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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 ContainerListener or not. 
Author:
Tim Prinzing, Amy Fowler
See Also:
ContainerAdapter
ContainerEvent
Tutorial: Writing a Container Listener
Since:
1.1/**
 * 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 {@code 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 {@code 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 {@code ContainerEvent} is passed to it.
 * <P>
 * 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 <a href="http://docs.oracle.com/javase/tutorial/uiswing/events/containerlistener.html">Tutorial: Writing a Container Listener</a>
 *
 * @author Tim Prinzing
 * @author Amy Fowler
 * @since 1.1
 */
public interface ContainerListener extends EventListener {
    
Invoked when a component has been added to the container.
Params:
e – the event to be processed/**
     * Invoked when a component has been added to the container.
     * @param e the event to be processed
     */
    public void componentAdded(ContainerEvent e);

    
Invoked when a component has been removed from the container.
Params:
e – the event to be processed/**
     * Invoked when a component has been removed from the container.
     * @param e the event to be processed
     */
    public void componentRemoved(ContainerEvent e);

}