java list 去除重复值

1、//  删除ArrayList中重复元素

1 public List removeDuplicate(List list)  {
2     HashSet hashSet = new HashSet(list);
3     list.clear();
4     list.addAll(hashSet);
5     return list;
6 }

2、// 删除ArrayList中重复元素，保持顺序

 1 public static void  removeDuplicateWithOrder(List list)  {
 2       Set set  =  new  HashSet();
 3       List newList  =   new  ArrayList();
 4       for  (Iterator iter  =  list.iterator(); iter.hasNext();)  {
 5          Object element  =  iter.next();
 6          if  (set.add(element))
 7             newList.add(element);
 8      } 
 9      list.clear();
10      list.addAll(newList);
11      System.out.println( " remove duplicate "   +  list);
12  }

3、// 删除ArrayList中重复元素

 1  //  删除ArrayList中重复元素 
 2  public   static   void  removeDuplicate(List list)  {
 3    for  ( int  i  =   0 ; i  <  list.size()  -   1 ; i ++ )  {
 4     for  ( int  j  =  list.size()  -   1 ; j  >  i; j -- )  {
 5       if  (list.get(j).equals(list.get(i)))  {
 6         list.remove(j);
 7       } 
 8     } 
 9   } 
10   System.out.println(list);
11 }

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

1 for (Iterator<List<String>> item = list1.iterator(); item.hasNext(); ){
2     List<String> it = item.next();
3     System.out.print(it);
4     if (it.get(4).equals("0.0")) {
5         item.remove();
6     }
7 }

java list 去除 重复值

java list 去除重复值