Practice Object Oriented Programming Questions and Answers

• In OOP, a blueprint for creating objects (a particular data structure), providing initial values for state (member variables or attributes), and implementa...
• An "object" is an instance of a:
• What is a "method" in the context of OOP?
• Which special method is automatically called when an object of a class is created, typically used for initializing the object's state?
• Which access modifier restricts access to a class member only within the class itself and its derived classes?
• The bundling of data (attributes) and methods (functions) that operate on the data into a single unit (class), and restricting direct access to some of the...
• How is data hiding primarily achieved in OOP?
• What is a key benefit of encapsulation?
• The concept of showing only essential features of an object and hiding the complex implementation details is called:
• Which of the following is a common way to achieve abstraction in OOP?
• An abstract class:
• What is the main purpose of an interface in OOP?
• The ability of an object to take on many forms, or the ability of a single interface to represent different underlying forms, is known as:
• Which type of polymorphism is achieved through method overloading (where multiple methods have the same name but different parameters)?
• Which OOP concept allows a class to inherit properties and behaviors from another class?
• The ability of an object to take on many forms is known as:
• Which OOP principle binds data and the methods that operate on that data within a single unit?
• What is the primary goal of Abstraction in OOP?
• Which of the following is a common mechanism to achieve abstraction in OOP?
• An abstract class in Java/C++:
• What is an interface in OOP (e.g., Java, C#)?
• Which statement about abstract methods is true?
• How does abstraction contribute to code maintainability?
• Which of the following best represents a real-world example of abstraction?
• What is the primary difference between an abstract class and an interface in Java (pre-Java 8)?
• If a class contains an abstract method, what must be true about the class itself?
• Which OOP principle is most closely related to the concept of "information hiding"?
• What is Encapsulation in OOP?
• Which access modifier is most commonly used to achieve data hiding in encapsulation?
• What are "getter" and "setter" methods primarily used for in the context of encapsulation?
• Which of the following is a benefit of encapsulation?
• Consider a BankAccount class with a balance field. To properly encapsulate balance, it should be declared as: