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Thread: Address Book Program in java

  1. #1
    Junior Member
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    Default 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!


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Address Book Program in java

    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

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