How to Convert an ArrayList to a HashSet?

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This code example shows how to convert ArrayList to HashSet:

import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

public class ArrayListToHashSet {

  public static void main(String[] args) {
    List list = new ArrayList();
    list.add(null);
    list.add("A"); 
    list.add("B");
    Set hashset = new HashSet(list);
    list = new ArrayList(hashset);
    System.out.println(list.toString());
  }
}

The above code example also can be used to remove duplicate items from an ArrayList.

import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

public class ArrayListToHashSet {

 public static void main(String[] args) {
  List list = new ArrayList();
  list.add(null);
  list.add("A");
  list.add("A");
  list.add("A");
  list.add("A");
  list.add("B");
  list.add("B");
  list.add("B");
  list.add("C");
  Set hashset = new HashSet(list);
  list = new ArrayList(hashset);
  System.out.println(list.toString());
 }

}