Summary of seven design principles

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principle

• Principle of single responsibility   A class is only responsible for the corresponding responsibilities in a functional area .

• The principle of Dependence Inversion

• High-level modules should not rely on low-level modules , Both should rely on abstraction

• Abstractions should not depend on details , Details should depend on abstraction .

• In other words , Be interface oriented （ abstract class ） Programming , Not implementation oriented programming . Opening and closing principle   A software entity should be open to extension , Turn off for changes . That is to say, the software entity should be extended without modifying the original code .

• Interface isolation principle   Using multiple specialized interfaces , Instead of using a single master interface .

• Richter's principle of substitution   Where all base classes appear, they must be replaced by subclasses , And the function will not be affected .

• Synthetic multiplexing principle   Try to use object combinations / polymerization , Instead of inheritance to achieve reuse .

• The Demeter principle   Also known as the minimum knowledge principle , A software entity should interact with as few other entities as possible . The coupling between classes should be as low as possible , So if the class changes , The impact will be minimal . Communicate only with direct friends , Don't talk to strangers .

The principle of opening and closing is the goal , The Richter principle is the basis , Relying on the principle of inversion is the means .

The core idea

• Isolate change

• Programming to an interface , Instead of programming for implementation

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