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Java 8 - remove duplicated elements from List
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In this article, we would like to show you how to remove duplicated elements from List in Java 8.
Quick solution:
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List<Integer> numbers = List.of(1, 2, 3, 2, 1);2
System.out.println(numbers); // [1, 2, 3, 2, 1]3
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List<Integer> distinctNumbers = numbers.stream().distinct().collect(Collectors.toList());5
System.out.println(distinctNumbers); // [1, 2, 3]
In this example, we use Stream distinct() method to create a new list from the original one without duplicated elements.
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import java.util.*;2
import java.util.stream.Collectors;3
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public class Example {5
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public static void main(String[] args) {7
List<Integer> numbers = List.of(1, 2, 3, 2, 1);8
System.out.println("Original list: " + numbers); // [1, 2, 3, 2, 1]9
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List<Integer> distinctNumbers = numbers.stream().distinct().collect(Collectors.toList());11
System.out.println("Distinct elements: " + distinctNumbers); // [1, 2, 3]12
}13
}Output:
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Original list: [1, 2, 3, 2, 1]2
Distinct elements: [1, 2, 3]