Page 145 - CTS - CSA TP - Volume 2

COMPUTER SOFTWARE APPLICATION - CITS

class Car extends Vehicle {
// Overriding the accelerate method of the superclass
@Override
void accelerate() {

System.out.println(“Car is accelerating”);
}
}
class Truck extends Vehicle {

// Overriding the accelerate method of the superclass
@Override
void accelerate() {
System.out.println(“Truck is accelerating”);
}
}

public class VehicleDemo {
public static void main(String[] args) {
Vehicle vehicle1 = new Car();
vehicle1.accelerate(); // Output: Car is accelerating

Vehicle vehicle2 = new Truck();
vehicle2.accelerate(); // Output: Truck is accelerating
}
}
Explanation:

• In this program, we have a superclass Vehicle and two subclasses Car and Truck.
• The Vehicle class has a method named accelerate() that prints “Vehicle is accelerating”.
• Both Car and Truck classes extend the Vehicle class and override the accelerate() method with their own
specific implementations.

• In the VehicleDemo class, we create instances of Car and Truck and assign them to references of type
Vehicle.
• When we call the accelerate() method on each object, the overridden version of the method is invoked
based on the actual object type, demonstrating polymorphism and method overriding.

TASK 4: Bank Account and its Subclasses

// Bank Account and its Subclasses using method overriding
class BankAccount {
double balance;
void deposit(double amount) {
balance += amount;

}
void withdraw(double amount) {

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CITS : IT & ITES - Computer Software Application - Exercise 99