What are the three characteristics of Java object-oriented

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Object-oriented has three characteristics: encapsulation, inheritance and polymorphism.

L encapsulation: hides the properties and implementation details of the object, and only provides public access, which isolates specific changes, is easy to use, and improves reusability and security.

L inheritance: there is a certain ownership relationship between two things, so the inherited class can obtain some properties and methods from the inherited class; this improves the reusability of the code. Inheritance is a prerequisite for polymorphism.

L polymorphism: the reference of the parent class or interface points to the subclass object, which improves the extensibility of the program, that is, as long as you implement or inherit the same interface or class, you can use the corresponding methods in the parent class to improve the extensibility of the program. But the downside of polymorphism is that the parent class reference cannot access the members of the subclass.

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