import java.awt.*;
import java.awt.event.*;

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

class ClosableFrame extends Frame {
  public ClosableFrame(String name) {
    super(name);
    addWindowListener(new CloseListener());
  }
}