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(12)                 out.close();  //关闭文件
                System.out.println("clear data true!");
            }catch(IOException e){}
         }else{
                System.err.println("File \"data\" Missing!");
         }
    }
    public void deleteData(long deleteNumber)//删除某条数据
    throws IOException,FileNotFoundException
    {
        isDelete = true;
        try{
        DataMap mp = new DataMap();//生成一个自己编写的容器
        long j=0;
        String s1="",s2="",s3="";
            BufferedReader in =
                new BufferedReader(
                        new FileReader("data.txt"));
            while ((s1=in.readLine())!=null)
            {
                j=numberTokenizer(s1);
                mp.put(j,s1);
            }
            try{