The AdjustmentListener Interface
This interface defines the adjustmentValueChanged( ) method that is invoked when an
adjustment event occurs. Its general form is shown here:
void adjustmentValueChanged(AdjustmentEvent ae)
The ComponentListener Interface
This interface defines four methods that are invoked when a component is resized, moved,
shown, or hidden. Their general forms are shown here:
void componentResized(ComponentEvent ce)
void componentMoved(ComponentEvent ce)
void componentShown(ComponentEvent ce)
void componentHidden(ComponentEvent ce)
The ContainerListener Interface
This interface contains two methods. When a component is added to a container,
componentAdded( ) is invoked. When a component is removed from a container,
componentRemoved( ) is invoked. Their general forms are shown here:
void componentAdded(ContainerEvent ce)
void componentRemoved(ContainerEvent ce)
The FocusListener Interface
This interface defines two methods. When a component obtains keyboard focus, focusGained( )
is invoked. When a component loses keyboard focus, focusLost( ) is called. Their general
forms are shown here:
void focusGained(FocusEvent fe)
void focusLost(FocusEvent fe)
The ItemListener Interface
This interface defines the itemStateChanged( ) method that is invoked when the state of an
item changes. Its general form is shown here:
void itemStateChanged(ItemEvent ie)
The KeyListener Interface
This interface defines three methods. The keyPressed( ) and keyReleased( ) methods are
invoked when a key is pressed and released, respectively. The keyTyped( ) method is invoked
when a character has been entered.
For example, if a user presses and releases the A key, three events are generated in sequence:
key pressed, typed, and released. If a user presses and releases the HOME key, two key events
are generated in sequence: key pressed and released.
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