Thread: Address Book Program in java

Hi im looking for help doing a small program, an addressbook that allows the user option to:

add contact, search contact and delete contact menu

all of this data is read and written to .dat file.

Also how would you create a layout in the data file, ie name,lastname,address and number?

my code:

public interface Inter
{
//Interface class
 
 
    public void addContact();
    public void deleteContact();
    public void searchContact();
    public void readFile();
}
 
public class Contact
{
 
    static String name;
    static String lastName;
    static String address;
    static String number;
 
 
 
 
    public Contact ()
    {
 
 
    }
 
 
}
 
 
 
 
public class Phonebook extends Contact implements Inter
    {
 
 
        public static void main(String[] args)
        {
 
 
        } // main
 
 
 
        @Override
        public void deleteContact()
        {
 
 
        }
 
        @Override
        public void searchContact()
        {
 
 
        }
 
 
 
        @Override
        public void addContact()
        {
 
            String details = null;
            System.out.println("Enter new contact i.e name:number:lastname ");
            InputStreamReader converter = new InputStreamReader(System.in);
            BufferedReader in = new BufferedReader(converter);
 
            try
            {
                details=in.readLine();
                String[] tokens =details.split(":"); // eg david :098:Needham
                name= tokens[0];
                lastName = tokens[1];
                address = tokens[2];
                number = tokens[3];
 
 
 
 
 
 
 
            }
 
            catch (IOException e1)
            {
 
            }
 
 
 
 
 
                FileWriter fw = null; // writes contact info to the dat file
                try
                {
                    fw = new FileWriter("data.dat");
                    fw.write(name);
                    fw.write(lastName);
                    fw.write(address);
                    fw.write(number);
 
                } catch (IOException e) {
 
                }
                BufferedWriter bw = new BufferedWriter(fw);
 
 
 
        }
 
 
 
 
 
 
        public void readFile() // reads contacts from dat file
        {
 
            try
            {
                BufferedReader in = new BufferedReader(new FileReader("data.dat"));
                 String str;
                    while ((str = in.readLine()) != null)
                    {
 
 
                    }
 
             }
 
 
            catch(Exception ex){}
 
 
 
        }
    }

Help is much apperciated!

Please post your questions or the text of the error messages you need help with.

how would you create a layout in the data file

You could put all those fields (name address etc) in one String separating each field with a ;
and write that String out to the file with a lineend character to separate one line from another