Clase Agosto

package aprendiendointerfaces;

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

public class Gui01 extends JFrame{

      private JLabel lbl1, lbl2;
      private JTextField txt1,txt2;
      private JButton btn;

      public Gui01(){

             lbl1=new JLabel("Original");
             lbl2=new JLabel("Copia");
             btn=new JButton(">");
             txt1=new JTextField(15);
             txt2=new JTextField(15);

             btn.addActionListener(new OyenteCopia());

             add(lbl1);
             add(txt1);
             add(btn);
             add(lbl2);
             add(txt2);


             setLayout(new FlowLayout(FlowLayout.CENTER,5,5));
             setVisible(true);
             setSize(400,150);
             setDefaultCloseOperation(EXIT_ON_CLOSE);



          }

          public static void main(String[] args) {
           Gui01 intf=new Gui01();

    }

    class OyenteCopia implements ActionListener{

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

    }