油漆未干

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http://live-free-or-die-hard.blogbus.com/logs/35452769.html

Java中可以这样实现，很简洁

方法一：这种方法不能保持原来的顺序

public static void removeDuplicate(ArrayList arlList)

  {
   HashSet h = new HashSet(arlList);

   arlList.clear();

   arlList.addAll(h);
  }

方法二：可以保持原来顺序

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);

}