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This article mainly explains "what are the advantages of the java open and closed principle". The content of the article is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "what are the advantages of the java open and closed principle".

Open and closed principle (OCP), The Open Closed Principle

Define

A software entity, including classes, methods, and modules, should be open to extensions and closed to modifications.

In other words, the entity of a software should modify the change through extension, rather than modify the source code of the existing entity.

The open and closed principle is also the most basic principle that needs to be followed. We should try our best to ensure the stability of the system. When we implement another function, we cannot modify the existing code so as not to cause the previous function to appear BUG and bring unnecessary trouble. So the open and closed principle is to guide us to design a stable and easy to expand system.

In practical application, we generally have the following methods to ensure the principle of openness and closure:

1. Abstract an interface or abstract class, define common methods, and achieve the purpose of extension.

2. Parameter types and reference types use interfaces or abstract classes, and cannot rely on implementation classes.

3. Interfaces and abstract classes cannot be modified, and can be extended in the form of inherited interfaces or abstract parent classes.

These applications do not look complex, but define interfaces and abstract classes reasonably, and different business functions are extended by different implementation classes, such as policy patterns and template mode patterns in design patterns are open and closed principles.

To sum up, the principle of opening and closing has the following advantages:

1. Easy to expand and improve maintainability.

2. It does not affect the existing functions, improves the stability of the system and reduces repeated tests.

3. The logic before expansion improves the reusability of the code.

Thank you for your reading, the above is the content of "what are the advantages of the java open and closed principle". After the study of this article, I believe you have a deeper understanding of the advantages of the java open and closed principle, and the specific use needs to be verified in practice. Here is, the editor will push for you more related knowledge points of the article, welcome to follow!

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