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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) ...read more

Java HashMap getOrDefault() Method

Last Updated: 07 April 2025

When we work with Java's HashMap, one common problem occurs that is dealing with missing keys. If we try to fetch a value for a key that doe ...read more

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Java - util package

Difference between HashMap and HashSet

Last Updated: 06 April 2023

HashSet is an implementation of Set Interface which does not allow duplicate value. The main thing is, objects that are stored in HashSet mu ...read more

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Hashing in Java

Last Updated: 01 March 2023

In hashing there is a hash function that maps keys to some values. But these hashing function may lead to collision that is two or more keys...read more

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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: ...read more

HashMap containsKey() Method in Java

Last Updated: 04 January 2025

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 k ...read more

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Java - util package

HashMap entrySet() Method in Java

Last Updated: 13 December 2024

The entrySet() method of the HashMap class in Java is used to create a set view of the mappings contained in the HashMap. This method allows ...read more

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HashMap get() Method in Java

Last Updated: 04 January 2025

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 param ...read more

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Java HashMap keySet() Method

Last Updated: 16 January 2025

The keySet() method of the Java HashMap class is used to return a set containing all the keys in the map. This set is backed by the HashMap, ...read more

Java-Collections

Java HashMap put() Method

Last Updated: 20 January 2025

The put() method of the Java HashMap class is used to add or update the key-value pairs in the map. If the key already exists in the map, th ...read more

Java-Collections

Java HashMap remove() Method

Last Updated: 20 January 2025

The remove() method of the Java HashMap class is used to remove a key-value pair from the map based on the given key. If the key is found, t...read more

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Sorting a HashMap according to keys in Java

Last Updated: 14 April 2025

We are given the details of marks scored by students in form of a HashMap, where the name of the student is the Key and the marks scored is ...read more

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Internal Working of HashMap in Java

Last Updated: 22 April 2025

In this article, we will understand the internal workings of the HashMap in Java, also how the get() and put() method functions, how hashing...read more

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HashMap in Java

Last Updated: 07 March 2025

In Java, HashMap is part of the Java Collections Framework and is found in the java.util package. It provides the basic implementation of th...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 k ...read more

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