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Java - remove duplicates from ArrayList

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Created by:
Lennie-S
289

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


In the following example, to remove duplicates from letters ArrayList, we create a new ArrayList (filtered) and add the first appearance of each element from letters using contains() method. As a result, we receive a new ArrayList without duplicates.

Practical example:

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

        List<String> filtered = new ArrayList<>();

        for (String letter : letters) {
            if (!filtered.contains(letter)) {
                filtered.add(letter);
            }
        }

        System.out.println("Original ArrayList: " + letters);
        System.out.println("Without duplicates: " + filtered);
    }
}

Output:

Original ArrayList: [A, A, B, B, C, C]
Without duplicates: [A, B, C]

Java Collections - ArrayList

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