What is class inheritance in java

The inheritance of classes in Java is achieved by extending other classes to form new classes. The original class is called the parent class (super class) or base class, and the new class is called the original class. A subclass or derived class of a class. In a subclass, it not only contains the attributes and methods of the parent class, but also adds new attributes and methods, so that the basic characteristics of the parent class can be shared by all objects of the subclass.

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Note: Class inheritance does not change the access rights of class members. That is to say, if the members of the parent class are public, protected, or default, its subclasses still have these corresponding characteristics.

The definition format of class inheritance is as follows:

class class_name extends extend_class
{
    //类的主体
}

Among them, class_name represents the name of the subclass (derived class); extend_class represents the name of the parent class (base class); the extends keyword directly follows After the subclass name, it is followed by the name of the parent class to which the class inherits. For example:

public class Student extends Person{}

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