File Read/Write Help Please!

Question

Hi,
I am trying to get my program to write an object (or just its varibles) to a file and then be able to read them out again and assign them to their title. i.e be able to read String bo, int car, and int[][] cost to a file (doesn't matter what as long as I can save it and then open it at a later date).
I really can not figure it out, but I will include my simple test code.
public class Bob//contains the stuff I want to save
     int car= 10;
     int cost[][]= {{1000,10},{1744,47733}};
     String bo = "Bob";
import java.io.*;
import java.util.*;
public class ObjectS
     public static void main(String args[])
          new ObjectS();
     public ObjectS()
          Bob abc = new Bob();
          try
          {//This code is most likely crud, so I really need help here.
               FileOutputStream out = new FileOutputStream("theTime");
               ObjectOutputStream s = new ObjectOutputStream(out);
               s.writeObject("Today");
               s.writeObject(abc);
               s.flush();
          catch(FileNotFoundException e){}
          catch(IOException e){}
}

Answer 1

It has already been pointed out that you need to use 'Serializable' and that you need to do more than just ignore exceptions. SO, to spell it out
public class Bob//contains the stuff I want to saveshould be
public class Bob implements Serializable //contains the stuff I want to save
int car= 10;
int cost[][]= {{1000,10},{1744,47733}};
String bo = "Bob";
import java.io.*;
import java.util.*;
public class ObjectS
public static void main(String args[])
new ObjectS();
public ObjectS()
Bob abc = new Bob();
try
{//This code is most likely crud, so I really need
help here.
FileOutputStream out = new
FileOutputStream("theTime");
ObjectOutputStream s = new ObjectOutputStream(out);
s.writeObject("Today");
s.writeObject(abc);
s.flush();and this might be better as
s.close();
catch(FileNotFoundException e){}
catch(IOException e){}and these should do more than just ignore the exceptions! Exception are your freinds so as a very minimum you need something like
catch(FileNotFoundException e){
e.printStackTrace();
catch(IOException e){
e.printStackTrace();