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Java Engineer Interview Questions and Answers

Updated 20 Jun 2024

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Q1. System Design to create architecture of Whatsapp, dig deeper as it proceed

Ans.

Designing architecture for a messaging app like Whatsapp

  • Use a client-server architecture with a central server handling message routing and storage

  • Implement end-to-end encryption for secure communication

  • Utilize push notifications for real-time message delivery

  • Scale the system horizontally to handle large user base

  • Consider implementing features like group chats, voice/video calls, and file sharing

Q2. Optimal solution for 1 DSA question with string manipulation and sorting.

Ans.

Optimal solution for sorting an array of strings using built-in sorting algorithm in Java.

  • Use Arrays.sort() method to sort the array of strings in Java.

  • Ensure to import the Arrays class before using the sort() method.

  • Example: String[] arr = {"banana", "apple", "orange"}; Arrays.sort(arr);

Q3. Spring boot service to get some data

Ans.

Create a Spring Boot service to retrieve data

  • Create a REST controller to handle incoming requests

  • Use Spring Data JPA to interact with the database

  • Implement service layer to handle business logic

  • Use ResponseEntity to return data with appropriate HTTP status codes

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