Java 8 Stream API Interview Questions: Sum and Sort Transactions by Date in Java 8 Streams API
Q65. How to find the sum of transaction amounts for each day from a given list of transactions and sort them by date using the Java 8 Streams API?
Learn how to solve a common coding problem using the Java 8 Streams API! In this tutorial, we’ll walk you through:
✅ Calculating the sum of transaction amounts for each date.
✅ Grouping transactions by date using Collectors.groupingBy().
✅ Summing amounts with Collectors.summingInt().
✅ Sorting the results by date in ascending order.
Sample Problem:
Given a list of transactions with dates and amounts, calculate the total amount for each date and display the results in ascending date order.
Sample Input:
Date Amount
2024-12-23 100
2024-12-24 200
2024-12-25 300
2024-12-23 400
2024-12-24 500
Sample Output:
Date Amount
2024-12-23 500
2024-12-24 700
2024-12-25 800
Key Concepts Covered:
🎯 Grouping data by key using Collectors.groupingBy().
🎯 Summing values for each group with Collectors.summingInt().
🎯 Sorting results using Map.Entry.comparingByKey().
🎯 Using Streams for clean and efficient data processing.
Code Used in Video:
All the code used in this video is explained step-by-step for beginners and advanced Java developers.
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Source Code:
https://github.com/learncodewithsaura...
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