What is java a programming language for?

Java language is an object-oriented programming language. Object-oriented is a method of understanding and abstracting the real world. It is the product of the development of computer programming technology to a certain stage. The object-oriented development model is more conducive to people's thinking, and facilitates the division of programs during the specific development process. Division of labor and cooperation among employees to improve development efficiency.

Java language is an object-oriented programming language

Object-oriented is an understanding of the real world And abstract methods are the product of computer programming technology developing to a certain stage.

The object-oriented development model is more conducive to people's thinking. It facilitates the division of programs during the specific development process, facilitates programmers' division of labor and cooperation, and improves development efficiency. Object-oriented programming has the following advantages. Reusability: code reuse, reducing the amount of code and improving development efficiency. The three core features of object-oriented (inheritance, encapsulation and polymorphism) introduced below all revolve around this core. Scalability: Refers to the fact that new functions can be easily added to the system to facilitate software modification. Manageability: Ability to combine functions with data to facilitate management.

Features:

(1) Object uniqueness.

Each object has its own unique identifier, through which the corresponding object can be found. During the entire lifetime of an object, its identity does not change, and different objects cannot have the same identity.

(2) Abstraction.

Abstraction refers to abstracting objects with consistent data structures (properties) and behaviors (operations) into classes. A class is an abstraction that reflects important properties related to an application while ignoring other irrelevant content. The division of any class is subjective, but must be related to the specific application.

(3) Inheritance.

Inheritance is a mechanism for subclasses to automatically share parent class data structures and methods. This is a relationship between classes. When defining and implementing a class, you can do it on the basis of an existing class, take the content defined by the existing class as your own content, and add some new content.

Inheritance is the most important feature that distinguishes object-oriented programming languages ​​from other languages ​​and is not found in other languages.

In the class hierarchy, a subclass only inherits the data structure and methods of a parent class, which is called single inheritance.

In the class hierarchy, when a subclass inherits the data structures and methods of multiple parent classes, it is called multiple inheritance.

Multiple inheritance, JAVA, VB, NET, and Objective-C only support single inheritance. Note that when using multiple inheritance in C, you need to be careful about ambiguity.

In software development, the inheritance of classes makes the software created open and extensible. This is an effective method of organizing and classifying information. It simplifies the creation of objects and classes. volume, increasing code reusability.

Uses inheritance to provide a standardized hierarchical structure of classes. Through the inheritance relationship of classes, public features can be shared, improving the reusability of software.

(4) Polymorphism (polymorphism)

Polymorphism means that the same operation, function, or process can act on multiple types of objects and obtain different results. Different objects can produce different results when receiving the same message. This phenomenon is called polymorphism.

Polymorphism allows each object to respond to common messages in a way that suits itself.

Polymorphism enhances software flexibility and reusability.

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