import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JTextField;

import static javax.swing.SwingUtilities.invokeLater;
import static javax.swing.WindowConstants.DISPOSE_ON_CLOSE;

public class Test8011005 implements ActionListener, Runnable {
    public static void main(String[] args) {
        invokeLater(new Test8011005());
    }

    public JTextField text;

    @Override
    public void actionPerformed(ActionEvent event) {
        this.text.setEditable(!this.text.isEditable());
    }

    @Override
    public void run() {
        this.text = new JTextField("abcdefghijklmnopqrstuvwxyz");

        JButton button = new JButton("press");
        button.addActionListener(this);

        JFrame frame = new JFrame(getClass().getSimpleName());
        frame.add(BorderLayout.CENTER, this.text);
        frame.add(BorderLayout.EAST, button);
        frame.pack();
        frame.setLocationRelativeTo(null);
        frame.setDefaultCloseOperation(DISPOSE_ON_CLOSE);
        frame.setVisible(true);
    }
}