Most Difficult Java 8 Stream Question Every Backend Developer Must Solve! | Code Decode

Pubblicato il: 07 maggio 2025
sul canale di: Code Decode

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In this video of code decode we have covered most difficult java 8 scenario based interview questions

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Top Java 8 scenario based interview questions

E-Commerce Java 8 Streams – Real-World Scenarios and Solutions
This collection of Java 8 Stream-based scenarios showcases how to apply functional programming to solve real-world problems in an e-commerce platform. Each use case is designed to reflect challenges commonly faced in backend systems, such as inventory tracking, customer behavior analysis, dynamic pricing, and order filtering. These solutions prioritize performance, readability, and clean design, making them both interview-ready and production-friendly.

1️⃣ Generate Category-wise Sales Report
You are tasked with generating a category-wise product sales report for the last 24 hours, with multiple filtering rules:

Consider only orders with a total value ₹500.

Exclude any products marked as "out of stock".

Group the filtered products by category.

Calculate the total quantity sold per category.

Return a result sorted by quantity in descending order.

✅ Solution:
Using a combination of filter, flatMap, groupingBy, and sorting via streams, the code provides a concise way to compute the required report using LinkedHashMap to maintain sorted order.

2️⃣ Detect Orders with Stock Issues
While processing orders, you must identify which orders exceed the available stock for any product:

You have a Map String, Integer representing the available stock per product.

Each order contains a list of Product objects with productId and quantity.

✅ Solution:
By using nested stream() and anyMatch, you can efficiently detect problematic orders where ordered quantity stock. This approach is ideal for inventory validation logic before confirming an order.

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