Fully Understand about MapStruct in Java - Advanced Mapping Library

As microservices and distributed applications quickly take over the development world - data integrity and security are more important than ever. A secure communication channel and limited data transfer between these loosely coupled systems are paramount. Most of the time, the end-user or service doesn’t need to access the entirety of the data from a model, but only some specific parts.

Data Transfer Objects (DTOs) are regularly applied in these applications. DTOs are just objects that hold the requested information of another object. Typically, the information is limited in scope. Since DTOs are a reflection of the original objects - mappers between these classes play a key role in the conversion process.

In this article, we’ll be diving into MapStruct - an extensive mapper for Java Beans.

#java #tool #mapstruct in java

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How to Install OpenJDK 11 on CentOS 8

What is OpenJDK?

OpenJDk or Open Java Development Kit is a free, open-source framework of the Java Platform, Standard Edition (or Java SE). It contains the virtual machine, the Java Class Library, and the Java compiler. The difference between the Oracle OpenJDK and Oracle JDK is that OpenJDK is a source code reference point for the open-source model. Simultaneously, the Oracle JDK is a continuation or advanced model of the OpenJDK, which is not open source and requires a license to use.

In this article, we will be installing OpenJDK on Centos 8.

#tutorials #alternatives #centos #centos 8 #configuration #dnf #frameworks #java #java development kit #java ee #java environment variables #java framework #java jdk #java jre #java platform #java sdk #java se #jdk #jre #open java development kit #open source #openjdk #openjdk 11 #openjdk 8 #openjdk runtime environment

Fully Understand about MapStruct in Java - Advanced Mapping Library

As microservices and distributed applications quickly take over the development world - data integrity and security are more important than ever. A secure communication channel and limited data transfer between these loosely coupled systems are paramount. Most of the time, the end-user or service doesn’t need to access the entirety of the data from a model, but only some specific parts.

Data Transfer Objects (DTOs) are regularly applied in these applications. DTOs are just objects that hold the requested information of another object. Typically, the information is limited in scope. Since DTOs are a reflection of the original objects - mappers between these classes play a key role in the conversion process.

In this article, we’ll be diving into MapStruct - an extensive mapper for Java Beans.

#java #tool #mapstruct in java

Going Beyond Java 8: Local Variable Type Inference (var) - DZone Java

According to some surveys, such as JetBrains’s great survey, Java 8 is currently the most used version of Java, despite being a 2014 release.

What you are reading is one in a series of articles titled ‘Going beyond Java 8,’ inspired by the contents of my book, Java for Aliens. These articles will guide you step-by-step through the most important features introduced to the language, starting from version 9. The aim is to make you aware of how important it is to move forward from Java 8, explaining the enormous advantages that the latest versions of the language offer.

In this article, we will talk about the most important new feature introduced with Java 10. Officially called local variable type inference, this feature is better known as the **introduction of the word **var. Despite the complicated name, it is actually quite a simple feature to use. However, some observations need to be made before we can see the impact that the introduction of the word var has on other pre-existing characteristics.

#java #java 11 #java 10 #java 12 #var #java 14 #java 13 #java 15 #verbosity

Java Map Interface Example | Map Interface in Java

Java Map is an object that is designed to store associations between keys and their corresponding values – or key/value pairs. Both the key and value are objects. Essentially, a key has to be unique, whereas values may not be so. An important thing to note is that maps don’t implement the Iterable  interface and therefore, one can not cycle through a map using a for-each style for loop.

In Java, one cannot obtain an iterator to a map. However, one can obtain a collection-view of a map that does allow the use of either the for loop or an iterator.

Java Map Interface

A map contains values based on the key, i.e., key and value pair.

Each key and value pair is known as the entry. The Map contains unique keys. The Map is useful if you have to search, update, or delete elements based on the key.

A Map doesn’t allow duplicate keys, but you can have duplicate values.  HashMap and LinkedHashMap allow the null keys and values, but the  TreeMap doesn’t allow any null key or value.

#java #java map #map interface in java

Guide to Understanding Generics in Java

Introduction

Java is a type-safe programming language. Type safety ensures a layer of validity and robustness in a programming language. It is a key part of Java’s security to ensure that operations done on an object are only performed if the type of the object supports it.

Type safety dramatically reduces the number of programming errors that might occur during runtime, involving all kinds of errors linked to type mismatches. Instead, these types of errors are caught during compile-time which is much better than catching errors during runtime, allowing developers to have less unexpected and unplanned trips to the good old debugger.

Type safety is also interchangeably called strong typing.

Java Generics is a solution designed to reinforce the type safety that Java was designed to have. Generics allow types to be parameterized onto methods and classes and introduces a new layer of abstraction for formal parameters. This will be explained in detail later on.

There are many advantages of using generics in Java. Implementing generics into your code can greatly improve its overall quality by preventing unprecedented runtime errors involving data types and typecasting.

This guide will demonstrate the declaration, implementation, use-cases, and benefits of generics in Java.

#java #guide to understanding generics in java #generics #generics in java #guide to understanding generics in java