What is the keyword inheritance in java

The extends keyword is used in Java to indicate an inheritance relationship. Through the extends keyword, a subclass can inherit the non-private members of the parent class and establish an is-a relationship in which the subclass is a subtype of the parent class, thereby achieving code reuse. , scalability and polymorphism.

Inherited keywords in Java

extends keywords are used in Java to represent inheritance relationship.

Detailed explanation:

In Java, a class can inherit properties and methods from another class through the extends keyword. Through inheritance, subclasses can access and use non-private members defined in the parent class. Inheritance establishes a is-a relationship, which means that the child class is a subtype or a specialization of the parent class.

Usage:

class ChildClass extends ParentClass {
    // 子类代码
}

In this example, ChildClass inherits from ParentClass. This means that ChildClass can access and use all non-private members defined in ParentClass.

Benefits of inheritance:

• Code reuse: Inheritance allows public and protected members to be inherited from parent classes, reducing code duplication.
• Extensibility: Through inheritance, existing classes can be easily extended without modifying the parent class.
• Polymorphism: Inheritance helps achieve polymorphism, allowing subclass objects to be treated as references to parent class objects.

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