FocusListener
EventListener
public class BasicSliderUI.FocusHandler extends Object implements FocusListener
该类应被视为“受保护”的内部类。 仅在Foo子类中实例化它。
Foo
FocusHandler()
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
focusGained, focusLost
public FocusHandler()