【23种设计模式之】9.Facade外观模式——简述（类似于装饰器模式、对象适配器）

练习源码：https://github.com/liaoooyx/Design-Patterns

核心思想依然是组合。

类似于装饰器模式、适配器模式中的对象适配器。

通过一个门面类（Facade），以成员变量的方式持有其他多个类（组合），这些具有相同的方法，但提供不同的功能。用户通过这个门面类进操作。

参考：java设计模式之外观模式（门面模式）

参考：http://jargon.js.org/_glossary/FACADE_PATTERN.md
The Facade Pattern (or façade pattern) is a software design pattern commonly used with object-oriented programming. The name is by analogy to an architectural facade.

A facade is an object that provides a simplified interface to a larger body of code, such as a class library. A facade can:

• make a software library easier to use, understand and test, since the facade has convenient methods for common tasks;
• make the library more readable, for the same reason;
• reduce dependencies of outside code on the inner workings of a library, since most code uses the facade, thus allowing more flexibility in developing the system;
• wrap a poorly designed collection of APIs with a single well-designed API.

The Facade design pattern is often used when a system is very complex or difficult to understand because the system has a large number of interdependent classes or its source code is unavailable. This pattern hides the complexities of the larger system and provides a simpler interface to the client. It typically involves a single wrapper class which contains a set of members required by client. These members access the system on behalf of the facade client and hide the implementation details.

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