Method overriding in Java - Mini Project: Build & Apply

Method overriding

📖 Scenario: Imagine you are creating a simple program to show different types of vehicles and how they make sounds. Each vehicle has a basic sound, but some vehicles make special sounds. We will use method overriding to show this difference.

🎯 Goal: You will build a Java program with a base class Vehicle that has a method makeSound(). Then you will create a subclass Car that overrides the makeSound() method to show a different sound. Finally, you will print the sounds from both classes.

📋 What You'll Learn

Create a class called Vehicle with a method makeSound() that prints "Vehicle sound".

Create a subclass called Car that extends Vehicle.

Override the makeSound() method in Car to print "Car sound".

Create objects of both Vehicle and Car and call their makeSound() methods.

Print the output of both method calls.

💡 Why This Matters

🌍 Real World

Method overriding is used when different types of objects share the same method name but need to behave differently, like different vehicles making different sounds.

💼 Career

Understanding method overriding is essential for object-oriented programming, which is widely used in software development jobs to create flexible and reusable code.

1

Create the base class Vehicle

Create a class called Vehicle with a method makeSound() that prints exactly "Vehicle sound".

Java

// Your code here

Need a hint?

Define a class named Vehicle. Inside it, write a method makeSound() that prints "Vehicle sound" using System.out.println.

2

Create the subclass Car

Create a class called Car that extends Vehicle. Do not add any methods yet.

Java

class Vehicle {
    void makeSound() {
        System.out.println("Vehicle sound");
    }
}

// Your code here

Need a hint?

Write a new class named Car that uses extends Vehicle to inherit from the Vehicle class.

3

Override the makeSound() method in Car

Inside the Car class, override the makeSound() method to print exactly "Car sound".

Java

class Vehicle {
    void makeSound() {
        System.out.println("Vehicle sound");
    }
}

class Car extends Vehicle {
    // Your code here
}

Need a hint?

Inside the Car class, write a method makeSound() with the @Override annotation that prints "Car sound".

4

Create objects and print sounds

Create an object called vehicle of class Vehicle and an object called car of class Car. Call makeSound() on both objects and print their outputs.

Java

class Vehicle {
    void makeSound() {
        System.out.println("Vehicle sound");
    }
}

class Car extends Vehicle {
    @Override
    void makeSound() {
        System.out.println("Car sound");
    }
}

// Your code here

Need a hint?

Create objects using new keyword and call makeSound() on each. The output should show "Vehicle sound" first, then "Car sound".