java.util.Observer Maven / Gradle / Ivy
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* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
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*/
package java.util;
/**
* {@code Observer} is the interface to be implemented by objects that
* receive notification of updates on an {@code Observable} object.
*
* @see Observable
*/
public interface Observer {
/**
* This method is called if the specified {@code Observable} object's
* {@code notifyObservers} method is called (because the {@code Observable}
* object has been updated.
*
* @param observable
* the {@link Observable} object.
* @param data
* the data passed to {@link Observable#notifyObservers(Object)}.
*/
void update(Observable observable, Object data);
}