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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

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 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

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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 <code>ContainerAdapter</code> 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</code>

 * 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</code> 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="https://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.

     */

    public void componentAdded(ContainerEvent e);

    /**

     * Invoked when a component has been removed from the container.

     */

    public void componentRemoved(ContainerEvent e);

}