Set study------MAP

/* * 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 are not a use of this file except in compliance with * the License. Obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * unless required by Applica BLE law or agreed into writing, software * Distributed under the License is distributed on a "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;/** * A {@code Map} is a data structure consisting of a set of keys and values * with which each key is  Mapped to a single value. The class of the objects * used as keys are declared when The {@code Map} is declared, as is the * class of the corresponding values. * <p> * A {@code Map} provides helper methods to iterate through all of the ' keys contained in it, as well as Vario US methods to access and update * The Key/value pairs.     */public interface Map<k,v> {/** * {@code map.entry} is a key/value mapping contained in a {@code Map}. */public static interface Entry<k,v> {/** * compares the specified object to this {@code map.en Try} and returns if they * is equal.         To be equal, the object must is an instance of {@code Map.entry} and has the * same key and value.         * * @param Object * The {@code object} to compare with this {@code object}.  * @return {@code true} if the specified {@code Object} is equal to this * {@code map.entry}, {@code false}         otherwise.        * @see #hashCode () */public Boolean equals (Object object);   /**      * Returns the key.        * * @return The key */public K getKey ();         /** * Returns the value.        * * @return The value */public V getValue (); /** * Returns An integer hash code for the receiver.         {@code Object} which is * equal return the same value for this method.         * * @return The receiver ' s hash code.        * @see #equals (Object) */public int hashcode ();         /** * Sets the value of this entry to the specified value, replacing any * existing value.         * * @param Object * The new value to set.         * @return Object The replaced value of this entry.    */Public v SetValue (v object);    };     /** * Removes all elements from this {@code Map}, leaving it empty. * * @throws unsupportedoperationexception * If removing elements from this {@code Map} are not Suppo  RTed.   * @see #isEmpty () * @see #size () */public void clear ();     /** * Returns Whether this {@code Map} contains the specified key.     * * @param key * The key to search for.     * @return {@code true} if this map contains the specified key, * {@code false} otherwise.    */Public Boolean containskey (Object key);     /** * Returns Whether this {@code Map} contains the specified value.     * * @param value * The value to search for.     * @return {@code true} if this map contains the specified value, * {@code false} otherwise.    */Public Boolean containsvalue (Object value); /** * Returns a {@code Set} containing all of the mappings in this {@code Map}. Each mapping are * An instance of {@link map.entry}.     As the {@code Set} is backed by this {@code Map}, * Changes in one would be reflected in the other. * * @return A set of the mappings */public Set<map.entry<k,v>> EntrySet (); /** * Compares the argument to the receiver, and returns {@code true} if the * specified object is a {@code Map} A     nd both {@code map}s contain the same mappings.     * * @param Object * The {@code object} to compare with this {@code object}. * @return Boolean {@code true} if the {@code Object} is the same as this {@code Object} * {@code false} if it     is different from this {@code Object}.    * @see #hashCode () * @see #entrySet () */public Boolean equals (Object object);     /** * Returns The value of the mapping with the specified key.     * * @param key * the key. * @return The value of the mapping with the specified key, or {@code null} * If no mapping for the specified k     EY is found.    */Public V get (Object key); /** * Returns An integer hash code for the receiver.     {@code object}s which is equal * return the same value for this method. * * @returnThe receiver ' s hash.    * @see #equals (Object) */public int hashcode ();     /** * Returns Whether this map is empty.     * * @return {@code true} if this map has no elements, {@code false} * otherwise.    * @see #size () */public Boolean isEmpty (); /** * Returns A set of the keys contained in this {@code Map}. The {@code Set} is backed by * This {@code Map} so changes to one was reflected by the other.     The {@code Set} does not * support adding.     * * @return A set of the keys.    */Public set<k> keySet ();     /** * Maps The specified key to the specified value.     * * @param key * the key.     * @param value * the value. * @return The value of any previous mapping with the specified key or * {@code null} If there is no mapping.     That is, return the value of the old (you are going to replace), if there is no such key, the return is null. * @throws Unsupportedoperationexception * If adding to this {@code Map} isNot supported.                * @throws ClassCastException * If the class of the key or value is inappropriate for *     This {@code Map}.     * @throws IllegalArgumentException * If the key or value cannot is added to this {@code Map}.                * @throws NullPointerException * If the key or value is {@code null} and this {@code Map} does * Not support {@code null} keys or values.

     * */Public V put (K key, v value);     /** * Copies Every mapping in the specified {@code map} to this {@code map}.     * * @param map * The {@code map} to copy mappings from.     * @throws Unsupportedoperationexception * If adding to this {@code Map} are not supported.                * @throws ClassCastException * If the class of a key or a value of the specified {@code Map} is *     Inappropriate for this {@code Map}.     * @throws IllegalArgumentException * If a key or value cannot is added to this {@code Map}.                * @throws NullPointerException * If a key or value is {@code null} and this {@code Map} does not *     Support {@code null} keys or values.    */public void Putall (map<? extends K,? extends v> Map);     /** * Removes a mapping with the specified key from this {@code Map}. * * @param key * The key of the mapPing to remove.     * @return The value of the removed mapping or {@code null} if no mapping * for the specified key is found.     * @throws unsupportedoperationexception * If removing from this {@code Map} are not supported.    */Public V Remove (Object key);     /** * Returns The number of mappings in this {@code Map}.     * * @return The number of mappings in this {@code Map}.    */public int size (); /** * Returns a {@code Collection} of the values contained in this {@code Map}. The {@code Collection} * is backed by this {@code Map} so changes to one was reflected by the other. The * {@code Collection} supports {@link collection#remove}, {@link Collection#removeall}, * {@link Collection#ret Ainall}, and {@link collection#clear} operations, * and it does not support {@link Collection#add} or {@link Collectio     N#addall} operations. * <p> * This method returns a {@code Collection} which is the subclass of    * {@link abstractcollection}.  The {@link Abstractcollection#iterator} method of this subclass returns a * ' wrapper object ' over the iterator of this {@code Map} ' s {@link #entrySet ()}. The {@link Abstractcollection#size} method * Wraps this {@code Map} ' s {@link #size} method and the {@link Abstractcoll     Ection#contains} method wraps this {@code Map} ' s * {@link #containsValue} method.  * <p> * The collection is created if this method was called at first time and * returned in response Subsequent calls. This method could return * different Collection when multiple calls to the This method, since it have no * synchronizatio     N performed.     * * @return A collection of the values contained in this map. */Public collection<v> values ();}

Set study------MAP