Page 143 - CTS - CSA TP - Volume 2

COMPUTER SOFTWARE APPLICATION - CITS

public class ShapeDemo {
public static void main(String[] args) {

Shape shape1 = new Circle();
shape1.draw(); // Output: Drawing a circle
Shape shape2 = new Rectangle();
shape2.draw(); // Output: Drawing a rectangle

}
}
Output:

Explanation:
• In this program, we have a superclass Shape and two subclasses Circle and Rectangle.
• The Shape class has a method named draw() that prints “Drawing a shape”.

• Both Circle and Rectangle classes extend the Shape class and override the draw() method with their own
specific implementations.
• In the ShapeDemo class, we create instances of Circle and Rectangle and assign them to references of
type Shape.
• When we call the draw() method on each object, the overridden version of the method is invoked based on
the actual object type, demonstrating dynamic dispatch.
• Method overriding allows us to provide specialized implementations of methods in subclasses, promoting
code reusability and polymorphic behavior.

TASK 2: Animal and its Subclasses
// Method overriding
class Animal {
void sound() {
System.out.println(“Animal makes a sound”);

}
}
class Dog extends Animal {
// Overriding the sound method of the superclass

@Override
void sound() {
System.out.println(“Dog barks”);
}
}

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