删除ArrayList中重复元素

来源：互联网发布：伦敦大学学院专业知乎编辑：程序博客网时间：2024/05/28 05:14

方法一：循环元素删除

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)   {     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
// 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); }

0 0