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Editor to share with you what is the use of java abstract classes and interfaces, I believe most people do not know much about it, so share this article for your reference, I hope you can learn a lot after reading this article, let's go to know it!

one。 Usage scenarios of the abstract class

Before you understand the abstraction, let's first take a look at the abstract method, written in the following format:

The access modifier abstract returns the value type method name ()

From the writing format, you can see that the method modified with abstract has no method body (that is, there is no method implementation, only the definition of the method), so you need to inherit other classes to implement this method.

Through the understanding of abstract methods, the abstract class is easy to understand. There are abstract methods and implementation methods in abstract classes. If you need to use abstract classes, you need subclasses to inherit this class.

According to the analysis, the usage scenarios are as follows:

1. To capture the general features of subclasses and improve the reusability of the code; 2. Reduce the development of repetitive functions and improve work efficiency

two。 Interface interface

An interface is a collection of abstract methods, and if a class implements an interface (note: a class can implement multiple interfaces, that is, multiple inheritance), then it inherits the abstract methods of this interface. This is like a contract pattern, and if you implement this interface, you must ensure that these methods are used. An interface is just a form, and the interface itself cannot do anything. Then the scene is clear:

1. Provide formal definitions and specifications; 2. When the interface is exposed to the outside, the caller does not need to care about the internal implementation and withdraws the characteristics of the encapsulation.

The difference between the abstract class and the interface interface is as follows

These are all the contents of the article "what are java Abstract classes and Interfaces for?" Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!

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