About calling the memorybuffer......

Question

Hello everyone....i've writen the following code:
import java.io.*;
public class UserInfo {
public static void main(String[] args)
throws IOException {
     String k,l,m,n,o,p,q,r;
BufferedReader stdin = new BufferedReader(
new InputStreamReader(System.in));
System.out.print("First name:");
     k=stdin.readLine();
     System.out.print("Last name:");
     l=stdin.readLine();
     System.out.print("D.O.B:");
     m=stdin.readLine();
     System.out.print("Address:");
     n=stdin.readLine();
     System.out.print("Town:");
     o=stdin.readLine();
     System.out.print("Postcode:");
     p=stdin.readLine();
     System.out.print("Phone:");
     q=stdin.readLine();
     System.out.print("E-Mail:");
     r=stdin.readLine();
     try {
DataOutputStream out = new DataOutputStream(
new BufferedOutputStream(
new FileOutputStream("Data.txt")));
     out.writeUTF(k);
     out.writeUTF(l);
     out.writeUTF(m);
     out.writeUTF(n);
     out.writeUTF(o);
     out.writeUTF(p);
     out.writeUTF(q);
     out.writeUTF(r);
     out.close();
     DataInputStream in = new DataInputStream(
new BufferedInputStream(
new FileInputStream("Data.txt")));
     System.out.println(in.readUTF());
System.out.println(in.readUTF());
     System.out.println(in.readUTF());
     System.out.println(in.readUTF());
     System.out.println(in.readUTF());
     System.out.println(in.readUTF());
     System.out.println(in.readUTF());
     System.out.println(in.readUTF());
     } catch (NumberFormatException e) {
     System.out.println(e);
I ve done this in order to expand the information about the users that will use my bankaccount program.Now i want these information to be retrieved from the file that they re being saved when the bank is opened and stored to a memory buffer.then the memory should be updated after every transaction and be closed when the bank is closed....how can i do this....???

Answer 1

This thread shows one approach you could use:
http://forum.java.sun.com/thread.jsp?forum=31&thread=308693
And here is a class you can use to test it:
public class MemberTester
     public static void main(String[] args)
          FlatFileMemberManager mm = new FlatFileMemberManager( "members.txt" );
          System.out.println( mm );
          Member m1 = new Member( "abc", "123", "rob", "[email protected]" );
          Member m2 = new Member( "def", "111", "bob", "[email protected]" );
          Member m3 = new Member( "zzz", "222", "ted", "[email protected]" );
          Member m4 = new Member( "yyy", "333", "sam", "[email protected]" );
          System.out.println( m1 );
          mm.add( m1 );
          mm.add( m2 );
          mm.add( m3 );
          mm.add( m4 );
          System.out.println( mm );
          System.out.println( mm.get("abc") );
          System.out.println( mm.get("rob") );
          mm.delete( m2.getUserid() );
          System.out.println( mm );
}