Polymorphism : MCQs & PYQs with Explanation

Option C

In Java, a method is a block of code that performs a specific task. One of the core features of Java is Polymorphism, which allows objects or methods to take multiple forms.
Method overloading is a type of compile-time polymorphism where a class has two or more methods with the same name but different parameter lists.

• The method name remains the same.
• The parameters must differ in type, number, or sequence (order).
• The return type of method does not play any role in method overloading.

It allows programmers to use the same method name for related actions, improving readability and organization.

class Calculator {
    int add(int a, int b) {
        return a + b;
    }
    int add(int a, int b, int c) {
        return a + b + c;
    }
    double add(double a, double b) {
        return a + b;
    }
}
public class Main {
    public static void main(String[] args) {
        Calculator calc = new Calculator();
        System.out.println(calc.add(15, 25));     
        System.out.println(calc.add(15, 12, 30));  
        System.out.println(calc.add(2.5, 7.5));
    }
}

Option A

The word Polymorphism means Many Forms. It allows objects or methods to take multiple forms, enabling flexibility and reusability in code. Polymorphism improves code flexibility, readability, and maintainability. There are two main types of polymorphism in Java:
Compile-Time Polymorphism (Method Overloading):

• A single method name can perform different tasks depending on the number or type of parameters.

Runtime Polymorphism (Method Overriding):

• A subclass can provide a specific implementation of a method already defined in its superclass. At runtime, the actual method that gets called depends on the object type.