设计模式 Design Patterns
前言：刚学会使用
Typora写Markdown，记录一下自己收藏关于设计模式文章。
创建型 Creational patterns
Abstract Factory
Creates an instance of several families of classes
Builder
Separates object construction from its representation
Factory Method
Creates an instance of several derived classes
Object Pool
Avoid expensive acquisition and release of resources by recycling objects that are no longer in use
Prototype
A fully initialized instance to be copied or cloned
Singleton
A class of which only a single instance can exist
结构型 Structural patterns
Adapter
Match interfaces of different classes
Bridge
Separates an object’s interface from its implementation
Composite
A tree structure of simple and composite objects
Decorator
Add responsibilities to objects dynamically
Facade
A single class that represents an entire subsystem
Flyweight
A fine-grained instance used for efficient sharing
Private Class Data
Restricts accessor/mutator access
Proxy
An object representing another object
行为型 Behavioral patterns
Chain of responsibility
A way of passing a request between a chain of objects
Command
Encapsulate a command request as an object
Interpreter
A way to include language elements in a program
Iterator
Sequentially access the elements of a collection
Mediator
Defines simplified communication between classes
Memento
Capture and restore an object’s internal state
Null Object
Designed to act as a default value of an object
Observer
A way of notifying change to a number of classes
State
Alter an object’s behavior when its state changes
Strategy
Encapsulates an algorithm inside a class
Template method
Defer the exact steps of an algorithm to a subclass
Visitor
Defines a new operation to a class without change