Page 382 - Computer_Science_F5

Method overriding
Method overriding takes place when a subclass provides a different implementation
of a method that is already present in its parent class. It allows a subclass to customize
the behavior of inherited methods, as it is shown in Program Example 5.37. Chapter Five: Object oriented programming with Java
//This code try to overrideREADING ONLY
Program Example 5.37:

Java program to demonstrate method overriding

class MotorMachine {
public void startEngine() {
System.out.println(“MotorMachine starts”);
}
}
class Car extends MotorMachine {
// This code try to override
public void startEngine() {
System.out.println(“Car starts engine using a key”);
}
}
FOR ONLINE
class Motorcycle extends MotorMachine {

public void startEngine() {
System.out.println(“Motorcycle starts engine using a kick”);
}
}
public class Main {
public static void main(String[] args) {
MotorMachine machineA = new Car();
MotorMachine machineB = new Motorcycle();

machineA.startEngine(); // Output: Car starts engine using a key
machineB.startEngine(); // Motorcycle starts engine using a kick
}
}

In this particular illustration, there exists a parent class called MotorMachine that
possesses a method named StartEngine(). The Car and Motorcycle classes are
derived from the MotorMachine class, and they each provide their own versions of
the StartEngine() method by overriding it. When we invoke the StartEngine() method

373
Student’s Book Form Five

Computer Science Form 5.indd 373 23/07/2024 12:34