两种方法删除ArrayList里重复元素

类别:Java 点击:0 评论:0 推荐:
这里有两种方法帮你删除在一个ArrayList里重复的elements。下面的程序片段里,removeDuplicate方法不维护顺序 (Order),而removeDuplicateWithOrder方法会保持顺序 (Order),但会有些性能上的牺牲。

The removeDuplicate Method:

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

The removeDuplicateWithOrder Method:

/** 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); }

本文地址:http://com.8s8s.com/it/it16506.htm