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Does the Bridge Pattern decouples an abstraction from implementation?

BridgePattern decouples an abstraction from its implementation. Abstraction and Implementation can vary independently since the concrete class does not directly implement Abstraction ( interface) Implementation never refers Abstraction. Abstraction contains Implementation interface as a member (through composition). Coming back to your question regarding the example code in [journaldev][4] article : Shape is Abstraction Triangle is … Read more

Difference between Bridge pattern and Adapter pattern

“Adapter makes things work after they’re designed; Bridge makes them work before they are. [GoF, p219]” Effectively, the Adapter pattern is useful when you have existing code, be it third party, or in-house, but out of your control, or otherwise not changeable to quite meet the interface you need it to. For instance, we have … Read more

When to use the Bridge pattern and how is it different from the Adapter pattern?

There’s a combination of Federico’s and John’s answers. When: —-Shape— / \ Rectangle Circle / \ / \ BlueRectangle RedRectangle BlueCircle RedCircle Refactor to: —-Shape— Color / \ / \ Rectangle(Color) Circle(Color) Blue Red

How do the Proxy, Decorator, Adapter, and Bridge Patterns differ?

Proxy, Decorator, Adapter, and Bridge are all variations on “wrapping” a class. But their uses are different. Proxy could be used when you want to lazy-instantiate an object, or hide the fact that you’re calling a remote service, or control access to the object. Decorator is also called “Smart Proxy.” This is used when you … Read more