Question 1

What is abstraction in Java?

Accepted Answer

Abstraction in Java involves simplifying complex systems by modeling classes based on the essential features they provide while hiding unnecessary details. Abstract classes and interfaces are used to achieve abstraction.

Question 2

How are interfaces used in Java OOP?

Accepted Answer

Interfaces in Java define a contract for classes that implement them. They contain abstract methods that the implementing classes must implement. Interfaces provide a way to achieve multiple inheritance and are used to define common behaviors for unrelated classes.

Question 3

How does Java support multiple inheritances?

Accepted Answer

Java supports multiple inheritance through interfaces. A class can implement multiple interfaces, allowing it to inherit method signatures from multiple sources. However, Java only supports one class inheritance to avoid the diamond problem.

Question 4

What is the significance of the 'super' keyword in Java OOP?

Accepted Answer

The 'super' keyword in Java refers to the immediate parent class's object or members. It is often used to invoke the parent class's methods, access fields, or call the parent class's constructor.

Question 5

Explain Inheritance in Java OOP.

Accepted Answer

Inheritance is a mechanism in Java that allows a class (subclass or derived class) to inherit properties and behaviors of another class (superclass or base class). It promotes code reusability and establishes a relationship between classes.

oops concepts in java with examples

OOPs Concepts in Java with Examples & Interview Questions

OOPS Concepts in Java: What It Is, Why Is it Called That, Advantages, and More