import java.awt.*;
import javax.swing.*;
import java.awt.event.*;


import java.awt.*;
import javax.swing.*;
import java.awt.event.*;


class Es10Panel extends JPanel implements ActionListener {
    JButton b;
    JTextField txt1, txt2;
    public Es10Panel(){
    super();
    b = new JButton("Aggiorna");
    txt1=new JTextField("Scrivere qui il testo", 25);
    txt2 = new JTextField(25); // larghezza in caratt.
    txt2.setEditable(false); // non modificabile
    b.addActionListener(this);
    add(txt1);
    add(txt2);
    add(b);
    }

public void actionPerformed(ActionEvent e){
      txt2.setText( txt1.getText() );
    }

}