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package java.awt.event;
import java.util.EventListener;
/**
* The listener interface for receiving container events.
* The class that is interested in processing a container event
* either implements this interface (and all the methods it
* contains) or extends the abstract ContainerAdapter
class
* (overriding only the methods of interest).
* The listener object created from that class is then registered with a
* component using the component's addContainerListener
* method. When the container's contents change because a component
* has been added or removed, the relevant method in the listener object
* is invoked, and the ContainerEvent
is passed to it.
*
* Container events are provided for notification purposes ONLY; * The AWT will automatically handle add and remove operations * internally so the program works properly regardless of * whether the program registers a {@code ContainerListener} or not. * * @see ContainerAdapter * @see ContainerEvent * @see Tutorial: Writing a Container Listener * * @author Tim Prinzing * @author Amy Fowler * @since 1.1 */ public interface ContainerListener extends EventListener { /** * Invoked when a component has been added to the container. */ public void componentAdded(ContainerEvent e); /** * Invoked when a component has been removed from the container. */ public void componentRemoved(ContainerEvent e); }