How to Remove Duplicates from HashSet

package org.best.example;

import java.util.*;

 public class HashSetTest
 {
     private String colors[] = { "red", "white", "blue",
     "green", "gray", "orange",
     "tan", "white", "cyan",
     "peach", "gray", "orange" };

     public HashSetTest()
     {
         ArrayList aList;

         aList = new ArrayList( Arrays.asList( colors ) );
         System.out.println( "ArrayList: " + aList );
         printNonDuplicates( aList );
     }

     public void printNonDuplicates( Collection c )
     {
         HashSet ref = new HashSet( c ); // create a HashSet
         Iterator i = ref.iterator(); // get iterator

         System.out.println( "\nNonduplicates are: " );
         while ( i.hasNext() )
             System.out.print( i.next() + " " );

         System.out.println();
     }

     public static void main( String args[] )
     {
         new HashSetTest();
     }
 }