CognitiveClouds Node JS Developer Interview Questions and Answers

This interview question covers various topics including programming, design patterns, data structures, and exception handling in Java.

• Write a program to generate the Fibonacci series

• Write a program using boolean variables

• Explain the ClassCastException and how to handle it

• Discuss the Singleton design pattern and its implementation with different JDK versions

• Explain abstract classes and interfaces in your current project

• ...read more

I have used the Singleton design pattern in my Java projects.

• Singleton pattern ensures that only one instance of a class is created and provides a global point of access to it.

• It is useful when we want to limit the number of instances of a class to one.

• Example: Creating a Logger class as a Singleton to ensure only one instance is used throughout the application.