Java Stream API – 45+ Practice Problems

This repository contains 45+ hands-on problems based on Java Stream API, designed to help Java learners and backend developers master functional-style programming using streams.

Each problem focuses on real-time use cases like:

• Filtering & Mapping
• Sorting & Reducing
• Grouping & Counting
• Optional Handling
• Collectors & Custom Operations
• Streams on Lists, Maps, Arrays, Objects, and Nested Data

---

📂 Folder contains:

• ✅ Problem Statement (as comment)
• ✅ Solution using Stream API
• ✅ Main method to execute

---

🚀 How to Run

1. Clone the repository

   git clone https://github.com/username/Java-StreamAPI-Problems.git

• Open in any Java IDE

• IntelliJ IDEA / Eclipse / VS Code

• Run any problem file to test the solution

🎯 Learning Goals

• ✔ Understand and apply functional programming in Java
• ✔ Replace loops with elegant stream operations
• ✔ Prepare for interviews & coding assessments
• ✔ Write clean, readable, and optimized Java code

✅ Topics Covered

map(), filter(), reduce()
sorted(), distinct(), limit(), skip()
collect(), Collectors.groupingBy(), joining()
Optional usage with Streams
Streams with List, Set, Map, and custom objects

👨‍💻 Author

Srinivas Dappu
GitHub: https://github.com/srinivas6303
LinkedIn: https://www.linkedin.com/in/dappusrinivas/

⭐ If this repository helped you, don’t forget to star it!