Remove duplicate emements

import java.util.Arrays;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.SortedSet;
import java.util.TreeSet;


public class RemoveDuplicates {

public static void main(String[] args){
//string array contains duplicate elements
String[] duplicateEntries = {"A","B","C","A"};
//Access this array as list
List listEntries = Arrays.asList(duplicateEntries);
//remove duplicate elements
Set setEntries = new HashSet(listEntries);
//sort elements - natural order
SortedSet sortedSet = new TreeSet();
//add all entries from set
sortedSet.addAll(setEntries);
for(String entries : sortedSet){
System.out.println("Unique Entries : " + entries);
}
}
}