java-hashset

79 posts

Last Updated: 12 March 2024

The Java Collection framework is a fundamental part of the Java programming language, It covers a major part of Java and acts as a prerequis...read more

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How to Sort HashSet Elements using Comparable Interface in Java?

Last Updated: 01 December 2021

The HashSet class implements the Set interface, backed by a hash table which is actually a HashMap instance. No guarantee is made as to the ...read more

How to Preserve Insertion Order of Java HashSet Elements?

Last Updated: 07 January 2021

When elements get from the HashSet due to hashing the order they inserted is not maintained while retrieval. HashSet stores the elements by ...read more

Technical Scripter 2020

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How to Get Random Elements from Java HashSet?

Last Updated: 07 January 2021

Unlike List classes, the HashSet class does not provide any methods using which we can get the elements using their index. It makes it diffi ...read more

Technical Scripter 2020

How to Find the Minimum and Maximum Value from Java HashSet?

Last Updated: 28 December 2020

HashSet is used to store distinct values in Java. The HashSet does not guarantee the constant order of elements over time, which means when ...read more

How to Convert Comma Separated String to HashSet in Java?

Last Updated: 17 December 2020

Given a Set of String, the task is to convert the Set to a comma-separated String in Java.Examples:Input: SetString = ["Geeks", "ForGeeks", ...read more

Technical Scripter 2020

Java Program to Get First or Last Elements from HashSet

Last Updated: 05 September 2023

The HashSet class implements the Set interface, backed by a hash table which is actually a HashMap instance. There is no guarantee made for ...read more

Convert HashSet to TreeSet in Java

Last Updated: 03 January 2019

Hashset: Hashset in Java is generally used for operations like search, insert and delete. It takes constant time for these operations on ave ...read more

HashSet equals() method in Java with Example

Last Updated: 19 February 2020

The equals() method of java.util.HashSet class is used verify the equality of an Object with a HashSet and compare them. The list returns t ...read more

HashSet toArray() method in Java with Example

Last Updated: 24 December 2018

The toArray() method of Java HashSet is used to form an array of the same elements as that of the HashSet. Basically, it copies all the elem ...read more

HashSet retainAll() method in Java with Example

Last Updated: 24 December 2018

The retainAll() method of java.util.HashSet class is used to retain from this set all of its elements that are contained in the specified co ...read more

Java HashSet clear() Method

Last Updated: 22 January 2025

The clear() method of the HashSet class in Java is used to clear all the elements from the HahSet. This method makes the HashSet empty but d ...read more

Java

Java-Collections

java-hashset

Java HashSet clone() Method

Last Updated: 23 January 2025

The HashSet clone() method in Java is used to return a shallow copy of the given HashSet. It just creates a copy of the set.Syntax of HashSe ...read more

Java

Java-Collections

java-hashset

Check if array contains contiguous integers with duplicates allowed

Last Updated: 21 May 2024

Given an array of n integers(duplicates allowed). Print "Yes" if it is a set of contiguous integers else print "No".Examples:Input : arr[] = ...read more

Importance of hashCode() Method in Java

Last Updated: 06 May 2025

In Java, the hashCode() method tells how objects are stored and compared when we work with collections like HashMap, HashSet, and HashTable. ...read more

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