class Vehicle {
    String brand;
    int year;
    void start() {
        System.out.println("Starting the vehicle.");
    }
}
class Car extends Vehicle {
    int numberOfDoors;
    void openTrunk() {
        System.out.println("Opening the trunk.");
    }
}
    

Extending a Class

To create a derived class, use the extends keyword followed by the name of the base class. The derived
class inherits all the non-private attributes and methods of the base class.

class Car extends Vehicle {
    int numberOfDoors;
    void openTrunk() {
        System.out.println("Opening the trunk.");
    }
}
    

Accessing Inherited Members

Inherited members (attributes and methods) can be accessed directly from an object of the derived class.

Car myCar = new Car();
myCar.brand = "Toyota"; // Accessing an inherited attribute
myCar.start(); // Accessing an inherited method
    

Method Overriding

A derived class can provide its own implementation of a method that it inherits from the base class. This is known
as method overriding.

class Car extends Vehicle {
    int numberOfDoors;
    @Override
    void start() {
        System.out.println("Starting the car's engine.");
    }
}
    

Conclusion

Inheritance is a powerful concept in Java that allows you to build complex class hierarchies and promote code reuse.
You've learned about base classes, derived classes, method overriding, and how to extend classes in this guide. As
you continue to develop Java applications, inheritance will be a key tool for structuring and organizing your code.