swing listeners

Listeners that needed when we want to deal with some event,

addWindowListener(new WindowAdapter())

public abstract class WindowAdapter
    implements WindowListener, WindowStateListener, WindowFocusListener
{
    /**
     * Invoked when a window has been opened.
     */
    public void windowOpened(WindowEvent e) {}

    /**
     * Invoked when a window is in the process of being closed.
     * The close operation can be overridden at this point.
     */
    public void windowClosing(WindowEvent e) {}

    /**
     * Invoked when a window has been closed.
     */
    public void windowClosed(WindowEvent e) {}

    /**
     * Invoked when a window is iconified.
     */
    public void windowIconified(WindowEvent e) {}

    /**
     * Invoked when a window is de-iconified.
     */
    public void windowDeiconified(WindowEvent e) {}

    /**
     * Invoked when a window is activated.
     */
    public void windowActivated(WindowEvent e) {}

    /**
     * Invoked when a window is de-activated.
     */
    public void windowDeactivated(WindowEvent e) {}

    /**
     * Invoked when a window state is changed.
     * @since 1.4
     */
    public void windowStateChanged(WindowEvent e) {}

    /**
     * Invoked when the Window is set to be the focused Window, which means
     * that the Window, or one of its subcomponents, will receive keyboard
     * events.
     *
     * @since 1.4
     */
    public void windowGainedFocus(WindowEvent e) {}

    /**
     * Invoked when the Window is no longer the focused Window, which means
     * that keyboard events will no longer be delivered to the Window or any of
     * its subcomponents.
     *
     * @since 1.4
     */
    public void windowLostFocus(WindowEvent e) {}
}

 
addItemListener(new ItemListener())

public interface ItemListener extends EventListener {

    /**
     * Invoked when an item has been selected or deselected by the user.
     * The code written for this method performs the operations
     * that need to occur when an item is selected (or deselected).
     */    
    void itemStateChanged(ItemEvent e);

}

 

addKeyListener(new KeyAdapter())

public abstract class KeyAdapter implements KeyListener {
    /**
     * Invoked when a key has been typed.
     * This event occurs when a key press is followed by a key release.
     */
    public void keyTyped(KeyEvent e) {}

    /**
     * Invoked when a key has been pressed.
     */
    public void keyPressed(KeyEvent e) {}

    /**
     * Invoked when a key has been released.
     */
    public void keyReleased(KeyEvent e) {}
}

 
addFocusListener(new FocusListener())

public interface FocusListener extends EventListener {

    /**
     * Invoked when a component gains the keyboard focus.
     */
    public void focusGained(FocusEvent e);

    /**
     * Invoked when a component loses the keyboard focus.
     */
    public void focusLost(FocusEvent e);
}

 
addActionListener(new ActionListener())

public interface ActionListener extends EventListener {

    /**
     * Invoked when an action occurs.
     */
    public void actionPerformed(ActionEvent e);

}

 
addMouseDoubleClickListener(new MouseAdapter())

public abstract class MouseAdapter implements MouseListener, MouseWheelListener, MouseMotionListener {
    /**
     * {@inheritDoc}
     */
    public void mouseClicked(MouseEvent e) {}

    /**
     * {@inheritDoc}
     */
    public void mousePressed(MouseEvent e) {}

    /**
     * {@inheritDoc}
     */
    public void mouseReleased(MouseEvent e) {}

    /**
     * {@inheritDoc}
     */
    public void mouseEntered(MouseEvent e) {}

    /**
     * {@inheritDoc}
     */
    public void mouseExited(MouseEvent e) {}

    /**
     * {@inheritDoc}
     * @since 1.6
     */
    public void mouseWheelMoved(MouseWheelEvent e){}

    /**
     * {@inheritDoc}
     * @since 1.6
     */
    public void mouseDragged(MouseEvent e){}

    /**
     * {@inheritDoc}
     * @since 1.6
     */
    public void mouseMoved(MouseEvent e){}
}