--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/java.base/share/classes/java/util/Dictionary.java Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,155 @@
+/*
+ * Copyright (c) 1995, 2004, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * 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.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package java.util;
+
+/**
+ * The {@code Dictionary} class is the abstract parent of any
+ * class, such as {@code Hashtable}, which maps keys to values.
+ * Every key and every value is an object. In any one {@code Dictionary}
+ * object, every key is associated with at most one value. Given a
+ * {@code Dictionary} and a key, the associated element can be looked up.
+ * Any non-{@code null} object can be used as a key and as a value.
+ * <p>
+ * As a rule, the {@code equals} method should be used by
+ * implementations of this class to decide if two keys are the same.
+ * <p>
+ * <strong>NOTE: This class is obsolete. New implementations should
+ * implement the Map interface, rather than extending this class.</strong>
+ *
+ * @author unascribed
+ * @see java.util.Map
+ * @see java.lang.Object#equals(java.lang.Object)
+ * @see java.lang.Object#hashCode()
+ * @see java.util.Hashtable
+ * @since 1.0
+ */
+public abstract
+class Dictionary<K,V> {
+ /**
+ * Sole constructor. (For invocation by subclass constructors, typically
+ * implicit.)
+ */
+ public Dictionary() {
+ }
+
+ /**
+ * Returns the number of entries (distinct keys) in this dictionary.
+ *
+ * @return the number of keys in this dictionary.
+ */
+ public abstract int size();
+
+ /**
+ * Tests if this dictionary maps no keys to value. The general contract
+ * for the {@code isEmpty} method is that the result is true if and only
+ * if this dictionary contains no entries.
+ *
+ * @return {@code true} if this dictionary maps no keys to values;
+ * {@code false} otherwise.
+ */
+ public abstract boolean isEmpty();
+
+ /**
+ * Returns an enumeration of the keys in this dictionary. The general
+ * contract for the keys method is that an {@code Enumeration} object
+ * is returned that will generate all the keys for which this dictionary
+ * contains entries.
+ *
+ * @return an enumeration of the keys in this dictionary.
+ * @see java.util.Dictionary#elements()
+ * @see java.util.Enumeration
+ */
+ public abstract Enumeration<K> keys();
+
+ /**
+ * Returns an enumeration of the values in this dictionary. The general
+ * contract for the {@code elements} method is that an
+ * {@code Enumeration} is returned that will generate all the elements
+ * contained in entries in this dictionary.
+ *
+ * @return an enumeration of the values in this dictionary.
+ * @see java.util.Dictionary#keys()
+ * @see java.util.Enumeration
+ */
+ public abstract Enumeration<V> elements();
+
+ /**
+ * Returns the value to which the key is mapped in this dictionary.
+ * The general contract for the {@code isEmpty} method is that if this
+ * dictionary contains an entry for the specified key, the associated
+ * value is returned; otherwise, {@code null} is returned.
+ *
+ * @return the value to which the key is mapped in this dictionary;
+ * @param key a key in this dictionary.
+ * {@code null} if the key is not mapped to any value in
+ * this dictionary.
+ * @exception NullPointerException if the {@code key} is {@code null}.
+ * @see java.util.Dictionary#put(java.lang.Object, java.lang.Object)
+ */
+ public abstract V get(Object key);
+
+ /**
+ * Maps the specified {@code key} to the specified
+ * {@code value} in this dictionary. Neither the key nor the
+ * value can be {@code null}.
+ * <p>
+ * If this dictionary already contains an entry for the specified
+ * {@code key}, the value already in this dictionary for that
+ * {@code key} is returned, after modifying the entry to contain the
+ * new element. <p>If this dictionary does not already have an entry
+ * for the specified {@code key}, an entry is created for the
+ * specified {@code key} and {@code value}, and {@code null} is
+ * returned.
+ * <p>
+ * The {@code value} can be retrieved by calling the
+ * {@code get} method with a {@code key} that is equal to
+ * the original {@code key}.
+ *
+ * @param key the hashtable key.
+ * @param value the value.
+ * @return the previous value to which the {@code key} was mapped
+ * in this dictionary, or {@code null} if the key did not
+ * have a previous mapping.
+ * @exception NullPointerException if the {@code key} or
+ * {@code value} is {@code null}.
+ * @see java.lang.Object#equals(java.lang.Object)
+ * @see java.util.Dictionary#get(java.lang.Object)
+ */
+ public abstract V put(K key, V value);
+
+ /**
+ * Removes the {@code key} (and its corresponding
+ * {@code value}) from this dictionary. This method does nothing
+ * if the {@code key} is not in this dictionary.
+ *
+ * @param key the key that needs to be removed.
+ * @return the value to which the {@code key} had been mapped in this
+ * dictionary, or {@code null} if the key did not have a
+ * mapping.
+ * @exception NullPointerException if {@code key} is {@code null}.
+ */
+ public abstract V remove(Object key);
+}