Learn about reversing a linked list in Java 1. Overview In this article, we’re going to learn the different ways to reverse a linked list. 2. Description Given the head of a linked list, reverse the list, and return the reversed list. Example 1: Input: 1->2->3->4->5->NULL Output: 5->4->3->2->1->NULL Example 2: Input: 1->2->NULL Output: 2->1->NULL Example 3: Input: NULL Output: NULL Constraints …

Learn about building a simple micro-service application using Spring Boot and Kotlin. Dedicated support for Kotlin was introduced since Spring Framework 5.0 — 1. Overview In this article, we’re going to build a REST API using Spring Boot 2.x and Kotlin. Meanwhile, dedicated support for Kotlin was introduced since Spring Framework 5.0. We can read about the supported features in the official Spring Framework documentation.

A guide about the different ways to create a Spring Boot project. Spring Boot is one of the most popular frameworks for creating web applications — 1. Overview In this tutorial, we’ll look into the different ways we can create a Spring Boot project. 2. Using Spring Initializer in spring.io We can create a Spring Boot project by using the Spring Initializer in start.spring.io. …

The definitive guide to handling null references in Kotlin — Overview In this article, we’ll look into the null safety in Kotlin. Any programming language which has the concept of null reference throws a NullPointerException. It has been referred to as a billion-dollar mistake. (Wiki) Nullable and Non-Nullable Type Kotlin aims at eliminating the risk of NullPointerException. …

A practical example of Hexagonal Architecture in Java — 1. Overview In this tutorial, we’ll take a look into the hexagonal architecture in Java. To illustrate this further, we’ll create a Spring Boot application. 2. Hexagonal Architecture The hexagonal architecture describes a pattern for designing software applications around the domain logic. …