copytext.java

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import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class CopyText extends JPanel {
JTextField sourceTextField;
JTextField targetTextField;
JButton button;

CopyText()
{
sourceTextField = new JTextField("source.textfield",20);
button=new JButton("copy"); 
button.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
String text = sourceTextField.getText();
targetTextField.setText(text);
}
});
targetTextField = new JTextField("target textfield",20);
JPanel panel= new JPanel();
panel.setLayout(new FlowLayout());
panel.add(sourceTextField);
panel.add(button);
this.setLayout(new BorderLayout());
this.add(panel,BorderLayout.NORTH);
this.add(targetTextField,BorderLayout.SOUTH);
}
public static void main(String[ ] args) {
JFrame frame= new JFrame("Copy Text");
frame.addWindowListener(new CloseWindow());
frame.getContentPane().add(new CopyText());
frame.pack();
frame.show();
}
}

class CloseWindow extends WindowAdapter
{
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
}