java ArrayList去重复值??方法一：循环元素删除?Java code//? 删除ArrayList中重复元素public?? static?? v
java ArrayList去重复值
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方法一：循环元素删除?
Java code
//? 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
Java code
//? 删除ArrayList中重复元素
? public?? static?? void? removeDuplicate(List list)?? {
??? HashSet h? =?? new? HashSet(list);
??? list.clear();
??? list.addAll(h);
??? System.out.println(list);
}
方法三： 删除ArrayList中重复元素，保持顺序
Java code
// 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);
}?
