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<!DOCTYPE html>
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<meta name="description" content="A map contains values on the basis of key, i.e. key and value pair. Each key and value pair is known as an entry. A Map contains unique keys. A Map is useful if you have to search, update or delete elements on the basis of a key."/>
<meta name="keywords" content="Java map interface ,map,map interface in java,about map,use of map interface,data structure,C, C++, Python, Java, HTML, CSS, JavaScript, SQL, PHP, jQuery, XML, DOM, Bootstrap, Tutorials, Articles, Programming, training, learning, quiz, preferences, examples, code"/>
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<h3>Java Map Interface</h3>
<p><strong>In this tutorial, we will learn about the Java Map interface and its methods.
</strong></p>
<p>A map contains values on the basis of key, i.e. key and value pair. Each key and value pair is known as an entry. A Map contains unique keys.<br>
A Map is useful if you have to search, update or delete elements on the basis of a key.</p>
<p><strong>Working of Map</strong></p>
<p> In Java, elements of Map are stored in key/value pairs. Keys are unique values associated with individual Values.
A map cannot contain duplicate keys. And, each key is associated with a single value.
</p>
<ul>Note: The Map interface maintains 3 different sets:
<li>the set of keys
</li>
<li>the set of values
</li>
<li>the set of key/value associations (mapping).
</li>
</ul>
<h4><strong>Classes that implement Map
</strong></h4>
<ul>
In order to use functionalities of the Map interface, we can use these classes:
<li>HashMap</li>
<li>EnumMap</li>
<li>LinkedHashMap</li>
<li>WeakHashMap</li>
<li>TreeMap</li>
</ul>
<img src="javaphoto/java-map-implementation.png" alt="map interface">
<h4><strong>Methods of Map
</strong></h4>
<table class="table table-bordered">
<tbody><tr>
<th>Sr.No.</th>
<th style="text-align:center;">Method & Description</th>
</tr>
<tr>
<td class="ts">1</td>
<td><p><b>void clear( )</b></p>
<p>Removes all key/value pairs from the invoking map.</p>
</td>
</tr>
<tr>
<td class="ts">2</td>
<td><p><b>boolean containsKey(Object k)</b></p>
<p>Returns true if the invoking map contains <b>k</b> as a key. Otherwise, returns false.</p>
</td>
</tr>
<tr>
<td class="ts">3</td>
<td><p><b>boolean containsValue(Object v)</b></p>
<p>Returns true if the map contains <b>v</b> as a value. Otherwise, returns false.</p>
</td>
</tr>
<tr>
<td class="ts">4</td>
<td><p><b>Set entrySet( )</b></p>
<p>Returns a Set that contains the entries in the map. The set contains objects of type Map.Entry. This method provides a set-view
of the invoking map.</p>
</td>
</tr>
<tr>
<td class="ts">5</td>
<td><p><b>boolean equals(Object obj)</b></p>
<p>Returns true if obj is a Map and contains the same entries. Otherwise, returns false.</p>
</td>
</tr>
<tr>
<td class="ts">6</td>
<td><p><b>Object get(Object k)</b></p>
<p>Returns the value associated with the key <b>k</b>.</p>
</td>
</tr>
<tr>
<td class="ts">7</td>
<td><p><b>int hashCode( )</b></p>
<p>Returns the hash code for the invoking map.</p>
</td>
</tr>
<tr>
<td class="ts">8</td>
<td><p><b>boolean isEmpty( )</b></p>
<p>Returns true if the invoking map is empty. Otherwise, returns false.</p>
</td>
</tr>
<tr>
<td class="ts">9</td>
<td><p><b>Set keySet( )</b></p>
<p>Returns a Set that contains the keys in the invoking map. This method provides a set-view of the keys in the invoking map.</p>
</td>
</tr>
<tr>
<td class="ts">10</td>
<td><p><b>Object put(Object k, Object v)</b></p>
<p>Puts an entry in the invoking map, overwriting any previous value associated with the key. The key and value are k and v, respectively. Returns null if the key did not already exist. Otherwise, the previous value linked to the key is returned.</p>
</td>
</tr>
<tr>
<td class="ts">11</td>
<td><p><b>void putAll(Map m)</b></p>
<p>Puts all the entries from <b>m</b> into this map.</p>
</td>
</tr>
<tr>
<td class="ts">12</td>
<td><p><b>Object remove(Object k)</b></p>
<p>Removes the entry whose key equals <b>k</b>.</p>
</td>
</tr>
<tr>
<td class="ts">13</td>
<td><p><b>int size( )</b></p>
<p>Returns the number of key/value pairs in the map.</p>
</td>
</tr>
<tr>
<td class="ts">14</td>
<td><p><b>Collection values( )</b></p>
<p>Returns a collection containing the values in the map. This method provides a collection-view of the values in the map.</p>
</td>
</tr>
</tbody></table>
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