What keywords are used to indicate that a class inherits another class in Java?

The keyword of Java class inheritance is extends, which allows a subclass to inherit the properties and methods of the parent class to achieve code reuse, code organization and polymorphism.

Keywords used in Java class inheritance

In Java, it indicates that one class inherits the key of another class The words are extends.

The meaning of inheritance

Inheritance is an important mechanism in object-oriented programming, which allows one class (subclass) to inherit from another class (parent class) Properties and methods. Subclasses can override the methods of the parent class and add their own new methods and properties.

Usage of the extends keyword

To indicate that a class inherits another class, you need to use the extends keyword in the class declaration of the subclass, followed by the name of the parent class . For example:

<code class="java">public class ChildClass extends ParentClass {
    // 子类的代码...
}</code>

In this example, ChildClass inherits all properties and methods from ParentClass.

Advantages of inheritance

The main advantages of inheritance include:

• Code reuse: Subclasses can reuse the code of the parent class without duplication Write the same function.
• Code Organization: Inheritance helps organize code hierarchically, making it easier to understand and maintain.
• Polymorphism: Inheritance supports polymorphism, which allows objects to exhibit different behaviors depending on their type.

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