This repository contains PwC-focused Core Java interview questions and answers designed specifically for experienced Java developers.
Each question is explained with real-world use cases, clean code examples, and expected outputs, making it ideal for interview preparation.

📺 YouTube Video: PwC Core Java Interview Questions & Answers for Experienced
📌 Channel: Dip Developer
🔗 YouTube Channel Link: https://www.youtube.com/channel/UChZ0zLceo3T91iNtEK6kt0g

This repo is based on real PwC / Big-4 interview patterns and focuses on:

• Java 8 features
• Functional programming
• Streams & collections
• Multithreading & concurrency
• Design patterns
• HashMap internals

1. What are the main features of Java 8, and can you provide examples of each?
2. What do you mean by functional interface
3. Which built-in functional interfaces have you used?
4. Write your own custom functional interface
5. How can I use the Stream API to find the distinct department name from an ArrayList that contains employee names, salaries, and departments?
6. Coding example using flatMap to collect distinct cities from a list of employees (where each employee has a list of cities)?
7. Different ways of creating thread and which approach is better
8. How to create immutable objects in Java?
9. Coding example to implement the Singleton Design Pattern?
10. Difference between fail-fast and fail-safe iterators?
11. Difference between CopyOnWriteArrayList and ArrayList?
12. Explain HashMap internals --- how get() works?

• Java 8 or higher
• Core Java fundamentals
• Collections & OOP understanding

git clone https://github.com/TheDipDeveloper/pwc-core-java-interview.git

Open the project in your IDE and run the examples.

This repository accompanies the YouTube channel Dip Developer, where we cover:

• Java Interview Questions
• Spring Boot & Microservices
• Backend System Design
• Real-world Project Explanations

🔗 Subscribe here: https://www.youtube.com/channel/UChZ0zLceo3T91iNtEK6kt0g

📺 YouTube: Dip Developer

⭐ If this repo helps you, don't forget to star ⭐ the repository and subscribe 🔔 to the channel!