Serializing Objects and reading data in

[Andy]

Hi,

In the code below (not pretty I know but it's an early version :-P) I'm
having problems reading the data object back in. If I move the reading
code to immediately after the section where it is written ( commented
out in code) then it reads in OK. However, when I move the code to the
right place ( as shown here) it throws an IO exception. Both the Filter
class and it's constituent class implement Serializable and it would seem
the data is there as it can read it into a new Filter object (fcopy).

Any suggestions please? I'm fairly new to Java.

Cheers

Andy


public static void main(String[] args) {

int i = args.length;

Filter f = new Filter();
Filter fcopy = new Filter();
File fname;

if (i > 0 ) {

if (args[0].equals("-learn") && i == 3) {
f.learn(args[1], args[2]); // lookup the spam and ham data
f.generateMainH ash();

fname = new File("Data");
try {
ObjectOutputStr eam oos = new ObjectOutputStr eam(new FileOutputStrea m(fname));
oos.writeObject (f);
oos.close();
System.out.prin tln("Spam Database successfully created");


// read the database
//ObjectInputStre am ois = new ObjectInputStre am(new FileInputStream (fname));
//fcopy = (Filter)ois.rea dObject();
//ois.close();
//System.out.prin tln("Data read in successfully");
}
catch (IOException e) {
System.out.prin tln("Fatal Error (0): Writing Data");
System.exit(1);
}
//catch (ClassNotFoundE xception cnfe) {
// System.out.prin tln("Fatal Error (1): Class not found. Reading Data");
// System.exit(1);
//}
} else {
if (args[0].equals("-scan") && i == 2) {
fname = new File("Data");
try {
// read the spam database
ObjectInputStre am ois = new ObjectInputStre am(new FileInputStream (fname));
fcopy = (Filter)ois.rea dObject();
ois.close();
System.out.prin tln("Data read in successfully");
}
catch (IOException e) {
System.out.prin tln("Fatal Error (0): Reading Data");
System.exit(1);
}
catch (ClassNotFoundE xception cnfe) {
System.out.prin tln("Fatal Error (1): Class not found. Reading Data");
System.exit(1);
}

fcopy.spamTest( args[1]);
} else {
System.out.prin tln("Usage: MainFilter -learn <spam folder> <ham filter>\n" +
" MainFilter -scan <testfolder>" );
}

}
} else {
System.out.prin tln("Usage: MainFilter -learn <spam folder> <ham filter>\n" +
" MainFilter -scan <testfolder>" );
}
}
}