurring design problem — not a finished piece of code you copy-paste, but a template for how to structure classes and objects to solve a specific kind of problem. The idea was popularized by the “Gang of Four” (Erich Gamma, Richard Helm, Ralph Johnson, and John Vlissides) in their 1994 book Design…