Total Java compiler problem confusion

Question

I am seeking some help and advice from those of you who use Java either as their first choice language or use it most of the time.
I am using Microsoft Visual J++ 6.0 after being given it free. I have also just done a Java programming home course. I can program in C++ so the learning curve was not too steep. I currently use Microsoft Visual C++ 6.0 for my C++ programming. This is why I am keen to use the MS Java program because the setup is very similiar and I like using it.
My problem comes into play when after completing the course I now try and type in the programs and compile them. They do not work, in fact I have had to make changes to the program to get it to work.
Now have I been taught incorrectly how to program in Java or is it simply the MS Java program which is not setup correctly? I have been told the MS program I am using uses only Java 1.1 and the current one is 1.4.1.
This is the program I was given as an example to follow and is supposed to work and is a Java program.
import java.io.*;
public class Class1
     public static void main (String [] args)
               throws IOException
               int num1, num2, sum;
               System.out.println ("Input a number: ");
               num1 = Course_io.readInt();
               System.out.println ("Input another number: ");
               num2 = Course_io.readInt();
               sum = num1 + num2;
               System.out.println ("The total is " + sum );
The error I get is, "Undefined name 'Course_io' (j0049)
Why? Have I not set up the compiler correctly or is the MS Vis J++ 6 compiler just a waste of time. If so, then why is it still available to purchase in shops?
I don't want to know how to get the program to work, rather what the problem is with compilers etc...
Sorry for the huge post but I would really appreciate some help on this frustrating matter.
Thanks,
Pk

Answer 1

let me modify ur code:
import java.io.*;
  public class Class1 {
   public static void main (String [] args) throws IOException {
   int num1, num2, sum;
   //added declaration
   BufferedReader in = new BufferedReader(
                          new InputStreamReader(System.in)); 
   System.out.println ("Input a number: ");
   num1 = Integer.parseInt(in.readLine()); 
   //num1 = Course_io.readInt();
   System.out.println ("Input another number: ");
   num2 = Integer.parseInt(in.readLine()); 
   //num2 = Course_io.readInt();
   sum = num1 + num2;
   System.out.println ("The total is " + sum );
}tnks to robert for input procedure