Page 381 - Computer_Science_F5

Computer Science the superclass. Subclasses can redefine (override) inherited methods to offer their
unique implementations, facilitating polymorphic behavior.

Program Example 5.36:

FOR ONLINE READING ONLY
Java program to demonstrate polymorphism
class Animal {
public void makeSound() {
System.out.println(“Animal makes different sounds”);
}
}
class Lion extends Animal {
//This method override
public void makeSound() {
System.out.println(“ Lion roars”);
}
}
class Cat extends Animal {
//This method override
public void makeSound() {
System.out.println(“Cat meows”);
}
}
public class Main {
public static void main(String[] args) {
Animal myFirstAnimal = new Lion();
Animal mySecondAnimal = new Cat();

myFirstAnimal.makeSound(); // This method will print “Lion roars”
mySecondAnimal.makeSound(); // This method will print “Cat meows”
}
}

In Java, polymorphism is achieved through inheritance, method overriding, and
method overloading.

Activity 5.12:

Visualisation of polymorphism in Java
Use Jeliot 3 or later version, visualise the step by step execution of java program
to explore about polymorphism in Java. Use the code in Program Example 5.39.

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for Advanced Secondary Schools

Computer Science Form 5.indd 372 23/07/2024 12:34