java list 去除 重复值

1、//  删除ArrayList中重复元素

public List removeDuplicate(List list)  {
    HashSet hashSet = new HashSet(list);
    list.clear();
    list.addAll(hashSet);
    return list;
}

2、// 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);
 }

3、// 删除ArrayList中重复元素 

 //  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);
}

自己使用： 删除 “0.0”的值

List<List<String>> list1 = (List<List<String>>) map.get("商品入库表"); //表1 入库详细表

//删除list中 数量为 0值

for (Iterator<List<String>> item = list1.iterator(); item.hasNext(); ){
    List<String> it = item.next();
    System.out.print(it);
    if (it.get(4).equals("0.0")) {
        item.remove();
    }
}