标题: 删除ArrayList中重复元素 [打印本页] 作者: 王责彬 时间: 2014-8-20 17:00 标题: 删除ArrayList中重复元素 删除LIST中重复元素方法一：循环元素删除
// 删除ArrayList中重复元素
public static void removeDuplicate(List list) {
for (int i = 0; i < list.size() - 1; i++) {
for (int j = list.size() - 1; j > i; j--) {
if (list.get(j).equals(list.get(i))) {
list.remove(j);
}
}
}
System.out.println(list);
}
方法二：通过HashSet剔除
// 删除ArrayList中重复元素
public static void removeDuplicate(List list) {
Set set = new HashSet(list);
list.clear();
list.addAll(set);
System.out.println(list);
}
方法三： 删除ArrayList中重复元素，保持顺序
// 删除ArrayList中重复元素，保持顺序
public static void removeDuplicateWithOrder(List list) {
Set set = new HashSet();
List newList = new ArrayList();
for (Iterator iter = list.iterator(); iter.hasNext();) {
Object element = iter.next();
if (set.add(element))
newList.add(element);
}
list.clear();
list.addAll(newList);
System.out.println(" remove duplicate " + list);
}