How to convert a Set to List in Java

Question

Hi Team,

I have one set in Java. I want to convert the set to a list. How to do that?

Answer 1

Hi@MD,

The most straightforward way to convert a set to a list is bypassing the set as an argument while creating the list. This calls the constructor and from there onwards the constructor takes care of the rest.

import java.util.*;
public class Main {
    public static void main(String[] args)
    {
        Set<Integer> a = new HashSet<>();
        a.add(1);
        a.add(2);
        a.add(3);
        a.add(1);
     List<Integer> arr = new ArrayList<>(a);
     System.out.println(arr);
     System.out.println(arr.get(1));
    }
}

Hope this helps!

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Thanks!