A newbie got stuck !

I am trying to write a small java applications. I created my 1st JPanel, and added a JTextBox and a button to it, in a 2nd JPanel I added a JTextBox only, now I added this 2 JPanel to a JFrame, I want to want to put up the text in JtextBox of Panel1 to JtextBox of Panel2 on hitting the button of JPanel1. I am adding an image for clarification , this small piece of code is done except the event-handling (the most important part).

If someone clears my doubts, and provides some code/link how to write codes for this kind of event handling, then it would be very helpful.
Please help, thanks in Advance.

Panel 1 needs a reference to panel 2 and panel 2 needs a getter for your text area for this to work.

Thank you ... it really helped me ...

ok , I did exactly the same, it works but there is a problem. When I try to get my Text (with SOP statements), of JtextArea2, I get what is expected, but in the UI it remains the same doesnot update.

Can you show us the exact code you are using to update it?

Panel2 is an instance variable, instantiated at the Constructor of Panel1

this is in my pannel2

And Panel2 is the exact same instance you added to your GUI? You haven't created another, invisible panel?

MynewPannel.java

import java.awt.Dimension;
import javax.swing.JTextArea;

/*
 * MyNewPanel.java
 *
 * Created on Jul 9, 2009, 8:54:01 PM
 */

/**
 *
 * @author Tirthankar Mukherjee
 */
public class MyNewPanel extends javax.swing.JPanel {

/** Creates new form MyNewPanel */
    public MyNewPanel() {
        initComponents();
         this.setPreferredSize(new Dimension(200,200));
    }

public JTextArea GetMyNewTextArea()
    {
        return MyNewTextArea;
    }

/** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">
    private void initComponents() {

jScrollPane1 = new javax.swing.JScrollPane();
        MyNewTextArea = new javax.swing.JTextArea();

MyNewTextArea.setColumns(20);
        MyNewTextArea.setRows(5);
        MyNewTextArea.setText("Hello World !!");
        jScrollPane1.setViewportView(MyNewTextArea);

javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this);
        this.setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 380, Short.MAX_VALUE)
                .addContainerGap())
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 278, Short.MAX_VALUE)
                .addContainerGap())
        );
    }// </editor-fold>

// Variables declaration - do not modify
    private javax.swing.JTextArea MyNewTextArea;
    private javax.swing.JScrollPane jScrollPane1;
    // End of variables declaration

}

import java.awt.Dimension;

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

/*
 * MyPanel.java
 *
 * Created on Jul 9, 2009, 8:50:18 PM
 */

/**
 *
 * @author Tirthankar Mukherjee
 */
public class MyPanel extends javax.swing.JPanel {

/** Creates new form MyPanel */
    MyNewPanel Panel2 ;
    public MyPanel() {
        initComponents();
        MyInitComponents();
        this.setPreferredSize(new Dimension(200,200));
    }

private void MyInitComponents()
    {
        //Panel 1 needs a reference to panel 2 and panel 2 needs a getter for your text area 
        Panel2 = new MyNewPanel() ;
        
    }

/** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">
    private void initComponents() {

MyButton = new javax.swing.JButton();
        jScrollPane1 = new javax.swing.JScrollPane();
        MyTextArea = new javax.swing.JTextArea();

MyButton.setText("Button");
        MyButton.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                MyButtonActionPerformed(evt);
            }
        });

MyTextArea.setColumns(20);
        MyTextArea.setLineWrap(true);
        MyTextArea.setRows(5);
        MyTextArea.setText("Hello !!");
        jScrollPane1.setViewportView(MyTextArea);

javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this);
        this.setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(MyButton, javax.swing.GroupLayout.Alignment.TRAILING)
                    .addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 380, Short.MAX_VALUE))
                .addContainerGap())
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 244, Short.MAX_VALUE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                .addComponent(MyButton)
                .addContainerGap())
        );
    }// </editor-fold>

private void MyButtonActionPerformed(java.awt.event.ActionEvent evt) {

Panel2.GetMyNewTextArea().setText(MyTextArea.getText());
        String s = Panel2.GetMyNewTextArea().getText();
    }

// Variables declaration - do not modify
    private javax.swing.JButton MyButton;
    private javax.swing.JTextArea MyTextArea;
    private javax.swing.JScrollPane jScrollPane1;
    // End of variables declaration

}

import java.awt.BorderLayout;

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

/*
 * NewJFrame.java
 *
 * Created on Jul 9, 2009, 8:54:56 PM
 */

/**
 *
 * @author Tirthankar Mukherjee
 */
public class NewJFrame extends javax.swing.JFrame {

/** Creates new form NewJFrame */
    public NewJFrame() {
        initComponents();
        this.setLayout(new BorderLayout());
        MyPanel MP = new MyPanel();
        this.add(MP,BorderLayout.WEST);
        this.add(new MyNewPanel(), BorderLayout.CENTER);
    }

/** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">
    private void initComponents() {

setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 400, Short.MAX_VALUE)
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 300, Short.MAX_VALUE)
        );

pack();
    }// </editor-fold>

/**
    * @param args the command line arguments
    */
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new NewJFrame().setVisible(true);
            }
        });
    }

// Variables declaration - do not modify
    // End of variables declaration

}

I know the full code with "system genereted one" .. its pretty bad ... even I dislike it ... but please help

This is my NetBeans Project file

My NetBeans Project

creating a new MyNewPanel() is not passing a reference of the one on the screen.

some changes

and

Just what I though. Your MyPanel instance has its own copy of MyNewPanel that is not added to the GUI.

You should give it a reference to the actual panel:

Heh, Michael beat me to it

Oh my GOD !!! Swing is swing pretty fast but I will hang on ... JavaRanch rocks !!

Most importantly many many thanks Rob and all of the above contributors.