public void saveAsDay(){
        SimpleDateFormat dataFormat=new SimpleDateFormat("yyyy-MM-dd'.txt'");
        String sToday=dataFormat.format(new Date()).toString();
        boolean hasToday=false;
        try{
            File dir=new File("./");
            String filename[]=dir.list();
            for(int i=1;i<filename.length;i++){
                if(filename[i].equals(sToday))
                    hasToday=true;
            }
            File acc=new File("./","account.txt");
            acc.createNewFile();
            if(hasToday){
                String s,tmp="";
                {
                    FileReader dataReader=new FileReader(acc);
                    BufferedReader readData=new BufferedReader(dataReader);
                    while((s=readData.readLine())!=null)
                        tmp+=(s+"\n");
                    readData.close();
                    dataReader.close();
                    acc.delete();    
                }
                {
                    File today=new File("./",sToday);
                    FileWriter dataWriter=new FileWriter(today,true);
                    BufferedWriter writeData=new BufferedWriter(dataWriter);
                    writeData.write(tmp);
                    writeData.close();
                    dataWriter.close();
                }

            }
            else{
                acc.renameTo(new File("./",sToday));
                
            }
                }