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How to Iterate HashMap in Java?

Last Updated: 16 October 2021

HashMap is a part of Java’s collection providing the basic implementation of the Map interface of Java by storing the data in (Key, Value) pairs to access them by an index ...read more

HashMap getOrDefault(key, defaultValue) method in Java with Examples

Last Updated: 15 October 2019

The getOrDefault(Object key, V defaultValue) method of Map interface, implemented by HashMap class is used to get the value mapped with specified key. If no value is mappe ...read more

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Traverse Through a HashMap in Java

Last Updated: 19 July 2022

HashMap stores the data in (Key, Value) pairs, and you can access them by an index of another type. HashMap class implements Map interface which allows us to store key. ha...read more

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Similar Topics

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Java program to count the occurrence of each character in a string using Hashmap

Last Updated: 01 December 2022

Given a string, the task is to write a program in Java which prints the number of occurrences of each character in a string.Examples:Input: str = "GeeksForGeeks"Output:r 1 ...read more

Sorting a Hashmap according to values

Last Updated: 06 April 2022

Given marks scored out of 100 by a student in subjects where the name of the subject is key and marks scored is the value. Our task is to sort the hashmap according to val ...read more

Java-Collections

java-LinkedList

Java-Map-Programs

HashMap containsKey() Method in Java

Last Updated: 02 June 2023

The java.util.HashMap.containsKey() method is used to check whether a particular key is being mapped into the HashMap or not. It takes the key element as a parameter and r ...read more

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Java - util package

HashMap entrySet() Method in Java

Last Updated: 26 November 2018

The java.util.HashMap.entrySet() method in Java is used to create a set out of the same elements contained in the hash map. It basically returns a set view of the hash map ...read more

Java-Collections

Java - util package

HashMap get() Method in Java

Last Updated: 11 January 2023

The java.util.HashMap.get() method of HashMap class is used to retrieve or fetch the value mapped by a particular key mentioned in the parameter. It returns NULL when the ...read more

Java-Collections

Java - util package

HashMap keySet() Method in Java

Last Updated: 26 November 2018

The java.util.HashMap.keySet() method in Java is used to create a set out of the key elements contained in the hash map. It basically returns a set view of the keys or we ...read more

Java-Collections

Java - util package

HashMap put() Method in Java

Last Updated: 02 June 2023

The java.util.HashMap.put() method of HashMap is used to insert a mapping into a map. This means we can insert a specific key and the value it is mapping to into a particu ...read more

Java-Collections

Java - util package

HashMap remove() Method in Java

Last Updated: 03 May 2021

The java.util.HashMap.remove() is an inbuilt method of HashMap class and is used to remove the mapping of any particular key from the map. It basically removes the values ...read more

Java-Collections

Java - util package

ConcurrentHashMap in Java

Last Updated: 22 February 2023

Prerequisites: ConcurrentMapThe ConcurrentHashMap class is introduced in JDK 1.5 belongs to java.util.concurrent package, which implements ConcurrentMap as well as to Seri...read more

Java-Collections

Java - util package

Java-ConcurrentHashMap

Internal Working of HashMap in Java

Last Updated: 05 January 2023

In this article, we will see how the hashmap get and put method works internally. What operations are performed? How the hashing is done. How the value is fetched by key. ...read more

Java-Map-Programs

HashMap in Java

Last Updated: 06 September 2023

In Java, HashMap is a part of Java's collection since Java 1.2. This class is found in java.util package. It provides the basic implementation of the Map interface of Java...read more

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Differences between HashMap and HashTable in Java

Last Updated: 23 January 2022

HashMap and Hashtable store key and value pairs in a hash table. When using a Hashtable or HashMap, we specify an object that is used as a key and the value that you want ...read more

Java-Map-Programs

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