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Java - remove duplicates from ArrayList using HashSet

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Created by:
Kara
351

In this article, we would like to show you how to remove duplicates from ArrayList in Java.

Quick solution:

Set<String> mySet = new HashSet<>(myArrayList);

 

Practical example

In this example, we create HashSet from the letters ArrayList to remove duplicates.

import java.util.*;

public class Example {

    public static void main(String[] args) {
        List<String> letters = new ArrayList<>();

        letters.add("A");
        letters.add("A");
        letters.add("A");

        letters.add("B");
        letters.add("B");

        letters.add("C");

        Set<String> distinctSet = new HashSet<>(letters);  // removes duplicates

        System.out.println(distinctSet);
    }
}

Output:

[A, B, C]

Java Collections - ArrayList

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