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);
}

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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);
}


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