Contributions

Tutorial
Java LinkedHashMap is a hash table and doubly linked List based implementation of Java's Map interface. It extends the HashMap class which is another very commonly used implementation of the Map interface.
Tutorial
A Queue is a First In First Out (FIFO) data structure. It models a queue in real-life. Yes, the one that you might have seen in front of a movie theater, a shopping mall, a metro, or a bus. Just like queues in real life, new elements in a Queue data structure are added at the back and removed from the front.
Tutorial
Java TreeMap is a Red-Black tree based implementation of Java's Map interface. The TreeMap class is part of Java's collection framework. It implements the NavigableMap interface, which in turn extends the SortedMap interface.
Tutorial
Java HashSet class is a member of Java collections framework. It implements the Set interface. HashSets are used to store a collection of unique elements.
Tutorial
ArrayList in Java is used to store dynamically sized collection of elements. Contrary to Arrays that are fixed in size, an ArrayList grows its size automatically when new elements are added to it. ArrayList is part of Java's collection framework and implements Java's List interface.
Tutorial
Java HashMap is a hash table based implementation of Java's Map interface. A Map, as you might know, is a collection of key-value pairs. It maps keys to values.
Tutorial
Learn how to create and write to an excel file or modify an existing excel file using Apache POI library.
Tutorial
Learn how to read excel files in Java using Apache POI library. Apache POI is a very simple yet powerful open source library for working with Microsoft office files.
Article
Learn how to map Embeddable types in hibernate using @Embeddable and @Embedded annotation. Embeddable types help you abstract out common stuff into separate embeddable classes that can be embedded by other entities.
Article
In this article, you’ll learn how to map a one to many bidirectional relationship using Hibernate, Spring Boot and JPA.
Article
In this article, you’ll learn how to map a one to one bidirectional relationship using Hibernate, Spring Boot and JPA.
Article
In this article, you’ll learn how to Read and Parse CSV files in Java using Apache Commons CSV. You’ll also use Apache Commons CSV library to Generate CSV files in Java.
Article
QR Code or Quick Response Code is a two-dimensional barcode that can be read by modern smartphones and special QR Code scanner devices.
If you wanted to know how QR Codes work and how to generate one for your next exciting project, then this blog post is for you.
Tutorial
WebClient is a non-blocking, reactive HTTP client with a fluent functional style API. It is part of Spring WebFlux module that was introduced in Spring 5. In this article, you’ll learn how to use WebClient and WebTestClient to consume and test REST APIs.
Tutorial
In this tutorial, you’ll learn how to Read and Parse CSV files in Java using OpenCSV library. You’ll also use OpenCSV library to Generate a CSV file in Java.
Article
Java 9 has introduced static factory methods in the List, Set and Map interfaces of the Collections API for creating immutable Collections. In this article, you’ll learn about these new methods, their usage, and implementation details.