GOF Design Pattern Learning Summary

What is design mode

A solution provided to solve a class of pervasive problems;

Classification and definition

Create-mode (5)

1, prototype mode: By copying an existing object to generate a new object, the copied object is called the prototype;

2, Singleton mode: A class has only one global instance; Details ...

3. Generator Mode: Abstract the creation process of complex objects, the same creation steps, different creation process implementations, and the generation of objects of various representations;

4, factory method mode: The specific factory object is responsible for the production of specific product objects;

5, Abstract Factory mode: is a group of factories with the same theme to be encapsulated; Details ...

Simple Factory mode: A factory method, according to the parameters, to generate the corresponding specific product objects; //Do not belong to gof-23 details ...

Structural mode (7)

1, Decoration mode: Through the association mechanism to increase the behavior of the class, the expansion of its behavior by modifying the object to decide;

2, enjoy meta mode: A large number of fine-grained object sharing reuse;

3, Bridging mode: The behavior of the object is abstracted as an interface, as a member of the abstract class properties in the abstract layer of composition; Details ...

4, the combination mode: The realization of the tree structure, used to describe the "whole-part" relationship; Details ...

5. Appearance mode: Define a higher level interface on the interface of subsystem, convenient to use the interface in subsystem;

6, Proxy mode: Indirectly control and access the target object through the proxy object method;

7, Adapter mode: Adapter is to transform an interface into another interface of a wrapper class;

Behavioral Mode (11)

1, Interpreter mode: Define some grammar rules, then define a parser to parse the syntax;

2, the visitor mode: without modifying the existing program structure, by adding additional "visitors" to complete the existing code features to improve, details ...

3. Memo mode: Saves a state of an object and can revert to that State; Details ...

4, Intermediary mode: Objects through the intermediary object interaction, rather than direct interaction;

5, Template Method mode: Using the Java inheritance mechanism, define a template method in the abstract class, the method refers to several abstract methods (subclass implementation) or specific methods;

6, Responsibility Chain mode: Create a chain of recipient objects for the request, each recipient contains a reference to another recipient, and when a recipient cannot process the request, the request is forwarded to the next recipient;

7, Command mode: The request is encapsulated into a command object, the specific execution of the request is executed by the command receiver;

8. State mode: The behavior of an object changes automatically according to the change of its internal state; Details ...

9, Strategy mode: The behavior of the object, in different circumstances, there are different implementations;

10. Iterator mode: Provides a way to access individual elements of a container object without exposing the object's internal details. Details...

11, Observer mode: a one-to-many relationship, also known as the publish-subscribe mode, that is, the state of an object changes, all dependent on its object can know the change and automatically update;

Related design principles involved

• Single principle of responsibility
• The principle of the Richter replacement
• Dependency Inversion principle
• Interface Isolation principle
• Dimitri Law
• Opening and closing principle

Use frequency sorting

Create-mode (5)

Factory method Mode: ★★★★★

Abstract Factory mode: ★★★★★

Single-case mode: ★★★★☆

Simple Factory mode: ★★★★☆ //Does not belong to gof-23

Prototype mode: ★ ★☆

Generator mode:★☆

Structural mode (7)

Appearance mode: ★★★★★

Proxy mode: ★★★★☆

Combination mode: ★★★★☆

Adapter Mode: ★★★★☆

bridging mode: ★★★☆☆

Decorative mode: ★ ★☆

Enjoy meta mode:★< Span style= "color: #000000;" >< Span style= "color: #000000;" >☆☆

Behavioral Mode (11)

Iterator mode: ★★★★★

Viewer mode: ★★★★★

Command mode: ★★★★☆

Policy mode: ★★★★☆

Template method Mode: ★★★☆☆

Responsibility Chain mode: ★ ★★< Span style= "color: #000000;" >☆☆

State mode: ★ ★★< Span style= "color: #000000;" >☆☆

Memo mode: < Span style= "color: #000000;" >☆☆☆

Intermediary mode:★☆

Interpreter mode:★☆☆★

Visitor mode:★☆☆★

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Gof Design Pattern Learning Summary