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This article mainly explains "what are the characteristics of java object-oriented". 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 "what are the characteristics of java object-oriented"?

What is object-oriented?

Object-oriented programming is not only a kind of programming model with object concept, but also an abstract policy of program development. It may contain data, properties, code, and methods. An object refers to an instance of a class. It takes the object as the basic unit of the program and encapsulates the program and data in order to improve the reusability, flexibility and expansibility of the software. the program in the object can access and often modify the data related to the object. In object-oriented programming, computer programs are designed to be related to each other. The advantages of object-oriented are easy to maintain, easy to reuse and easy to expand. Because the object-oriented has the characteristics of encapsulation, inheritance and polymorphism, a low-coupling system can be designed to make the system more flexible and easier to maintain. But its disadvantages are also obvious, such as lower performance than process-oriented.

What are the characteristics of object-oriented?

1. Encapsulation: find the change and encapsulate it, and you can modify or expand the encapsulated change without affecting other parts, which is the basis of all design patterns, that is, encapsulating the change, so the function of encapsulation solves the extensibility of the program.

2. Inheritance: the subclass inherits the parent class, inherits the methods and properties of the parent class, and realizes the reuse of polymorphism and code, so it also solves the reuse and expansibility of the system, but inheritance destroys the encapsulation. Because it is open to subclasses, modifying the parent class will lead to changes in all subclasses, so inheritance destroys the scalability of the system to a certain extent, so inheritance needs to be used carefully. Only explicit IS-A relationships can be used, while inheriting what is reconstructed in the process of program development, rather than using inheritance at the beginning of program design, many object-oriented developers abuse inheritance, resulting in later code can not solve the changes in requirements. So giving priority to composition over inheritance is an important experience in object-oriented development.

3. Polymorphism: many different ways to implement an interface are polymorphisms. Interface is the abstraction of behavior, just mentioned in the encapsulation, find the change part and encapsulate it, but after encapsulation, how to adapt to the next change? This is what interfaces are for, and the main purpose of interfaces is to provide general processing services for unrelated classes, as we can imagine. For example, birds can fly, but Superman can also fly. Through this interface, we can make both birds and Superman realize this interface, which realizes the maintainability and expansibility of the system.

Thank you for reading, the above is the content of "what are the characteristics of java object-oriented". After the study of this article, I believe you have a deeper understanding of the characteristics of java object-oriented, 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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