两种方法删除ArrayList里重复元素

方法一::::::

/** List order not maintained **/

  public static void removeDuplicate(ArrayList arlList)
  {
   HashSet h = new HashSet(arlList);
   arlList.clear();
   arlList.addAll(h);
  }

=============================================================

方法二:::::::

/** List order maintained **/

public static void removeDuplicateWithOrder(ArrayList arlList)
{
Set set = new HashSet();
List newList = new ArrayList();
for (Iterator iter = arlList.iterator();    iter.hasNext(); ) {
Object element = iter.next();
   if (set.add(element))
      newList.add(element);
    }
    arlList.clear();
    arlList.addAll(newList);
}


==============================================================

你可能感兴趣的:(ArrayList)