Java-Map-Programs

21 posts

Difference Between ArrayList and HashMap in Java

Last Updated: 20 January 2022

ArrayList is a part of the collection framework and is present in java.util package. It provides us with dynamic arrays in Java. Though, it ...read more

Java

Technical Scripter

Java-Collections

Java-ArrayList

Java-HashMap

Technical Scripter 2018

Java-List-Programs

Java-Map-Programs

How to create a TreeMap in reverse order in Java

Last Updated: 25 October 2019

By default TreeMap elements in Java are sorted in ascending order of keys. However, we can create the TreeMap in reverse order using Collect ...read more

How to check if a key exists in a HashMap in Java

Last Updated: 11 December 2018

Given a HashMap and a key in Java, the task is to check if this key exists in the HashMap or not.Examples:Input: HashMap: {1=Geeks, 2=ForGee ...read more

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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

Program to Convert List to Map in Java

Last Updated: 19 June 2019

The List is a child interface of Collection. It is an ordered collection of objects in which duplicate values can be stored. Since List pres...read more

Technical Scripter 2018

Java-List-Programs

Java-Map-Programs

Immutable Map in Java

Last Updated: 03 March 2023

ImmutableMap, as suggested by the name, is a type of Map which is immutable. It means that the content of the map are fixed or constant afte ...read more

Conversion of Java Maps to List

Last Updated: 28 October 2021

A Map is an object that maps keys to values or is a collection of attribute-value pairs. The list is an ordered collection of objects and th...read more

Count occurrences of elements of list in Java

Last Updated: 31 May 2022

Suppose we have an elements in ArrayList, we can count the occurrences of elements present in a number of ways.HashMapThis data structure us ...read more

Difference between HashMap and ConcurrentHashMap

Last Updated: 06 August 2019

HashMap is the Class which is under Traditional Collection and ConcurrentHashMap is a Class which is under Concurrent Collections, apart fro ...read more

Sorting a HashMap according to keys in Java

Last Updated: 29 April 2021

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

How to iterate any Map in Java

Last Updated: 13 July 2023

There are generally five ways of iterating over a Map in Java. In this article, we will discuss all of them and also look at their advantage ...read more

Java

Java-Collections

Java-Map-Programs

Differences between TreeMap, HashMap and LinkedHashMap in Java

Last Updated: 20 July 2023

Prerequisite : HashMap and TreeMap in JavaTreeMap, HashMap and LinkedHashMap: What's Similar?All offer a key-value map and a way to iterate ...read more

Internal Working of HashMap in Java

Last Updated: 17 April 2024

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

HashMap and TreeMap in Java

Last Updated: 02 June 2023

HashMap and TreeMap are part of collection framework. HashMapjava.util.HashMap class is a Hashing based implementation. In HashMap, we have ...read more

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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