Java- Find the index of the two numbers in the array whose sum is equal to a given number

Sometimes interviewer wants to check the candidate’s logical ability and the approach taken to solve the challenge/problem using Java. Question:  […]

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How to create custom Scrollbar in CSS

Using CSS properties, you can customize the scrollbar of your website. This short article will explain, how to create a […] Continue reading »

Eclipse/STS – Optimize/Remove unused imports shortcut keys

Ctrl + Shift + O is the shortcut key to optimize or remove the unused import from your code in […] Continue reading »

IntelliJ IDEA– Remove/Optimize unused imports shortcut keys

In IntelliJ IDEA, Ctrl + Alt + O is the shortcut keys to remove/optimize unused imports for Windows/Linux operating system, […] Continue reading »

Different ways to iterate/loop a List of Integers in Java

In Java, you can iterate or loop a List object in different ways. In this short example, you will find […] Continue reading »

Java- Find the element in the List having maximum value

In Java 8, Stream API’s max method returns the maximum element of this stream according to the provided Comparator and […] Continue reading »

Java- Find all Capital Letters in the String

In this short tutorial, we’ll find all the capital letters in the given String using Java. Character.isUpperCase(char ch) returns true […] Continue reading »

IntelliJ IDEA – Find file containing text shortcut

In IntelliJ IDEA, Ctrl + Shift + F is the shortcut key to find the file containing any text like […] Continue reading »

Spring Boot Cookies Example

In this article, we’ll explore how to use cookies in the Spring Boot application. A cookie is a small piece […] Continue reading »


In MongoDB database, db.collection.update({criteria},{$operator: {new value}}) or db.collection.updateMany({criteria},{$operator: {new value}}) method is used to ADD, DELETE, or MODIFY/RENAME the existing […] Continue reading »


This page will help you to perform the basic query/operation with the MongoDB database like SELECT, INSERT, UPDATE, and DELETE. […] Continue reading »

How to set Username, Password, and Roles to MongoDB Database

In this guide, we’ll show you how to set username, password, and roles to the MongoDB database. MongoDB database instance […] Continue reading »

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