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Java - merge two Lists into HashSet

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Created by:

Joann-Calderon

383

In this article, we would like to show you how to merge two Lists into the HashSet in Java.

Quick solution:

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Set<String> mySet = new HashSet<>(myArrayList1);
mySet.addAll(myArrayList2);

Practical example

Edit

In this example, we merge letters1 and letters2 ArrayLists into alphabet HashSet using addAll() method.

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import java.util.*;
​
public class Example {
​
    public static void main(String[] args) {
        List<String> letters1 = new ArrayList<>();
​
        letters1.add("A");
        letters1.add("B");
​
        List<String> letters2 = new ArrayList<>();
​
        letters2.add("C");
        letters2.add("D");
​
        Set<String> alphabet = new HashSet<>(letters1);
        alphabet.addAll(letters2);
​
        System.out.println(alphabet);
    }
}