import java.awt.* ;
import java.awt.event.* ;
import javax.swing.* ;

class TerminationListener implements WindowListener {
    public void windowActivated(WindowEvent e) {}
    public void windowClosed(WindowEvent e) {}
    public void windowClosing(WindowEvent e) {
        System.exit(0) ;
    }
    public void windowDeactivated(WindowEvent e) {}
    public void windowDeiconified(WindowEvent e) {}
    public void windowIconified(WindowEvent e) {}
    public void windowOpened(WindowEvent e) {}
}

class ToolTipPanel extends JPanel {
    public ToolTipPanel() {
        redButton = new JButton("Red") ;
        blueButton = new JButton("Blue") ;
        greenButton = new JButton("Green") ;

        add(redButton) ;
        add(blueButton) ;
        add(greenButton) ;

        redButton.setToolTipText("Set red background") ;
        blueButton.setToolTipText("Set blue background") ;
        greenButton.setToolTipText("Set green background") ;
    }

    private JButton redButton ;
    private JButton blueButton ;
    private JButton greenButton ;
}

public class ToolTipTest {
    public static void main(String [] args) {
        
        JFrame frame = new JFrame() ;

        frame.setTitle("ToolTipTest") ;
        frame.setSize(450, 300) ;

        frame.addWindowListener(new TerminationListener()) ;

        frame.getContentPane().add(new ToolTipPanel()) ;

        frame.setVisible(true) ;
    }
}