Java 8 Stream API Interview Questions: Flatten Nested Lists Using Stream API in Java 8
Q8. Flatten a List of Lists using Stream API Java 8 | #streamapi #codingchallenge #java8tutorials
Welcome to Learn Code With Saurabh! In this video, you will learn: Java program demonstrates how to use Java 8 Streams to perform conditional filtering on collections.
Explanation of the code:
This Java program demonstrates how to flatten a list of lists into a single list using streams and the flatMap() method.
1. Input Data: It defines a listOfLists consisting of three lists, each containing integers.
2. Flattening the List: The flatMap(List::stream) operation converts each sublist (a list of integers) into a stream of integers and flattens them into a single stream.
3. Collecting Results: The resulting stream of integers is collected into a single list using Collectors.toList().
4. Output: The program prints a flat list of integers: [1, 2, 3, 4, 5, 6, 7, 8, 9].
The method reference (List::stream) is used to call the stream() method of each sublist.
Source Code: https://github.com/learncodewithsaura...
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