Java is a popular object-oriented programming language used for building applications.

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To run and develop an application in Java, you need to install the Java Development Kit (JDK). There are two different implementations of JDK – OpenJDK and Oracle JDK.

• OpenJDK is the free, open-source version of Java, available under the GPL v2 license.
• Oracle JDK is a paid, full-featured, Java software-package.

1. Scroll to the Java SE 8u171/ 8u172 section in the middle of the Oracle Java download page and click on the Download button right below JDK. Then look for the Java SE Development Kit 8u172 section. Here is the direct link to download the jdk 8u172 installer for Windows 32 or 64 bit.
2. Java Plug-in technology, included as part of the Java 2 Runtime Environment, Standard Edition (JRE), establishes a connection between popular browsers and the Java platform. Java allows applications to be downloaded over a network and run within a guarded sandbox. Security restrictions are easily imposed on the sandbox.
3. Java Development Kit is the official, reliable, and trustworthy development kit for Java programming. It has been developed by Oracle and is used by programmers around the world. Simply put, JDK combines a wide range of tools and software required to debug, run, and compile apps and applets designed with the Java programming language.

When you install the Java Development Kit (JDK), the associated Java Runtime Environment (JRE) is installed at the same time. The JavaFX SDK and Runtime are also installed and integrated into the standard JDK directory structure. Depending on your processor, the downloaded file has one of the following names: jdk-8u version-macosx-amd64.dmg. Red Hat Developer. We serve the builders. The problem solvers who create careers with code. Join us if you’re a developer, software engineer, web designer, front-end designer, UX designer, computer scientist, architect, tester, product manager, project manager or team lead. JDK 8u171 vs JDK 8u172. I've been working on my first open source java library and today I finished it! It took me around 3 weeks to make it. Please see the Oracle Java SE Support Roadmap for details. One of the items of interest in this CPU release that you should be aware of is that JDK 8u191 also includes JDK 8u191 for ARM. Information about this product is included in Java™ Development Kit for ARM Release Notes 8 Update 191 and in the README Java™ Platform, Standard Edition 8.

In this guide, learn how to install Java on a CentOS 8 server, including the OpenJDK and the Oracle JDK implementation.

• A system with CentOS 8 installed
• A user account with sudo or root privileges
• Access to a terminal window / command line (Search > terminal)
• An Oracle account (only required for Java JDK)

Open JDK is the free version of Java that consists of the Java Runtime Environment (JRE) and Development Tools. To run and develop Java applications, you need to install the complete package with its development kit.

Currently, there are two LTS versions of OpenJDK – OpenJDK 8 and OpenJDK 11. Oracle supports and updates both versions regularly. Although new releases come out every six months, they are maintained only until the next release. Therefore, it is not advisable to install anything other than version 8 or version 11 unless you have a good reason to do so.

Note: You can have more than one version of Java installed on your system. That's helpful if you’re working on different projects that require different Java versions. Such configuration requires you specify the Java environment each time you work on a project.

Open a terminal window and enter the following:

Confirm any prompts, allow the process to finish, and verify the installation with:

Jdk-8u144-macosx-x64.dmg

To install the older LTS version, OpenJDK 8, use the following command:

Verify Java version 8 is now installed with:

If you are not developing in Java, but still need to run Java applications, you can skip installing the JDK and set up the Java Runtime Environment (JRE).

JRE is a combination of a Java Virtual Machine (JVM) and the libraries required for executing the code in runtime. It is the minimum requirement for running any Java application.

Just like with the Development Kit, there are two LTS versions of the Runtime Environment – JRE 8 and JRE 11.

To install JRE 11, run:

To install JRE 8, use the command:

Note: Remember - You don't need to install OpenJRE if you already have OpenJDK. The Runtime Environment comes with the Java Development Kit by default.

Another alternative to OpenJDK is only installing the headlessversion.

Just like OpenJRE, Java headlessis part of OpenJDK and should not be installed on top of it.

The headless option is a minimal runtime environment, without a graphical interface, more suitable for server applications. It uses minimal system resources and doesn’t include keyboard or mouse support.

Install OpenJDK 11 headlessby entering the following:

For OpenJDK 8 headlessrun:

When installing Oracle Java on CentOS 8, make sure to download directly from the official source, Oracle. This requires creating an account on the Oracle website.

1. Open a web browser and navigate to the Oracle download page. Here you will find all the Java download links for different versions of Java SE.

Note: Java SE is the Standard Edition of the software, mainly used for developing portable desktop apps. An alternative to Java SE is Java Enterprise Edition (Java EE), more suitable for enterprise-level development.

2. Scroll down to see different versions of Java SE and find the one you need. In this article, we are sticking to the LTS release – Java 11.

The Java SE 11.0.5 (LTS) section includes a download button to install Oracle JDK Auto tune efx windows 10 64 bits. (Java Development Kit). Unlike in the previous versions, this edition doesn’t offer the possibility to download Oracle JRE (Java Runtime Environment) as a separate package.

3. Click the blue Download button on the right, just below the Oracle JDK heading.

4. The link takes you to the next page of the download section and informs you about the Oracle JDK License Update. Make sure to review it before you download the software.

Jdk-8u201-macosx-x64.dmg

5. Scroll down and find the gray box labeled Java SE Development Kit 11.0.5. In it, you will find all the available packages for the software.

6. To download any of the packages, you first need to check the box that confirms you Accept License Agreement.

7. For CentOS 8, the Linux x64 .rpm file is a good package choice since it is easier to install. If you’re running a 32-bit operating system, use Linux x86.

8. To gain access to the file, log in with your Oracle account.

9. Allow the download to finish. Once it’s complete, open the terminal and enter the following:

Note: Replace userwith the actual username. Additionally, if your filename is different, use the filename of your download.

9. Once the installation finishes, you can check the Java version with the following:

You might have 2 different versions of Java on your system. To set one as the default , use the command:

The system displays a list of different Java versions. If you like the default, press Enter.

If you want to change it, type the number of the version you want, then press Enter.

With the default version set, you can configure JAVA_HOME on your CentOS 8.

By doing so, applications compiled in this programming language can easily access Java’s installation path.

How you define the JAVA_HOME environment depends on which version of Java you have. To define the location of Java 8 or Java 11, refer to phoenixNAP’s instructional guide on How to Set JAVA_HOME Environment Variable.

You should now have one (or more) versions of Java running on CentOS 8.

REmember, if you only need support for running Java applications, choose JRE (Java Runtime Environment). Install JDK (Java Developer Kit) if you need to create Java applications.

In general, your system will be more stable for longer if you choose a LTS (Long-Term Support) version.

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