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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=ForGeeks, 3=GeeksForGeeks}, key = 2Ou ...read more

Java-Collections

Java-Map-Programs

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 must override equals() for check ...read more

Java-Collections

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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 preserves the insertion order, it a...read more

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Technical Scripter 2018

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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

Java - util package

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 after declaration, that is, they ar ...read more

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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

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 the List can contain duplicate va...read more

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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 uses hash function to map similar ...read more

frequency-counting

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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 from this there are various differ ...read more

Java-Collections

Java-Map-Programs

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 the Value. Our task is to sort ...read more

Java-Collections

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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 advantages and disadvantages.First of al ...read more

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 through the keys. The most impo...read more

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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 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 a key and a value pairKey, Valu...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