画出结构型设计模式的类图

装饰器模式 Decorator

Attach additional responsibilities to an object dynamically.

Decorators provide a flexible alternative to subclassing for extending functionality.

适配器模式 Adapter

Convert the interface of a class into another interface clients expect.

Adapter lets classes work together that couldn't othwerwise because of incompatible interfaces. 

桥接模式 Bridge

Decouple an abstraction from its implementation so that the two can vary independently.

组合模式 Composite

Compose objects into tree structures to represent part-whole hierarchies.

Composite lets clients treat individual objects and compositions of objects uniformly.

代理模式 Proxy

Provide a surrogate or placeholder for another object to control access to it.

静态代理

JDK动态代理

享元模式 Flyweight

Use sharing to support large numbers of fine-gained objects efficiently.

外观模式 Facade

Provide a unified interface to a set of interfaces in a subsystem.

Facade defines a high-level interface that makes the subsystem easier to use.