AMCAT OOP Concepts 2

Question 1

Which OOP principle allows a class to have multiple methods with the same name but different parameters?

Accepted Answer

Method Overloading

Answer

Method overloading is compile-time polymorphism where multiple methods share the same name but differ in parameter list.

Question 2

In Java, when you call an overridden method through a base-class reference, which method is executed?

Accepted Answer

Derived class method

Answer

Java uses dynamic dispatch — the actual object type determines which method runs at runtime.

Question 3

Which access modifier makes a class member accessible only within the same class?

Accepted Answer

private

Answer

private restricts access to within the declaring class only.

Question 4

In Java, what is the purpose of the 'super' keyword?

Accepted Answer

To call the parent class constructor or method

Answer

'super' refers to the immediate parent class. It calls the parent's constructor (super()) or accesses the parent's method (super.method()).

Question 5

What is an abstract class?

Accepted Answer

A class that cannot be instantiated and may have abstract methods

Answer

An abstract class cannot be instantiated. It may have abstract methods (no body) that subclasses must implement.

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