Capgemini Walk-in Drive For Software Developer

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🔹 Core Java Interview Questions & Answers :

Q1: What is the difference between == and .equals() in Java?
A:

• == compares object references (memory locations).

• .equals() compares the actual content of the objects (usually overridden in String and wrapper classes).

Q2: What are the features of Java 8?
A:

• Lambda expressions

• Stream API

• Functional interfaces

• Optional class

• Default and static methods in interfaces

• Date and Time API (java.time)

Q3: What is Polymorphism in Java?
A:
Polymorphism means the ability to take many forms. In Java, it’s implemented via method overloading (compile-time) and method overriding (runtime).

🔹 Spring & Spring Boot Interview Questions & Answers :

Q4: What is Spring Framework?
A:
Spring is a lightweight, open-source framework for building Java-based applications. It supports dependency injection, aspect-oriented programming, and simplifies enterprise app development.

Q5: What is Spring Boot and why is it used?
A:
Spring Boot is a module of Spring Framework that helps in creating stand-alone, production-ready Spring-based applications with minimal configuration. It uses auto-configuration and starter dependencies.

Q7: Difference between @Component, @Service, and @Repository?
A:
All three are stereotype annotations:

• @Component: Generic bean.

• @Service: Marks business layer logic.

• @Repository: Used in DAO layer, with additional exception translation capabilities.

🔹 REST API & Microservices Interview Questions :

Q8: What is a RESTful Web Service?
A:
A RESTful service uses HTTP to perform CRUD operations (Create, Read, Update, Delete) on resources represented by URIs, using standard methods like GET, POST, PUT, DELETE.

Q9: How do you secure REST APIs?
A:
Using methods like:

• OAuth2

• JWT (JSON Web Tokens)

• HTTPS

• API keys and token validation

Q10: What are microservices?
A:
Microservices are small, independent services that work together. Each microservice is independently deployable and focuses on a specific business function.

🔹 Hibernate Questions :

Q11: What is Hibernate and how does it differ from JDBC?
A:
Hibernate is an ORM (Object Relational Mapping) tool that maps Java objects to database tables.

Q12: What is the difference between get() and load() in Hibernate?
A:

• get(): Immediately fetches the object; returns null if not found.

• load(): Returns a proxy; throws ObjectNotFoundException if not found.

🔹 SQL Questions :

Q13: Write a query to get the second highest salary.

Q14: What is normalization?
A:
Normalization is the process of organizing data to reduce redundancy and improve data integrity.

🔹 HR Questions :

Q15: Why do you want to join Capgemini?
A:
Capgemini is a global leader in consulting, technology, and digital transformation. I value its emphasis on innovation, learning opportunities, and inclusive culture, making it the ideal place to grow professionally.

Q16: Describe a challenging situation and how you handled it.
A:
(Use the STAR method: Situation, Task, Action, Result — tailor it based on your experience.)