Linux Tactic

Mastering Java on Linux: Versioning Installation and Multiple Versions

Java is a widely used programming language and platform that is used to build scalable and secure applications for various operating systems. Java can be used to create everything from desktop applications to web applications, mobile applications, and even cloud-based services.

In this article, we will focus on Java versioning, checking Java version, multiple Java installations, and installing Java on Linux.

Java Versioning

Java releases are versioned with a combination of MAJOR, MINOR, and SECURITY numbers. The MAJOR number signifies significant changes in the API and may require code changes when upgrading.

The MINOR number signifies minor changes to the API, and code changes may not be required when upgrading. The SECURITY number indicates critical security updates.

Production-ready releases are odd-numbered versions, with even numbers designated for non-production releases. Java follows a six-month release cadence, with new releases every six months.

Checking Java Version

To check the Java version installed on your Linux machine, open a terminal and type the following command:

java -version

This command will display the current version of the Java runtime environment installed on your machine. If multiple versions of Java are installed, the default version will be displayed.

Multiple Java Installations

You may have multiple versions of Java installed on your Linux machine. To switch between Java versions, you can use the following command:

sudo update-alternatives –config java

This command will display a list of Java versions available on your machine. Select the desired version and press Enter to set it as the default.

Installing Java on Linux

The process of installing Java on Linux varies depending on the distribution you are using. Here are the steps to install Java on Ubuntu, Debian, and CentOS:

Install Java on Ubuntu

1. Open a terminal and type the following command:

sudo apt-get update

This command updates the package list to ensure you have the latest version available. 2.

Type the following command to install the default JRE:

sudo apt-get install default-jre

This command will download and install the default Java runtime environment. 3.

If you require the JDK, type the following command:

sudo apt-get install default-jdk

This command will download and install the default Java development kit.

Install Java on Debian

1. Open a terminal and type the following command:

sudo apt-get update

This command updates the package list to ensure you have the latest version available. 2.

Type the following command to install the default JRE:

sudo apt-get install default-jre

This command will download and install the default Java runtime environment. 3.

If you require the JDK, type the following command:

sudo apt-get install default-jdk

This command will download and install the default Java development kit.

Install Java on CentOS

1. Open a terminal and type the following command:

sudo yum update

This command updates the package list to ensure you have the latest version available. 2.

Type the following command to install the default JRE:

sudo yum install java-1.8.0-openjdk

This command will download and install the default Java runtime environment. 3.

If you require the JDK, type the following command:

sudo yum install java-1.8.0-openjdk-devel

This command will download and install the default Java development kit.

Conclusion

In conclusion, Java is a versatile programming language that can be used to build a wide range of applications on Linux. Understanding Java versioning and how to check the version installed on your machine is essential for maintaining and upgrading your applications.

Installing Java on Linux is a straightforward process, and the steps may vary depending on your distribution. By following the steps outlined in this article, you can easily install and switch between multiple versions of Java on your Linux machine.

In summary, this article discussed Java versioning, checking Java version, multiple Java installations, and installing Java on Linux. It is essential to understand Java versioning and how to check the version installed on your machine to maintain and upgrade your applications.

The process of installing Java on Linux varies depending on the distribution used. Remember to update the package list to ensure you have the latest version available.

The ability to install and switch between multiple versions of Java on your Linux machine is an essential skill for building scalable and secure applications. By following the steps outlined in this article, you can easily install and work with Java on your Linux machine.

Popular Posts