Match the design pattern with its description A class that acts as a stand- in for another class. Allows you to enhance some functionality while delegating the main functionality to a (concrete) Subject. Provide the interface you want to provide for your client. Useful for hiding implementation details from your code base (e.g. if you're using a third-party library). 1. Null Object 2. Proxy 3. Decorator An object that will do nothing that is used in lieu of an uninstantiated value 4. Adapter to prevent errors in code. A way of enhancing other classes that implement the same interface. Adds functionality while delegating to an (abstract) Subject. >

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