设计模式之装饰者模式 Decorator Pattern
装饰者模式可以动态地给一个对象增加其他职责。
The Decorator Pattern attaches additional responsibilities to an object dynamically.
就扩展对象功能来说，装饰者模式比生成子类更为灵活。
Decorators provide a flexible alternative to subclassing for extending functionality.
装饰者模式动态地将职责附加到对象上。若要扩张功能，装饰者提供了比继承更有弹性的替代方案。
Attach additional responsibilities to an object dynamically keeping the same interface. Decorators provide a flexible alternative to subclassing for extending functionality.
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