Converting a list of strings into a set of unique values

It is necessary to convert a list of strings into a set, leaving only unique elements.

import java.util.Collection;

public class JetbulbInterview {
    public static void main(String[] args) {
        Collection<String> source = Collections.singletonList("hello world");

        Set<String> uniqueSet = new HashSet<>(source);
    }
}