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How do you convert a List to a Set in Java?

Question

How do you convert a List to a Set in Java?

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Solution

To convert a List to a Set in Java, you can follow these steps:

  1. Create a List object and initialize it with the desired elements.

    List<String> list = new ArrayList<>();
list.add("element1");
list.add("element2");
list.add("element3");

  2. Create a Set object and initialize it with the List.

    Set<String> set = new HashSet<>(list);

    Note that by passing the List as an argument to the HashSet constructor, it automatically converts the List to a Set.

  3. Now, the "set" object contains the elements from the List without any duplicates.

Here's the complete code snippet:

import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

public class ListToSetConversion {
    public static void main(String[] args) {
        List<String> list = new ArrayList<>();
        list.add("element1");
        list.add("element2");
        list.add("element3");

        Set<String> set = new HashSet<>(list);

        System.out.println("List: " + list);
        System.out.println("Set: " + set);
    }
}

When you run this code, it will output:

List: [element1, element2, element3]
Set: [element1, element2, element3]

As you can see, the List has been successfully converted to a Set.

This problem has been solved

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