Calling a variable from main class to other class

Question

How do I call a variable that is initialize in the Test.java into Sub.java?
I want to call the a, b, c that I have initialize in Test.java into Sub.java.
import java.util.*;
import java.lang.*;
import java.awt.*;
public class Test{
     public static void main(String args[]){
          int b;
          int c=1;
          int a=11;
          b = c + a;
          System.out.println(+b);
import java.util.*;
import java.lang.*;
import java.awt.*;
public class Sub{
     public void Subtraction(){
          if(a>c)
               b = a-c;
          else if(c>a)
               b = c-a;
          else if(a=c)
               b = a-c;
          System.out.println(+b);
}

Answer 1

This is, and I'm sorry but I don't know how else to say this, a real big mess.
I'll go through some (most/all) of it but honestly....
import java.awt.*;Many will tell you that you should use specific imports and not wildcards to increase ease of reading. I am not so personally picky about this but it would help you.
import java.awt.event.*;
import javax.swing.*;
import java.util.*; Don't import things you never use. It just adds confusion get rid of java.util import
import java.lang.Object.*;Redundant. Remove it.
import java.applet.Applet.*;Unused. get rid of it
public class SUBOK {      Terrible class name. Please use the standard [_Java naming conventions_|http://java.sun.com/docs/codeconv/html/CodeConventions.doc8.html]
public int a = 10;
    public static void main(String[] args) {
         SUBOK runGUI = new SUBOK();
    public SUBOK(){
         JFrame f = new JFrame("Subok");
         f.setSize(150,100);
         f.setVisible(true);
         f.setDefaultCloseOperation(f.EXIT_ON_CLOSE);
         JButton b = new JButton("Sum");
         b.setActionCommand("send");
         b.addActionListener(new Push());
         JPanel p = new JPanel();
         p.add(b);
         f.add(p);
    } Most of that is okay although not great. But I don't think you should be doing anything in Swing at all yet.
  private class Push implements ActionListener{
         public void actionPerformed(ActionEvent e){
              if(e.getActionCommand().equals("send")){
                   int a = 12;You are aware that this a has nothing to do with your other a? right? I mean this is a method local variable in a whole other class then the other one.
                       Add i = new Add();
                       i.Add();                
    public int aValue(){
         return a;
} Alrighty then...
import java.lang.*;Redundant. Remove You never need to import java.lang.
import java.awt.*;Unused. remove.
import java.util.*;Unused remove.
public class Add {
     SUBOK a = new SUBOK();
     int d = a.aValue(); Aiaiaiai.
  public void Add() {
         int b;
         int c = 0;
         b = d+c;
         System.out.println(b);
}First of all do not name a method the same as a class. Second most of this class appears to be based mainly in the realm of wishful thinking. In programming, wishing that something will "just work" without understanding the basics of why and how it works does, pretty much 100% of the time, not end well.
You need to take a number of steps back from this code, get grounded in some fundamentals and then make another attempt. I would highly recommend putting the Swing (or any other GUI) code aside for some time now. Inter-object communication is a fundamental part of OO and thus a fundamental part of Java and this code clearly shows that you don't understand it yet at all.
Start here [_Learning The Java Language_|http://java.sun.com/docs/books/tutorial/java/index.html]
If you have questions as you go through the tutorial do come back and ask them and someone here will be glad to help you. But in order to help you with code you have to be at a point where you understand things like variable scope, the difference between a class and an Object and how, why and what methods can be used to exchange information between two instances.