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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8"/>
<meta name="viewport" content="width=device-width, initial-scale=1.0"/>
<meta name="description" content="HashMap is a part of Java’s collection since Java 1.2. It provides the basic implementation of the Map interface of Java. It stores the data in (Key, Value) pairs. To access a value one must know its key. This class uses a technique called Hashing. Hashing is a technique of converting a large String to small String that represents the same String. A shorter value helps in indexing and faster searches. Let’s see how to create a map object using this class."/>
<meta name="keywords" content="Java HashMap ,hashmap,hashmap in java,about hashmap,use of hashmap,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><strong>Java HashMap</strong></h3>
<p><strong>In this tutorial, we will learn about the Java HashMap class and its methods with the help of examples.
</strong></p>
<p> The HashMap class of the Java collections framework provides the hash table implementation of the Map interface.
</p>
<p>HashMap is a part of Java’s collection since Java 1.2. It provides the basic implementation of the Map interface of Java. It stores the data in (Key, Value) pairs. To access a value one must know its key. This class uses a technique called Hashing. Hashing is a technique of converting a large String to small String that represents the same String. A shorter value helps in indexing and faster searches. Let’s see how to create a map object using this class.</p>
<h4><strong>Example</strong></h4>
<code><pre>// Java Program to illustrate the Hashmap Class
import java.util.*;
public class Codemistic {
public static void main(String[] args)
{
Map<String, Integer> map
= new HashMap< >();
map.put("ayush", 10);
map.put("anvi", 30);
map.put("pragya", 20);
for (Map.Entry<String, Integer> e : map.entrySet())
System.out.println(e.getKey() + " "
+ e.getValue());
}
}
<strong>output:</strong>
ayush 20
anvi 10
pragya 30
</pre></code>
<h4><strong>Important Features of HashMap
</strong></h4>
<p>Few important features of HashMap are:
</p>
<ul>
<li> HashMap is a part of java.util package.</li>
<li>HashMap extends an abstract class AbstractMap which also provides an incomplete implementation of Map interface.</li>
<li>It also implements Cloneable and Serializable interface. K and V in the above definition represent Key and Value respectively.</li>
<li>HashMap doesn’t allow duplicate keys but allows duplicate values. That means A single key can’t contain more than 1 value but more than 1 key can contain a single value.</li>
<li>HashMap allows null key also but only once and multiple null values.</li>
<li>This class makes no guarantees as to the order of the map; in particular, it does not guarantee that the order will remain constant over time. It is roughly similar to HashTable but is unsynchronized.</li>
</ul>
<h4><strong>Methods in HashMap</strong></h4>
<ol> <li><strong>void clear():</strong> Used to remove all mappings from a map.</li>
<li><strong>boolean containsKey(Object key):</strong> Used to return True if for a specified key, mapping is present in the map.</li>
<li><strong>boolean containsValue(Object value):</strong> Used to return true if one or more key is mapped to a specified value.</li>
<li><strong>Object clone():</strong> It is used to return a shallow copy of the mentioned hash map.</li>
<li><strong>boolean isEmpty(): </strong>Used to check whether the map is empty or not. Returns true if the map is empty.</li>
<li><strong>Set entrySet():</strong> It is used to return a set view of the hash map.</li>
<li><strong>Object get(Object key):</strong> It is used to retrieve or fetch the value mapped by a particular key.</li>
<li><strong>Set keySet():</strong> It is used to return a set view of the keys.</li>
<li><strong>int size():</strong> It is used to return the size of a map.</li>
<li><strong>Object put(Object key, Object value):</strong> It is used to insert a particular mapping of key-value pair into a map.</li>
<li><strong>putAll(Map M):</strong> It is used to copy all of the elements from one map into another.</li>
<li><strong>Object remove(Object key):</strong> It is used to remove the values for any particular key in the Map.</li>
<li><strong>Collection values():</strong> It is used to return a Collection view of the values in the HashMap.</li>
<li><strong>compute(K key, BiFunction<K, V> remappingFunction):</strong >This method Attempts to compute a mapping for the specified key and its current mapped value (or null if there is no current mapping).</li>
<li><strong>computeIfAbsent(K key, Function<K> mappingFunction): </strong>This method If the specified key is not already associated with a value (or is mapped to null), attempts to compute its value using the given mapping function and enters it into this map unless null.</li>
<li><strong>computeIfPresent(K key, BiFunction<K, V> remappingFunction):</strong>This method If the value for the specified key is present and non-null, attempts to compute a new mapping given the key and its current mapped value.</li>
<li><strong>forEach(BiConsumer<K, V> action): </strong>This method Performs the given action for each entry in this map until all entries have been processed or the action throws an exception.</li>
<li><strong>getOrDefault(Object key, V defaultValue):</strong> This method returns the value to which the specified key is mapped, or defaultValue if this map contains no mapping for the key.</li>
<li><strong>merge(K key, V value, BiFunction<K, V> remappingFunction):</strong> This method If the specified key is not already associated with a value or is associated with null, associates it with the given non-null value.</li>
<li><strong>putIfAbsent(K key, V value):</strong> This method If the specified key is not already associated with a value (or is mapped to null) associates it with the given value and returns null, else returns the current value.</li>
<li><strong>replace(K key, V value):</strong> This method replaces the entry for the specified key only if it is currently mapped to some value.</li>
<li><strong>replace(K key, V oldValue, V newValue):</strong> This method replaces the entry for the specified key only if currently mapped to the specified value.</li>
<li><strong>replaceAll(BiFunction<K, V> function):</strong> This method replaces each entry’s value with the result of invoking the given function on that entry until all entries have been processed or the function throws an exception.</li>
</ol>
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