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List Files in a Directory in Java 1. Overview In this quick tutorial, we’ll look into different ways to list files within a directory. 2. Listing If we want to list all the files in the directory and skip further digging into sub-directories, we can simply use java.io.File#listFiles: public Set<String>… Continue Reading java-list-directory-files
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Creating Java static final Equivalents in Kotlin 1. Overview In this quick tutorial, we’ll discuss static final variables in Java and their equivalent in Kotlin. In Java, declaring static final variables helps us create constants. And in Kotlin, we have several ways to achieve the same goal. 2. Inside an object Firstly,… Continue Reading kotlin-java-static-final
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Spring Tutorial The Spring Framework is a mature, powerful and highly flexible framework focused on building web applications in Java. One of the core benefits of Spring is that it takes care of most of the low-level aspects of building the application to allow us to actually focus on features and business logic.… Continue Reading spring-tutorial
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Introduction to ActiveJDBC 1. Introduction ActiveJDBC is a lightweight ORM following the core ideas of ActiveRecord, the primary ORM of Ruby on Rails. It focuses on simplifying the interaction with databases by removing the extra layer of typical persistence managers and focuses on the usage of SQL rather than creating… Continue Reading active-jdbc
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Void Type in Java 1. Overview As Java developers, we might have encountered the Void type at some occasion and wondered what was its purpose. In this quick tutorial, we’ll learn about this peculiar class and see when and how to use it as well as how to avoid using… Continue Reading java-void-type
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Mathematical and Aggregate Operators in RxJava 1. Introduction Following the introduction to RxJava article, we’re going to look at aggregate and mathematical operators. These operations must wait for the source Observable to emit all items. Because of this, these operators are dangerous to use on Observables that may represent very… Continue Reading rxjava-math
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Get a Value by Key in a JSONArray 1. Overview JSON is a light-weight and language independent data-interchange format used for most client-server communications. JSONObject and JSONArray are the two common classes usually available in most of the JSON processing libraries. A JSONObject stores unordered key-value pairs, much like a… Continue Reading java-jsonarray-get-value-by-key
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Guide to the Fork/Join Framework in Java 1. Overview The fork/join framework was presented in Java 7. It provides tools to help speed up parallel processing by attempting to use all available processor cores – which is accomplished through a divide and conquer approach. In practice, this means that the… Continue Reading java-fork-join
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A Spring Custom Annotation for a Better DAO Spring Persistence Spring Annotations 1. Overview In this tutorial, we’ll implement a custom Spring annotation with a bean post-processor. So how does this help? Simply put – we can reuse the same bean instead of having to create multiple, similar beans of… Continue Reading spring-annotation-bean-pre-processor
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Using JUnit 5 with Gradle 1. Overview In this tutorial, we’re going to run tests on the new JUnit 5 platform with the Gradle build tool. We’ll configure a project that supports both the old and the new version. Feel free to read A Guide to JUnit 5 for more… Continue Reading junit-5-gradle
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