Callisto IT Solutions Junior Java Developer Interview Questions and Answers

OOPs concept is a programming paradigm based on the concept of objects, which can contain data in the form of fields and code in the form of procedures.

• Encapsulation: bundling data and methods that operate on the data into a single unit. Example: a car object with properties like color and methods like start() and stop().

• Inheritance: allows a class to inherit properties and behavior from another class. Example: a class...read more

A real life scenario example of OOPs is modeling a car as an object with properties and methods.

• Create a Car class with attributes like make, model, year, color

• Define methods like start(), accelerate(), brake()

• Instantiate multiple car objects and perform actions on them

Collections in Java are classes and interfaces that provide a way to store and manipulate groups of objects.

• Collections provide a way to work with groups of objects in Java

• They include classes like ArrayList, LinkedList, HashMap, etc.

• Collections framework provides interfaces like List, Set, Map, etc.

• Collections offer methods for adding, removing, and accessing elements in a group

I am a passionate Java developer with 5 years of experience in developing web applications and implementing software solutions.

• 5 years of experience in Java development

• Strong knowledge of web application development

• Experience in implementing software solutions

• Passionate about coding and problem-solving

Developed a web application for online shopping with user authentication and payment gateway integration.

• Used Java Spring framework for backend development

• Implemented RESTful APIs for communication between frontend and backend

• Integrated Stripe API for secure payment processing