Help please with JFRAMES swing and variables

Question

Hi...I need some help with Swing.I need to use the variable "datauser" and read it to operate with it( add,multiply,etc)
I have two independants JFrames.(2 classes in different .java files).
//FRAME1 get user data
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.*;
public class FRAME1 extends javax.swing.JFrame {
          public double datauser; //i need this variable
          public JPanel jPanel1;
          public JTextField jTextField1;
          public FRAME1(){
          datauser=this.datauser;
          jPanel1 = new JPanel();
     jTextField1 = new JTextField();
          jTextField1.setText("10");
          JPanel1.add(jTextField1);
          jTextField1.addActionListener(new hearme());
          pack();
class hearme implements ActionListener{
public void actionPerformed(ActionEvent e)
{     datauser= Double.parseDouble(jTextField1.getText()); //people write a number
In other JFrame class (another .java file) i put:
public class FRAME2 extends javax.swing.JFrame
          double aux;
          double multiplyby100() {
          aux= datauser *100;
          return aux;
ANd i cant get anything just errors ..how can i relate to variables from differents Jframes?? I mean..how can i use a variable from Jframe1 in Jframe2. The actual value that people type in that textfield

Answer 1

oh well thx for ur help...
I meant ..i have 10 differentes Jframes (10 different clases)
SO i have 10 differents windows...Then with a combobox ill choose what Jframe will appear.When a window appears i put ,for instance,parameters for calculating a circle area .Then i select rectangle in the combobox list and appear in the principal window its parameters to write in. Then i choose another element in that combobox and i put parameters for a square.Each one is a different window.I dont want to use Jdialog for that.
The problem is that i want to use a variable defined in one frame to use that value in another class....for example i want to use a variable like this
double side =double.parse(Textfield.getText()); //in a texfield in frame 1
And do something with "side" but in a different class.(different file in the same package)
public class hi() {
double theside;
theside=side; //<---------- here i have problems
//how can i use the variable "side" in the class hi
The exact point is that i want to get all the parameters from the user for each window that appears.And each class Jframe have their own variables .
And i want to access to those variables in real time (what people type)
So i cant find any solution.I have a structure for each window with labels and textfields (to put parameters).And i need to save each variable that people type in those textfields in public variables because i need to operate with data in a different class (for example in a main class).But that data is only saved into the particular classes because variables exist in there.
Thanks in advance for ur answers .I havent slept for hours trying to think of that
thanks!