File writing and reading

File file = new File(“aa.data”);
try {
// delete file if exists
file.delete();
file.createNewFile();
FileWriter fw = new FileWriter(file);
BufferedWriter bw = new BufferedWriter(fw);

            bw.write("123");
            bw.newLine();

        bw.flush();
        bw.close();
        fw.close();

    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        System.out.println("cookie write to file");
    }
    -----------------------------
    try {
    File file=new File("aa.data");
    FileReader fr=new FileReader(file);
    BufferedReader br=new BufferedReader(fr);
    String line;
    while((line=br.readLine())!= null)
    {
        StringTokenizer str=new StringTokenizer(line,"");

            System.out.print(str.nextToken()+"**");


    }


}
    catch(Exception e)
{
    e.printStackTrace();
}