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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
 *  limitations under the License.
 */

package java.util;

/**
 * Note: Do not use this class since it is obsolete. Please use the
 * {@link Map} interface for new implementations.
 * 

* Dictionary is an abstract class which is the superclass of all classes that * associate keys with values, such as {@code Hashtable}. * * @see Hashtable * @since 1.0 */ public abstract class Dictionary { /** * Constructs a new instance of this class. */ public Dictionary() { } /** * Returns an enumeration on the elements of this dictionary. * * @return an enumeration of the values of this dictionary. * @see #keys * @see #size * @see Enumeration */ public abstract Enumeration elements(); /** * Returns the value which is associated with {@code key}. * * @param key * the key of the value returned. * @return the value associated with {@code key}, or {@code null} if the * specified key does not exist. * @see #put */ public abstract V get(Object key); /** * Returns true if this dictionary has no key/value pairs. * * @return {@code true} if this dictionary has no key/value pairs, * {@code false} otherwise. * @see #size */ public abstract boolean isEmpty(); /** * Returns an enumeration on the keys of this dictionary. * * @return an enumeration of the keys of this dictionary. * @see #elements * @see #size * @see Enumeration */ public abstract Enumeration keys(); /** * Associate {@code key} with {@code value} in this dictionary. If {@code * key} exists in the dictionary before this call, the old value in the * dictionary is replaced by {@code value}. * * @param key * the key to add. * @param value * the value to add. * @return the old value previously associated with {@code key} or {@code * null} if {@code key} is new to the dictionary. * @see #elements * @see #get * @see #keys */ public abstract V put(K key, V value); /** * Removes the key/value pair with the specified {@code key} from this * dictionary. * * @param key * the key to remove. * @return the associated value before the deletion or {@code null} if * {@code key} was not known to this dictionary. * @see #get * @see #put */ public abstract V remove(Object key); /** * Returns the number of key/value pairs in this dictionary. * * @return the number of key/value pairs in this dictionary. * @see #elements * @see #keys */ public abstract int size(); }





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