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
        }