图4显示了装饰器模式的类图。

Figure 4 shows a class diagram for the decorator pattern.

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装饰器模式的优点是可以轻松地同时跟踪库的多个装饰器。

An advantage of the decorator pattern is that you can easily tack on more than one decorator to the base at a time.

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装饰器模式动态地将责任附加到对象上。若要扩展功能，装饰者提供了比继承更有弹性的替代方案。

Decorator Pattern Attaches additional responsibilities to an object dynamically. Decorators provide a flexible alternative to sub classing for extending functionality.

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