Home » JVM Languages

JVM Languages

Kotlin / IntelliJ quick hint: Operator navigation

This is just a quick hint if you are programming Kotlin with IntelliJ: In IntelliJ you can ctrl-click on operators to navigate to the operator definition (similar to ctrl-clicking on methods). This also works for the get operator (you can click on the [] brackets) and for ranges (you can click on the dots (..) between the start and end ...

Read More »

Kotlin infix functions

What are infix functions? If you are using Kotlin chances are high you already used infix functions. Maybe without knowing it. When calling infix functions it is possible to omit the dot and the parentheses. So instead of 1 car.move(forward) we can write: 1 car move forward Here are a few examples of commonly used infix functions in Kotlin. The ...

Read More »

Join Two Lists in Kotlin

A quick programming guide to join two lists in kotlin. Joining two lists or ArrayList can be done using List addAll() or apache commons ListUtils.union() method and show examples on each method. 1. Introduction In this article, You’ll learn how to join two lists in kotlin programming language. List api has addAll() method and apache ListUtils.union() method to add two ...

Read More »

Advanced Creation of Hamcrest Matchers in Kotlin

This article is a rewrite of an older one done in Java. This one is done in Kotlin instead. Intro Last time, I went over what a Hamcrest Matcher was, how it’s used, and how to make one. In this article, I will explain more advanced steps in the creation of Hamcrest Matchers. First, I’ll share how to make your ...

Read More »

How to Make Your Own Hamcrest Matchers in Kotlin

This article is a rewrite of an older one done in Java. This one is done in Kotlin instead. Intro to Hamcrest Matchers First things first, I should quickly explain what a Hamcrest Matcher is. When doing unit testing, the built-in assertion types that come with the testing framework are generally pretty limited. They make it very easy for a ...

Read More »

Scala Main class

Adding a main class is Scala is something that I always end up searching so next time it shall be through my blog. You can go for the extends App option One way is to add a main class by extending the App class. Everything else that get’s executed on that block is part of the “main” function. 1 2 ...

Read More »

Project reactor – de-structuring a Tuple

spring-interview-questions-answers

Tuples are simple data structures that hold a fixed set of items, each of a different data type. Project Reactor provides a Tuple data structure that can hold about 8 different types. Tuples are very useful, however one of the issues in using a Tuple is that it is difficult to make out what they hold without de-structuring them at ...

Read More »

Get Groovy with Gradle

Friends don’t let friends write user auth. Tired of managing your own users? Try Okta’s API and Java SDKs today. Authenticate, manage, and secure users in any application within minutes. In the Java world, there are two main build systems: Gradle and Maven. A build system chiefly manages potentially complex webs of dependencies and compiles the project. It also packages ...

Read More »

Kotlin Data Classes: Why, What and How?

In this post on Kotlin’s data classes, we’ll take a look at how data classes are better than regular Java POJO (Plain Old Java Object) classes, and how they make our everyday lives easier. We’ll also take a look at some of the caveats of data classes. I’ve also written an article on Java vs Kotlin, if you’re interested, check ...

Read More »