Bagaimana untuk mengalih keluar elemen berlebihan dari objek ArrayList di Jawa?

import java.util.ArrayList;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;
public class RemovingDuplicates {
   public static void main(String[] args){
      //Instantiating an ArrayList object
      ArrayList<String> list = new ArrayList<String>();
      list.add("JavaFX");
      list.add("Java");
      list.add("JavaFX");
      list.add("OpenCV");
      list.add("Java");
      list.add("JOGL");
      list.add("JOGL");
      list.add("HBase");
      list.add("Flume");
      list.add("HBase");
      list.add("Impala");
      System.out.println("Contents of the Array List : \n"+list);
      //Retrieving Iterator object of the ArrayList class
      Iterator<String> it = list.iterator();
      //Creating an empty Set object
      Set<String> set = new HashSet<String>();
      //Adding elements of the ArrayList to the Set object
      while(it.hasNext()) {
         set.add(it.next());
      }
      //Removing all the elements from the ArrayList
      list.clear();
      //Adding elements of the set back to the list
      list.addAll(set);
      System.out.println("Contents of the Array List after removing duplicate elements: \n"+list);
   }
}

Contents of the Array List :
[JavaFX, Java, JavaFX, OpenCV, Java, JOGL, JOGL, HBase, Flume, HBase, Impala]
Contents of the Array List after removing duplicate elements:
[JavaFX, Java, OpenCV, JOGL, Flume, Impala, HBase]