双重Iterator 报错！！！！

 List list  = new ArrayList();
         list.add(new String[]{"0","s1","0038","45"});
         list.add(new String[]{"0","s2","0038","45"});
         list.add(new String[]{"0","s3","0039","45"});
         list.add(new String[]{"0","s4","0039","45"});
         list.add(new String[]{"0","s5","0039","45"});
 Iterator iter = list.iterator();
         Iterator iterCompare = list.iterator();
         String office_code = "";
         String turnId = "";
         double money = 0.00;
         while(iter.hasNext()){  //去掉某个元素只能调用iter.remove()方法。
             String[] str = (String[]) iter.next();
             if("".equals(office_code)){
                 office_code = str[2];
                 while(iterCompare.hasNext()){
                     String[] strCompare = (String[]) iterCompare.next();
                     if(office_code.equals(strCompare[2])){
                         money += Double.parseDouble(str[6]);
                         iterCompare.remove();
                     }
                 }
                 //数据库操作
                 System.out.println(str);
                 money = 0.00;//初始化金额
             }

             if(office_code.equals(str[2])){//主数据存在就删除
                 iter.remove();
                 continue;
             }
             office_code = "";//要汇总的数据删除完后
         }