import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.KeyEvent;
import javax.swing.AbstractAction;
import javax.swing.InputMap;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextArea;
import javax.swing.JWindow;
import javax.swing.KeyStroke;

public class Test extends JWindow
{
    private JPanel container;

    private JTextArea textArea;

    public Test(JFrame owner) {
        super(owner);
        setLayout(new BorderLayout());
        setFocusableWindowState(true);

        container = new JPanel();
        textArea = new JTextArea("foo bar");

        final String key = "exitAction";
        final InputMap inputMap =
            textArea.getInputMap(JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT);
        inputMap.put(KeyStroke.getKeyStroke(KeyEvent.VK_F12, 0), key);
        textArea.getActionMap().put(key, new AbstractAction() {
            public void actionPerformed(ActionEvent e) {
                System.exit(0);
            }
        });

        container.add(textArea);
        getContentPane().add(container, BorderLayout.CENTER);
        setSize(400, 400);
        setLocationRelativeTo(null);
        setVisible(true);
    }

    public static void main(String[] a) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                final JFrame frame = new JFrame("test");
                frame.setVisible(true);
                new Test(frame);
            }
        });
    }
}