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Java 11 Single File Source Code 1. Introduction JDK 11, which is the implementation of Java SE 11, released in September 2018. In this tutorial, we’ll cover the new Java 11 feature of launching single-file source-code programs. 2. Before Java 11 A single-file program is one where the program fits… Continue Reading java-single-file-source-code
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Designing a User Friendly Java Library 1. Overview Java is one of the pillars of the open-source world. Almost every Java project uses other open-source projects since no one wants to reinvent the wheel. However, many times it happens that we need a library for its functionality but we have… Continue Reading design-a-user-friendly-java-library
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Using JWT with Spring Security OAuth 1. Overview In this tutorial, we’ll discuss how to get our Spring Security OAuth2 implementation to make use of JSON Web Tokens. We’re also continuing to built on top of the previous article in this OAuth series. Further reading: Logout in an OAuth Secured… Continue Reading spring-security-oauth-jwt
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A Guide to WatchService in Java NIO2 1. Overview In this article, we are going to explore the WatchService interface of Java NIO.2 filesystem APIs. This is one of the lesser known features of the newer IO APIs that were introduced in Java 7 alongside FileVisitor interface. To use the… Continue Reading java-nio2-watchservice
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Differences Between HashMap and Hashtable 1. Overview In this short tutorial, we are going to focus on the core differences between the Hashtable and the HashMap. 2. Hashtable and HashMap in Java Hashtable and HashMap are quite similar – both are collections that implement the Map interface. Also, the put(), get(), remove(), and containsKey() methods provide constant-time… Continue Reading hashmap-hashtable-differences
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Quicksort Algorithm Implementation in Java 1. Overview In this tutorial, we’ll explore the QuickSort algorithm in detail, focusing on its Java implementation. We’ll also discuss its advantages and disadvantages and then analyze its time complexity. 2. QuickSort Algorithm Quicksort is a sorting algorithm, which is leveraging the divide-and-conquer principle. It has… Continue Reading java-quicksort
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Join Array of Primitives with Separator in Java 1. Introduction In this quick tutorial, we’ll learn how to join an array of primitives with a single-character separator in Java. For our examples, we’ll consider two arrays: an array of int and an array of char. 2. Defining the Problem Let’s start… Continue Reading java-join-primitive-array
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Generate equals() and hashCode() with Eclipse 1. Introduction In this article, we explore generating equals() and hashCode() methods using the Eclipse IDE. We’ll illustrate how powerful and convenient the Eclipse’s code auto-generation is, and also emphasize that diligent testing of code is still necessary. 2. Rules equals() in Java is… Continue Reading java-eclipse-equals-and-hashcode
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Rate Limiting in Spring Cloud Netflix Zuul 1. Introduction Spring Cloud Netflix Zuul is an open source gateway that wraps Netflix Zuul. It adds some specific features for Spring Boot applications. Unfortunately, rate limiting is not provided out of the box. In this tutorial, we will explore Spring Cloud Zuul RateLimit which… Continue Reading spring-cloud-zuul-rate-limit
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Self-Healing Applications with Kubernetes and Spring Boot 1. Introduction In this tutorial, we’re going to talk about Kubernetes‘s probes and demonstrate how we can leverage Actuator‘s HealthIndicator to have an accurate view of our application’s state. For the purpose of this tutorial, we’re going to assume some pre-existing experience with Spring Boot Actuator, Kubernetes, and Docker. 2. Kubernetes… Continue Reading spring-boot-kubernetes-self-healing-apps
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