Revision Notes/Design Patterns
Field Entry - Design Patterns
Bridge Pattern
Decouples an abstraction from its implementation so that the two can vary independently — preventing a class explosion when you have multiple dimensions of variation.
Field Note - Real-world Analogy
“Think of a TV remote control (abstraction) and the TV (implementation). You can use the same remote design with different TV brands. And different remote designs can control the same TV. The remote and TV vary independently because they're connected through a standardized IR signal interface — the bridge.”
Field Observations - Key Topics Covered
The problem Bridge solves: suppose you have a Shape class with Circle and Square subclasses, and you also need Dark and Light color variants. With inheritance alone, you need DarkCircle, LightCircle, DarkSquare, LightSquare — 4 classes for 2 shapes × 2 colors. Add a new shape or color and the count explodes multiplicatively.
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