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Intersection of Two Lists in Java 1. Overview In this tutorial, we’ll learn how to retrieve the intersection of two Lists. Like many other things, this has become much easier thanks to the introduction of streams in Java 8. 2. Intersection of Two Lists of Strings Let’s create two Lists of Strings… Continue Reading java-lists-intersection
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New Stream, Comparator and Collector in Guava 21 1. Introduction This article is first in the series about the new features launched with Version 21 of the Google Guava library. We’ll discuss newly added classes and some major changes from previous versions of Guava. More specifically, we’ll discuss additions and… Continue Reading guava-21-new
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Compact Strings in Java 9 1. Overview Strings in Java are internally represented by a char[] containing the characters of the String. And, every char is made up of 2 bytes because Java internally uses UTF-16. For instance, if a String contains a word in the English language, the leading… Continue Reading java-9-compact-string
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Spring Security Remember Me 1. Overview This tutorial will show how to enable and configure Remember Me functionality in a web application with Spring Security. Setting up the MVC application with security and a simple form login has already been discussed. The mechanism will be able to identify the user… Continue Reading spring-security-remember-me
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Implementing a Binary Tree in Java 1. Introduction In this article, we’ll cover the implementation of a binary tree in Java. For the sake of this article, we’ll use a sorted binary tree that will contain int values. 2. Binary Tree A binary tree is a recursive data structure where… Continue Reading java-binary-tree
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Spring Data JPA Delete and Relationships 1. Overview In this tutorial, we’ll have a look at how deleting is done in Spring Data JPA. 2. Sample Entity As we know from the Spring Data JPA reference documentation, repository interfaces provide us some basic support for entities. If we have an… Continue Reading spring-data-jpa-delete
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Guide to Guava’s PreConditions 1. Overview In this tutorial, we’ll show how to use the Google Guava’s Preconditions class. The Preconditions class provides a list of static methods for checking that a method or a constructor is invoked with valid parameter values. If a precondition fails, a tailored exception is… Continue Reading guava-preconditions
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web.xml vs Initializer with Spring 1. Overview In this article we’ll cover three different approaches of configuring a DispatcherServlet available in recent versions of the Spring Framework: We’ll start with an XML configuration and a web.xml file Then we’ll migrate the Servlet declaration from the web.xml file to Java config,… Continue Reading spring-xml-vs-java-config
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How to Get the Last Element of a Stream in Java? 1. Overview The Java Stream API was the major feature of the Java 8 release. Streams represent lazily-evaluated sequences of objects and provide a rich, fluent, and monadic-like API. In this article, we will have a quick look into… Continue Reading java-stream-last-element
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Intro to Spring Security Expressions 1. Introduction In this tutorial we’ll focus on Spring Security Expressions, and of course on practical examples with these expressions. Before looking at more complex implementations (such as ACL), it’s important to have a solid grasp on security expressions – as they can be quite… Continue Reading spring-security-expressions
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