Скачать или смотреть Java 8 Stream API Interview Questions: Find Duplicate Values in a List Using Stream API in Java 8

Q6. Find the Duplicate Values from a List using Stream API Java 8
Welcome to Learn Code With Saurabh! In this video, you will learn that the Java program demonstrates how to use Java 8 Streams to perform conditional filtering on collections.

Explanation of the code:
This Java program uses the Stream API to find duplicate elements in a list. Here's how it works:
1. Input List: The program defines a list of integers: [1, 2, 3, 4, 5, 6, 3, 4, 7, 8, 6], where 3, 4, and 6 are duplicated.

2. Tracking Duplicates:
o A Set Integer seen is used to track which elements have been encountered.
o The .add(i) method returns false if the element i has already been added to the set, meaning it’s a duplicate.

3. Stream Operations:
o numbers.stream(): Creates a stream from the list of integers.
o filter(i - !seen.add(i)): Filters out elements that are being added to the set for the first time, keeping only the duplicates.
o .distinct(): Ensures that the duplicates themselves are listed only once, even if they appear multiple times.
o .collect(Collectors.toList()): Collects the filtered duplicate elements into a list.
4. Output: The program prints the list of duplicate elements: [3, 4, 6].
Key Points:
• Set.add() is used to identify duplicates by checking if the element already exists in the set.
• distinct() ensures that the final result only contains unique duplicates.
• The approach is efficient and ensures that the duplicates are listed only once, regardless of how many times they appear in the original list.

Output:
3, 4, 6

Source Code: https://github.com/learncodewithsaura...

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