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An Introduction to Refactoring with IntelliJ IDEA 1. Overview Keeping the code tidy is not always easy. Fortunately for us, our IDEs are pretty smart nowadays and can help us in achieving this. In this tutorial, we’re going to focus on IntelliJ IDEA, the JetBrains Java code editor. We’ll see… Continue Reading intellij-refactoring
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Intro to Spring Boot Starters 1. Overview Dependency management is a critical aspects of any complex project. And doing this manually is less than ideal; the more time you spent on it the less time you have on the other important aspects of the project. Spring Boot starters were built… Continue Reading spring-boot-starters
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The Decorator Pattern in Java 1. Overview A Decorator pattern can be used to attach additional responsibilities to an object either statically or dynamically. A Decorator provides an enhanced interface to the original object. In the implementation of this pattern, we prefer composition over an inheritance – so that we… Continue Reading java-decorator-pattern
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Guide to hashCode() in Java 1. Overview Hashing is a fundamental concept of computer science. In Java, efficient hashing algorithms stand behind some of the most popular collections we have available – such as the HashMap (for an in-depth look at HashMap, feel free to check this article) and the… Continue Reading java-hashcode
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A Maze Solver in Java 1. Introduction In this article, we’ll explore possible ways to navigate a maze, using Java. Consider the maze to be a black and white image, with black pixels representing walls, and white pixels representing a path. Two white pixels are special, one being the entry… Continue Reading java-solve-maze
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Java Weekly, Issue 270 Here we go… 1. Spring and Java ===== >> What’s new with Spring Initializr [spring.io] A quick look at the improved API for generating new projects, which now lets you customize project generation without forking the library. Very cool. >> Integration Tests with @SpringBootTest [reflectoring.io] A… Continue Reading java-weekly-270
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Java Scanner 1. Overview In this tutorial, we’ll illustrate how to use the Java Scanner to read input and find and skip patterns with different delimiters. 2. Scan a File First – let’s see how to read a file using Scanner. In the following example – we read a file… Continue Reading java-scanner
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Guide to Guava ClassToInstanceMap 1. Overview A ClassToInstanceMap<B> is a special kind of map that associates classes with corresponding instances. It makes sure that all the keys and the values are subtypes of the upper bound type B. ClassToInstanceMap extends Java’s Map interface and provides two additional methods: T getInstance(Class<T>)… Continue Reading guava-class-to-instance-map
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Custom Error Message Handling for REST API 1. Overview In this tutorial – we’ll discuss how to implement an global error handler for a Spring REST API. We will use the semantics of each exception to build out meaningful error messages for client, with the clear goal of giving that… Continue Reading global-error-handler-in-a-spring-rest-api
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Get the Current Date, Time and Timestamp in Java 8 1. Introduction This quick article describes how we may get the current date, current time and current time stamp in Java 8. 2. Current Date First, let’s use java.time.LocalDate to get the current system date: LocalDate localDate = LocalDate.now(); To… Continue Reading current-date-time-and-timestamp-in-java-8
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