两种方法删除ArrayList里重复元素

1.方法一: Java代码 /** List order not maintained **/ public static void removeDuplicate(ArrayList arlList) { HashSet h = new HashSet(arlList); arlList.clear(); arlList.addAll(h); }

2.方法二: Java代码 /** 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); }