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
- ✅ Problem Statement (as comment)
- ✅ Solution using Stream API
- ✅ Main method to execute
- Clone the repository
git clone https://github.com/username/Java-StreamAPI-Problems.git
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Open in any Java IDE
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IntelliJ IDEA / Eclipse / VS Code
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Run any problem file to test the solution
- ✔ 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
map(), filter(), reduce()
sorted(), distinct(), limit(), skip()
collect(), Collectors.groupingBy(), joining()
Optional usage with Streams
Streams with List, Set, Map, and custom objects
Srinivas Dappu
GitHub: https://github.com/srinivas6303
LinkedIn: https://www.linkedin.com/in/dappusrinivas/
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