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

Encapsulation

Answer

Inheritance

Answer

Abstraction

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

Base class method

Answer

Compilation error occurs

Answer

Runtime error occurs

Question 3

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

Accepted Answer

private

Answer

public

Answer

protected

Answer

default

Question 4

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

Accepted Answer

To call the parent class constructor or method

Answer

To create a new object

Answer

To declare an abstract method

Answer

To implement an interface

Question 5

What is an abstract class?

Accepted Answer

A class that cannot be instantiated and may have abstract methods

Answer

A class with no methods

Answer

A class with only static methods

Answer

A class that implements all interface methods

Question 6

What is the key difference between an interface and an abstract class in Java?

Accepted Answer

A class can implement multiple interfaces but extend only one abstract class

Answer

Interfaces can have constructors

Answer

Abstract classes cannot have concrete methods

Answer

Interfaces can have instance variables