What does the Following Code do? Can the LinkedHashSet be Replaced with a HashSet

import java.util.ArrayList;

import java.util.LinkedHashSet;

import java.util.List;

public class CollectionFunction {

    public <e> List<e> function (List <e> list) {

          return new ArrayList<e>(new LinkedHashSet<e>(list));

    }

}

The above code removes duplicates from a supplied list by passing it through an implementation of a Set interface. In this case, a LinkedHashSet is used to honor the ordering by implementing a SortedSet interface. If ordering is not required, the LinkedHashSet can be replaced with a HashSet.