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design patterns, store login credentials, Creational design patterns,…

- - - - class
        
        use inheritance effectively
      - object
        
        use delegation effectively to get the job done.
        
        ???
  - - - 举例：注塑机
        
        取决于需要决定生产那种塑料玩具
    - - 举例：工作空间分配，采购，回收
    - - 举例：餐厅点餐-出餐
    - - 举例：细胞分裂
    - - Creates an instance of several families of classes
        
        举例：制造一辆汽车
  - - - Structural class-creation patterns use inheritance to compose interfaces.
      - Structural object-patterns define ways to compose objects to obtain new functionality.
  - - - 举例，计算算数表达式（树形））
    - - 举例，多功能客服（网络，电话）
    - - 举例：网页内图片加载
  - - - A way of passing a request between a chain of objects
    - - Encapsulate a command request as an object
    - - A way to include language elements in a program
    - - Sequentially access the elements of a collection
    - - Defines simplified communication between classes
    - - Capture and restore an object's internal state
    - - Designed to act as a default value of an object
    - - A way of notifying change to a number of classes
- - - - Link Title