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21 posts

Map size() Method in Java With Examples

Last Updated: 15 July 2025

Map size() method in Java is used to get the total number entries i.e, key-value pair. So this method is useful when you want total entries present on the map. If the map ...read more

Java-Collections

Java-Map-Programs

How to find the Entry with largest Key in a Java Map

Last Updated: 12 July 2025

Given a map in Java, the task is to find out the entry in this map with the highest key. Examples:Input: Map = {ABC = 10, DEF = 30, XYZ = 20}Output: XYZ = 20Input: Map = {...read more

Java-Map-Programs

How to Clone a Map in Java

Last Updated: 11 July 2025

Given a map, the task is to clone that map.Following are the 5 different ways to Clone a Map in Java.Example:{1=Geeks, 2=For, 3=Geeks} Method 1: Naive method1. Create a...read more

Java-Map-Programs

Difference Between ArrayList and HashMap in Java

Last Updated: 11 July 2025

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 may be slower than standard arr...read more

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Technical Scripter

Technical Scripter 2018

Java-Collections

Java-List-Programs

Java-Map-Programs

How to create a TreeMap in reverse order in Java

Last Updated: 11 July 2025

By default TreeMap elements in Java are sorted in ascending order of keys. However, we can create the TreeMap in reverse order using Collections.reverseOrder() method in J...read more

Java-Collections

Java-Map-Programs

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: 11 July 2025

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

Technical Scripter

Difference Between

Java-Collections

Java-Map-Programs

Java-Set-Programs

Sort elements by frequency | Set 5 (using Java Map)

Last Updated: 11 July 2025

Given an integer array, sort the array according to the frequency of elements in decreasing order, if the frequency of two elements are same then sort in increasing orderE...read more

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Technical Scripter 2018

Java-Map-Programs

Program to Convert List to Map in Java

Last Updated: 11 July 2025

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

Technical Scripter 2018

Java-Collections

Java-List-Programs

Java-Map-Programs

Using TreeMap to sort User-defined Objects in Java

Last Updated: 11 July 2025

Given example shows how to sort user defined objects TreeMap, you can sort the keys based on the logic provided inside the method.Given a record of employees name and sala...read more

Java-Map-Programs

Program to Convert HashMap to TreeMap in Java

Last Updated: 11 July 2025

HashMap is a part of Java’s collection since Java 1.2. It provides the basic implementation of Map interface of Java which stores the data in (Key, Value) pairs. To access...read more

Java - util package

Java-Map-Programs

Immutable Map in Java

Last Updated: 11 July 2025

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

Java-Collections

Java - util package

Java-Map-Programs

Conversion of Java Map to List

Last Updated: 11 July 2025

In Java, a Map is a collection that maps keys to values and a list is an ordered collection of objects and the List can contain duplicate values.There are some scenarios w...read more

Java-Collections

Java-List-Programs

Java-Map-Programs

Count occurrences of elements of list in Java

Last Updated: 11 July 2025

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

Technical Scripter

frequency-counting

Java-List-Programs

Java-Map-Programs

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