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Binary Numbers in Java 1. Introduction The binary number system uses 0s and 1s to represent numbers. Computers use binary numbers to store and perform operations on any data. In this tutorial, we’ll learn how to convert binary to decimal and vice versa. Also, we’ll perform addition and subtraction on… Continue Reading java-binary-numbers
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Java Web Weekly, Issue 124 At the very beginning of last year, I decided to track my reading habits and share the best stuff here, on Baeldung. Haven’t missed a review since. Here we go… 1. Spring and Java ===== >> Reducing boilerplate code with Project Lombok [codecentric.de] A quick… Continue Reading java-web-weekly-124
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Generate Combinations in Java 1. Introduction In this tutorial, we’ll discuss the solution of the k-combinations problem in Java. First, we’ll discuss and implement both recursive and iterative algorithms to generate all combinations of a given size. Then we’ll review solutions using common Java libraries. 2. Combinations Overview Simply put,… Continue Reading java-combinations-algorithm
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The Difference Between map() and flatMap() 1. Overview map() and flatMap() APIs stem from functional languages. In Java 8, you can find them in Optional, Stream and in CompletableFuture (although under slightly different name). Streams represent a sequence of objects, whereas optionals are classes that represent a value that can… Continue Reading java-difference-map-and-flatmap
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Kotlin Annotations 1. Overview In this tutorial, we’ll give an overview of Kotlin annotations. We’ll demonstrate how to apply them, how to create and customize our own ones. We’ll then briefly discuss the interplay between annotations and keywords in Java and Kotlin. Finally, we’ll give a simple example of a… Continue Reading kotlin-annotations
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SLF4J Warning: Class Path Contains Multiple SLF4J Bindings 1. Overview When we use SLF4J in our applications, we sometimes see a warning message about multiple bindings in the classpath printed to the console. In this tutorial, we’ll try to understand why we see this message and how to resolve it.… Continue Reading slf4j-classpath-multiple-bindings
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Spring Security Form Login 1. Introduction This article is going to focus on Login with Spring Security. We’re going to build on top of the simple previous Spring MVC example, as that’s a necessary part of setting up the web application along with the login mechanism. Further reading: Spring Security… Continue Reading spring-security-login
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Software Transactional Memory in Java Using Multiverse 1. Overview In this article, we’ll be looking at the Multiverse library – which helps us to implement the concept of Software Transactional Memory in Java. Using constructs out of this library, we can create a synchronization mechanism on shared state – which… Continue Reading java-multiverse-stm
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Geospatial Support in ElasticSearch 1. Introduction Elasticsearch is best known for its full-text search capabilities but it also features full geospatial support. We can find more about setting up Elasticsearch and getting started in this previous article. Let’s take a look on to how we can save geo-data in Elasticsearch… Continue Reading elasticsearch-geo-spatial
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Extra Login Fields with Spring Security 1. Introduction In this article, we’ll implement a custom authentication scenario with Spring Security by adding an extra field to the standard login form. We’re going to focus on 2 different approaches, to show the versatility of the framework and the flexible ways we… Continue Reading spring-security-extra-login-fields
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