How to Check Java Version

ava is one of the most popular programming languages in the world, used for building different types of cross-platform applications.

This article explains how to check what version of Java is installed on your Linux system using the command line. This can be useful when installing applications that require a specific version of Java.

Java Versioning

Java uses semantic versioning . Production-ready releases are versioned in the following scheme:

MAJOR.MINOR.SECURITY

For example, in Java 11.0.8, 11 is a major version, 0 is a minor version, and 8 is a security version.

• MAJOR - Major releases are bringing new features and functions.
• MINOR - Minor releases contain various bug fixes and compatible improvements.
• SECURITY - Security releases provide critical security fixes.

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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

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

How to Install Multiple Versions of Java on the Same Machine

Some time back, I wrote the article Java Lambda Expression Explained with Example, but it was easy for me to explore Java 8 because I was using it in my project and allowed to install it. But in my current project, we are still using Java 8, and now, I want to upgrade and learn Java 11, but unfortunately, I cannot install it.

And this happens a lot with Java developers. Sometimes, you want to learn and explore the latest version of Java, but you cannot install it on your machine because you and your team are working on an older version, e.g. Java 8, and you don’t want to accidentally break your project.

Or, suppose you are working on multiple projects, some of which use Java 8 and some of which are new projects using Java 11. So, in order to work on both of these projects, you will need to install multiple versions of the JDK on your machine and be able to switch between them.

What if there is a way to install multiple versions of Java and turn different versions on and off, depending on your needs.

Well, there is a tool called SDKMan which allows us to do just that. According to their website:

SDKMan! is a tool for managing parallel versions of multiple S oftware Development Kits on most Unix-based systems. It provides a convenient Command Line Interface (CLI) and API for installing, switching, removing, and listing Candidates.

Some points about SDKMan are as follows:

1. SDKMan is free to use and is developed by the open-source community.
2. SDKMan is written in bash and only requires curl and zip/unzip programs to be present on your system.
3. We do not need to worry about setting the _HOME and PATH environment variables because SDKMan handles them automatically.

Installing SDKMan

SDKMan can run on any UNIX-based platforms such as Mac OSX, Linux, Cygwin, Solaris, and FreeBSD, and we can install it using the following commands:

$ curl -s "https://get.sdkman.io" | bash

$ source “$HOME/.sdkman/bin/sdkman-init.sh”

We can verify the installation using `sdk version` and `sdk help` commands, which will give us complete help with the usage of the `sdk `command.

> Because SDKMan is written in [bash](https://www.gnu.org/software/bash/) and only requires [curl](http://curl.haxx.se/) and [zip/unzip](http://www.info-zip.org/) to be present on your system, you can install SDKMan on Windows as well either by first installing [Cygwin](https://www.cygwin.com/install.html) or [Git Bash for Windows](https://git-scm.com/download/win) environment and then running the above commands.

#java #jvm #java 9 #jdk #java 11 #java 10 #jdk 11 #versions

Spring Boot and Java 16 Records

In this article, we will discuss Java 16’s newest feature, Records. Then we will apply this knowledge and use it in conjunction with a Spring Boot application.

On March 16th, 2021, Java 16 was GA. With this new release, tons of new exciting features have been added. Check out the release notes to know more about these changes in detail. This article’s focus will be on Java Records, which got delivered with JEP 395. Records were first introduced in JDK 14 as a preview feature proposed by JEP 359, and with JDK 15, they remained in preview with JEP 384. However, with JDK 16, Records are no longer in preview.

I have picked Records because they are definitely the most favored feature added in Java 16, according to this Twitter poll by Java Champion Mala Gupta.

I also conducted a similar survey, but it was focused on features from Java 8 onwards. The results were not unexpected, as Java 8 is still widely used. Very unfortunate, though, as tons of new features and improvements are added to newer Java versions. But in terms of features, Java 8 was definitely a game-changer from a developer perspective.

So let’s discuss what the fuss is about Java Records.

#java #springboot #java programming #records #java tutorials #java programmer #java records #java 16

How to Check Java Version

Java is a cross-platform, object-oriented programming language developed by the Sun Microsystems in the year 1995. Today, java is used by the billion’s of devices, games, media players, audio vide applications etc.

As of today Java SE 15 is the latest version available for the installation. JDK 16 will be the next version expected to release in March, 2021. Both are the short term releases supports till next release only. After that JDK 17 will the next Long-Term Support release, will be supported for approx. eight years.

Java installation tutorials:

• Install Java on Ubuntu 20.04
• Install Java on Debian 10
• Install Java on CentOS 8
• Install Java on macOS

This tutorial described you to how to check Java version installed on a system.

#java #java #jdk #jre #version