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This article mainly explains "the principle of dependency inversion in Java design pattern". The content of the explanation is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "the principle of dependency inversion in Java design pattern".

Definition: high-level modules should not rely on lower-level modules, both should rely on their abstraction

Abstraction should not depend on details, details should rely on abstractions.

Programming for interfaces, not for implementation

Advantages: reduce the coupling between classes, improve system stability, improve code readability and maintainability, and reduce the risk of modifying program locks

Core idea: interface-oriented programming

Class diagram:

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