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

public  class CloseableFrame extends Frame
  { public CloseableFrame()
      { addWindowListener(new WindowAdapter()
          {public void windowClosing(WindowEvent e) {System.exit(0);}});
        setSize(300,300);
        setTitle(getClass().getName());
      }

    public static void main(String[] args)
      { CloseableFrame f = new CloseableFrame();
        f.setVisible(true);
      }
  }