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Guide to the JDBC ResultSet Interface 1. Overview The Java Database Connectivity (JDBC) API provides access to the database from a Java application. We can use JDBC to connect to any database as long as the supported JDBC driver is available. The ResultSet is a table of data generated by… Continue Reading jdbc-resultset
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Number of Digits in an Integer in Java 1. Introduction In this quick tutorial, we’ll explore different ways of getting the number of digits in an Integer in Java. We’ll also analyze those different methods and will figure out which algorithm would best fit in our situation. 2. Number of… Continue Reading java-number-of-digits-in-int
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Spring AMQP in Reactive Applications 1. Overview This tutorial shows how to create a simple Spring Boot Reactive Application that integrates with the RabbitMQ messaging server, a popular implementation of the AMQP messaging standard. We cover both – point-to-point and publish-subscribe scenarios – using a distributed setup that highlights the… Continue Reading spring-amqp-reactive
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Quick Guide to MyBatis 1. Introduction MyBatis is an open source persistence framework which simplifies the implementation of database access in Java applications. It provides the support for custom SQL, stored procedures and different types of mapping relations. Simply put, it’s an alternative to JDBC and Hibernate. 2. Maven Dependencies… Continue Reading mybatis
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Converting Strings to Enums in Java 1. Introduction In this short article, we will see how to convert a String into an enum in Java quickly. 2. Setup We are dealing with core Java so we do not need to add any additional artifacts. We will work with the PizzaDeliveryStatusEnum… Continue Reading java-string-to-enum
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State Design Pattern in Java 1. Overview In this tutorial, we’ll introduce one of the behavioral GoF design patterns – the State pattern. At first, we’ll give an overview of its purpose and explain the problem it tries to solve. Then, we’ll have a look at the State’s UML diagram… Continue Reading java-state-design-pattern
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Java Weekly, Issue 257 Here we go… 1. Spring and Java ===== >> Practice Mock Interviews & Coding Problems with Pramp Sponsored If you’re looking to improve your interview game, definitely have a look at the Pramp mock interviews on Data Structures and Algorithms, System Design, etc. Get unlimited tries. >> Hibernate Tips: How to Exclude… Continue Reading java-weekly-257
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Will an Error Be Caught by Catch Block in Java? 1. Overview In this short article, we’re going to show how to properly catch Java errors, and we’ll explain when it doesn’t make sense to do so. For detailed information about Throwables in Java, please have a look at our… Continue Reading java-error-catch
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Testing an Abstract Class With JUnit 1. Overview In this tutorial, we’ll analyze various use cases and possible alternative solutions to unit-testing of abstract classes with non-abstract methods. Note that testing abstract classes should almost always go through the public API of the concrete implementations, so don’t apply the below… Continue Reading junit-test-abstract-class
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Geolocation by IP in Java 1. Introduction In this article, we will explore how to get geographic location data from an IP address using the MaxMind GeoIP2 Java API with the free GeoLite2 database. We will also see this in action using a simple Spring MVC Web demo application. 2.… Continue Reading geolocation-by-ip-with-maxmind
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