Instantiation and communication

Question

Hi there
I'm having problems with communication between classes within an application. I am instantiating objects of one class from within a main class, but these objects need to use methods located in the main class so the objects need to know where the main class is and the main class needs to know which of the objects is using the method so it can communicate back. I think I understand the theory, but I can't make it work. Here are the relevent bits of the code (the rest of the programme is long and boring) - can anyone help?
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;
import javax.swing.event.*;
import java.util.*;
import java.lang.*;
public class Machine
     private JFrame cbFr = new JFrame();
     private JLabel labCb = new JLabel();                    
     public Machine()
               Kam k1 = new Kam();
     public static void main(String [] args)
               Machine m1 = new Machine();
class Kam implements ActionListener, ItemListener //this the main class
          public Kam()                         
                    Cb a = new Cb(this);
                    cbFr.setLocation(20,230);
                    labcb = new JLabel("CbA ");
                    cbFr = new JFrame("CbA");
                    Cb b = new Cb(this);
                    cbFr.setLocation(20,230);
                    labcb = new JLabel("CbB ");
                    cbFr = new JFrame("CbB");                              Cb c = new Cb(this);
                    cbFr.setLocation(20,230);
                    labcb = new JLabel("CbC ");
                    cbFr = new JFrame("CbC");
class Cb implements ActionListener //class that builds the cb obj above
private String location;
          private Object empty, name, k1;
          public Cb(Kam k1) //trying to hold the location of
the main class
                    k1 = (String)kMachine;
                    drawCbDisplay( );
          public Object getName() //trying to hold the identity
of the objects
                    name = (Object)location;
                    return name;
          public void actionPerformed(ActionEvent ae)                     {     
               if (ae.getSource() == butE)
               k1.validation(); //a main
class method
}          

Answer 1

If you want Kam to call methods from Machine, construct it like this:
Kam k1 = new Kam(this);And change the constructor to this:
public Kam(Machine m)Is that what you meant?
Cheers,
Radish21