Write a Java program to create a class Vehicle with a method called speedUp().Create two subclasses Car and Bicycle. Override the speedUp
()method in each subclass to increase the vehicle's speed differently.

Question

Write a Java program to create a class Vehicle with a method called speedUp().Create two subclasses Car and Bicycle. Override the speedUp
()method in each subclass to increase the vehicle's speed differently.

Accepted Answer

```java // Define the base class Vehicle class Vehicle { // speed attribute to hold the vehicle's speed protected int speed; // Constructor to set the initial speed public Vehicle() { this.speed = 0; } // Method to be overridden by subclasses public void speedUp() { // This method will be overridden in subclasses } // Method to get the current speed of the vehicle public int getSpeed() { return speed; } } // Define the subclass Car that extends Vehicle class Car extends Vehicle { // Override the speedUp method for Car @Override public void speedUp() { // Increase the car's speed by 10 speed += 10; } } // Define the subclass Bicycle that extends Vehicle class Bicycle extends Vehicle { // Override the speedUp method for Bicycle @Override public void speedUp() { // Increase the bicycle's speed by 3 speed += 3; } } ``` ```java // Main class to test the Vehicle, Car, and Bicycle classes public class Main { public static void main(String[] args) { // Create an instance of Car Car car = new Car(); // Speed up the car car.speedUp(); // Assert that the car's speed has increased by 10 assert car.getSpeed() == 10 : "Car did not speed up correctly"; // Create an instance of Bicycle Bicycle bicycle = new Bicycle(); // Speed up the bicycle bicycle.speedUp(); // Assert that the bicycle's speed has increased by 3 assert bicycle.getSpeed() == 3 : "Bicycle did not speed up correctly"; } } ``` ∻Explanation∻ ⚹The provided Java program defines a base class Vehicle with a method called speedUp(). Two subclasses, Car and Bicycle, are created, each overriding the speedUp() method to increase the vehicle's speed by different amounts. The Car class increases the speed by 10, while the Bicycle class increases it by 3. The main class tests the functionality of the speedUp() method for both subclasses.⚹ ∻Step-by-step Instruction∻ ‖ ▪ ⋮ Define the base class Vehicle with a protected speed attribute and a speedUp() method. ‖ ‖ ▪ ⋮ Implement the Car subclass that extends Vehicle and overrides the speedUp() method to increase speed by 10. ‖ ‖ ▪ ⋮ Implement the Bicycle subclass that extends Vehicle and overrides the speedUp() method to increase speed by 3. ‖ ‖ ▪ ⋮ Define the main class with a main method to test the functionality of the Car and Bicycle classes. ‖ ∻Time Complexity∻ ⚹The time complexity for the speedUp() method in both Car and Bicycle classes is O(1) because the operations inside the method execute in constant time.⚹ ∻Space Complexity∻ ⚹The space complexity for the program is O(1) as well, since the amount of memory used does not depend on the size of the input and only a fixed number of vehicle objects are created.⚹

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