public class Interfaces {
    public static void main(String[] args) {
        JFrame v = new JFrame();
        v.setLayout(new BorderLayout());
        v.setBounds(100, 100, 450, 300);
Hugo: import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.*;
import javax.swing.border.EmptyBorder;

public class Interfaces {
    public static void main(String[] args) {
        JFrame v = new JFrame();
        v.setLayout(new BorderLayout());
        v.setBounds(100, 100, 450, 300);

        JPanel panel = new JPanel();
        v.add(panel, BorderLayout.SOUTH);
        panel.setLayout(new BorderLayout(0, 0));

        JPanel panel_1 = new JPanel();
        panel.add(panel_1, BorderLayout.EAST);
        panel_1.setLayout(new BoxLayout(panel_1, BoxLayout.Y_AXIS));

        final JButton btnNewButton_3 = new JButton("New button");
        panel_1.add(btnNewButton_3);

        JButton btnNewButton_4 = new JButton("New button");
        panel_1.add(btnNewButton_4);

        JButton btnNewButton_2 = new JButton("New button");
        panel_1.add(btnNewButton_2);

        JPanel panel_2 = new JPanel();
        panel.add(panel_2, BorderLayout.WEST);

        JButton btnNewButton = new JButton("New button");
        panel_2.add(btnNewButton);

        JButton btnNewButton_1 = new JButton("New button");
        panel_2.add(btnNewButton_1);




        btnNewButton_3.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent arg0) {
                //label1.setText("¡Adiós mundo!");
                //label1.setText(editorPane.getText());
                btnNewButton_3.setText(btnNewButton_3.getText()+"1");
            }
        });


        v.pack();
        v.setVisible(true);
        v.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
}