Shulou(Shulou.com)05/31 Report--

This article focuses on "what are the design principles of the java development framework", interested friends may wish to take a look. The method introduced in this paper is simple, fast and practical. Now let the editor take you to learn "what are the design principles of the java development framework?"

A brief introduction to the concept of Framework Development

Object-oriented analysis: object-oriented analysis is the object analysis of the objective world programming business domain, and there are some concepts that should be understood in the process; hyperemia model: data and corresponding business logic are encapsulated into the same class; anemia model: data and business logic are divided into different classes; DDD: domain-driven model, MVC traditional three-tier architecture

Object-oriented design purpose: strong cohesion, low coupling; easy to expand; stability; extensible, simple

Object-oriented design principle: the principle is independent of programming languages, and even non-object-oriented programming languages can be used.

Design pattern: a general solution mainly used to solve a certain kind of problem, which is equivalent to mathematical formula and nested development. generally, we summarize the design pattern as creative pattern, behavior model and structural pattern.

Framework: a framework is a structural program that implements a certain kind of application, and it is a reusable design and implementation of a certain kind of architecture scheme.

Design principles of the development framework SOLID principles

SRP: Single Responsibility Principle, a class or module is responsible for only one responsibility

OCP:Open Closed Principle, software entities (modules, classes, methods, etc.) should be "developed for extension, closed for modification"

LSP:Liskov Substitution Principle, child objects can replace wherever the parent objects appear in the program, and ensure that the logical behavior of the original program remains unchanged and its correctness will not be broken.

ISP: Interface Segregation Principle, the client should not be forced to rely on interfaces it does not need

DIP:Dependency Inversion Principle, high-level modules should not rely on low-level modules, high-level modules and low-level modules should rely on each other through abstraction, in addition, abstraction does not rely on specific implementation details, specific implementation details rely on abstraction.

KISS principle

KISS=Keep It Short and Simple. (try to keep it simple. )

Do not implement the code using techniques that your colleagues may not understand. For example, the regular expressions in the previous examples, and the syntax in some programming languages that are too advanced.

Don't make wheels over and over again, be good at using existing tool libraries. Experience has proved that if you implement these class libraries by yourself, the probability of bug will be higher, and the cost of maintenance will be higher.

Don't over-optimize. Don't overuse some tricks (for example, bit operations instead of arithmetic operations, complex conditional statements instead of if-else, using some too low-level functions, etc.) to optimize the code at the expense of its readability.

YAGNI principle

KISS=You Ain't Gonna Need It. (don't overdesign. )

The original intention of the design is to improve the code quality.

The process of design is that there are problems before there is a solution.

The application scenario designed is complex code.

Continuous refactoring can effectively avoid over-design

Don't talk about design apart from the specific scene.

DRY principle

DRY=Don't Repeat Yourself. (don't write duplicate code. )

Reduce code coupling

Meet the principle of single responsibility

Modularization

Separation of business and non-business logic

Universal code sinking

Inheritance, polymorphism, abstraction, encapsulation

Design patterns such as application templates

At this point, I believe you have a deeper understanding of "what are the design principles of the java development framework". You might as well do it in practice. Here is the website, more related content can enter the relevant channels to inquire, follow us, continue to learn!

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.