我写的Java学生成绩管理系统源代码

我写的Java学生成绩管理系统源代码(15)         String s = "",findString ="";
        long i;
        DataMap dm = new DataMap();
        BufferedReader in =
            new BufferedReader(
                    new FileReader("data.txt"));
        while ((s=in.readLine())!=null)
        {
            i=numberTokenizer(s);
            dm.put(i,s);
        }
        //in.close();
        try{
            if(dm.containsKey( String.valueOf(find).toString()))
            {
                findString = dm.get(find);
                System.out.println("学号"+find+"学生的资料是:");
                System.out.println(findString);
            }else
                throw  new NumberNotFoundException();
        }catch (NumberNotFoundException e){
            System.out.println(find+" no found :(");
            isFind = false;