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Popular articles

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Internal Working of TreeMap in Java

Last Updated: 05 July 2021

TreeMap class is like HashMap. TreeMap stores key-value pairs. The main difference is that TreeMap sorts the key in ascending order. TreeMap is sorted as the ordering of i...read more

Java-Collections

How to Get TreeMap Key or Value using Index in Java?

Last Updated: 23 July 2021

The TreeMap in Java is used to implement the Map interface and NavigableMap along with the AbstractMap Class. The TreeMap is sorted according to the natural ordering of it ...read more

How to Sort a TreeMap By Value in Java?

Last Updated: 17 December 2020

In Java Language, a TreeMap always stores key-value pairs which are in sorted order on the basis of the key. TreeMap implements the NavigableMap interface and extends Abst ...read more

Similar Topics

DSA

21k+ articles

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1.7k+ articles

Java-Collections

1.1k+ articles

Java-HashMap

140+ articles

java-treeset

60+ articles

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60+ articles

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30+ articles

How to iterate over a TreeMap in Java?

Last Updated: 07 December 2022

Given a TreeMap, the task is to iterate this TreeMap in Java. The TreeMap in Java is used to implement Map interface and NavigableMap along with the Abstract Class. We can ...read more

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 Collections.reverseOrder() method in J ...read more

Java-Collections

Java-Map-Programs

TreeMap comparator() method in Java with Examples

Last Updated: 22 November 2021

The comparator() method of java.util.TreeMap class is used to return the comparator used to order the keys in this map, or null if this map uses the natural ordering of it ...read more

Java-Collections

Java - util package

Program to Convert HashMap to TreeMap in Java

Last Updated: 01 October 2021

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

TreeMap floorKey() in Java with Examples

Last Updated: 17 September 2018

Pre-requisite: TreeMap in JavaThe floorKey() method is used to return the greatest key less than or equal to given key from the parameter.Syntax:public K floorKey(K key)Pa ...read more

Java - util package

Java Lambda Expression with Collections

Last Updated: 23 August 2022

In this article, Lambda Expression with Collections is discussed with examples of sorting different collections like ArrayList, TreeSet, TreeMap, etc. Sorting Collections ...read more

Java-Collections

Java-List-Programs

TreeMap put() Method in Java

Last Updated: 10 July 2018

The java.util.TreeMap.put() method of TreeMap 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

TreeMap get() Method in Java

Last Updated: 28 June 2018

The java.util.TreeMap.get() method of TreeMap 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

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

Java-List-Programs

Java-Map-Programs

Print number of words, vowels and frequency of each character

Last Updated: 27 July 2022

Given a string str with uppercase, lowercase and special characters. The input string is to end with either a space or a dot. The problem is to calculate the number of wor ...read more

Java-String-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

Java-Collections

Difference Between

Java-LinkedHashMap

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

Java-Collections

Java-Map-Programs