Sr Java Developer Interview Questions

5,288 sr java developer interview questions shared by candidates

Q. What is the purpose of the hashCode() method? Ans. The hashCode() method generates a unique integer for an object, aiding in efficient data retrieval in hash-based collections. Used in hash-based collections like HashMap and HashSet for quick data access. Returns an integer value, which is the hash code of the object. Two equal objects must have the same hash code (consistent with equals()).
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Senior Java Developer

Interviewed at CGI

3.7
Sep 24, 2025

Q. What is the purpose of the hashCode() method? Ans. The hashCode() method generates a unique integer for an object, aiding in efficient data retrieval in hash-based collections. Used in hash-based collections like HashMap and HashSet for quick data access. Returns an integer value, which is the hash code of the object. Two equal objects must have the same hash code (consistent with equals()).

Timeframe - Please return within 72 hours. Please upload your finished product & send us the link to access it. In this technical challenge, you will build a SpringBoot web application that integrates with a PostgreSQL database and uses Docker to run in a container. The application should have a REST API that allows users to perform CRUD (create, read, update, delete) operations on a data model representing a simple e-commerce platform. The REST API should be defined using OpenAPI.
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Senior Java Developer

Interviewed at TeamViewer

3.4
Jan 29, 2024

Timeframe - Please return within 72 hours. Please upload your finished product & send us the link to access it. In this technical challenge, you will build a SpringBoot web application that integrates with a PostgreSQL database and uses Docker to run in a container. The application should have a REST API that allows users to perform CRUD (create, read, update, delete) operations on a data model representing a simple e-commerce platform. The REST API should be defined using OpenAPI.

Tell me about yourself What areas do you enjoy working with? Do you want to work as an Architect, Team Leader or Developer? How would you describe yourself? Would you like to work with C#? What makes you happy when you come to work? What are your weak points?
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Senior Java Developer

Interviewed at Vanderlande Industries

3.8
Oct 4, 2018

Tell me about yourself What areas do you enjoy working with? Do you want to work as an Architect, Team Leader or Developer? How would you describe yourself? Would you like to work with C#? What makes you happy when you come to work? What are your weak points?

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