Java Streams Coding Interview Questions - Find sum of all digits of a number using Java Streams
➕ Find the Sum of All Digits of a Number Using Java Streams | Java 8 Stream API Coding Interview Question ➕
In this video, you’ll learn how to find the sum of all digits of a number in Java 8 using the Stream API — a clean, functional approach that replaces manual loops with concise and readable code.
This problem is a common coding interview question that helps you practice breaking down numbers into individual digits and applying aggregation operations like sum().
🧠 What You’ll Learn:
✅ How to convert a number into a stream of digits
✅ Use String.valueOf() and chars() for digit extraction
✅ Map characters to integers using map(Character::getNumericValue)
✅ Apply sum() to aggregate digit values
✅ Functional, loop-free coding style with Java 8
💡 Why This Is Useful for Java Developers:
🔹 Strengthens understanding of numeric stream operations
🔹 Teaches functional techniques for digit-based problems
🔹 Prepares you for Java interview questions and coding tests
🔹 Shows how to avoid manual digit extraction with % and /
👨💻 Who Should Watch This Video:
✔️ Java developers preparing for interviews
✔️ Students learning Java 8 Streams and functional programming
✔️ Engineers who want to write cleaner, declarative code
✔️ Anyone practicing number manipulation in Java
📺 Watch This If You Want To:
🔹 Learn how to process numbers as streams in Java
🔹 Replace loops with functional programming techniques
🔹 Understand character-to-digit conversion in streams
🔹 Practice stream-based problem solving for coding interviews
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💬 Have you tried solving digit sum problems without loops? Share your method in the comments!
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