![]() Enter the number which you want to keep as a default Java version and press Enter. The prompt will display on the terminal that will ask you to enter the choice number which Java version you want to set as default. The list of installed Java versions is presented in the terminal window. You will see the following output on your system: Now, to change the default Java version using the update-alternatives command as follows: $ sudo update-alternatives -config java If multiple Java versions are installed on your system Ubuntu 20.04, then you can check the default Java version using the command as follows: $ Java -version So, after that you can Java version using the following command: $ Java -version Set the default Java version on Ubuntu 20.04 Some older java applications might require the previous Java version If your application requires the JDK-8 version then you can install it using the following command: $ sudo apt install openjdk-8-jdkĪfter executing the above command, the Java JDK-8 installation will begin on your system and it will take some time to complete the installation process. Now, you can check the installed version using the following command: $ Java -version Install Java 8 JDK The above command will install the default version of Java JDK-11 on your system. If Java is not installed on your system then use the following command to install the Java JDK. If Java is already installed on your system, then the following output will be displayed on your terminal window:īy default, Ubuntu 20.04 includes the Java 11 JDK. Now, check that Java is installed on your system or not using the following command: $ Java -version To start the installation of Java on Ubuntu 20.04 first, you need to update the apt repository on your system using the following command: $ sudo apt update Open the terminal on your system using ‘Ctrl + Alt+ t’ or through the application search bar as follows: All commands and steps in this article are performed on the Ubuntu 20.04 Linux system listed below. This article shows how to install Java 8 and Java 11 JDK and JRE on Ubuntu 20.04 using the terminal and how to switch between these two versions. Java is open source and has two flavors: the JDK (Java Development Kit), which is required if you want to develop Java applications, and the JRE (Java Runtime Environment), which is used to run Java applications and does not include compilers and development tools. Java applications are also used on game consoles and cell phones, for example, the Android operating system uses Java as an app programming language. It can be used to create server and desktop applications, and Java runs on almost all operating systems, including Mac OS, Windows, and Linux. However, it is important to note that it's not the dedicated solution in developing the applications, that's the job of JDK.Java is the most widely used programming language. It can effortlessly be downloaded and installed on your 64-bit Windows computer which will best cater to its needs as compared to the 32-bit version. Essential PC development packageĪs mentioned, Java Runtime Environment 64 offers the necessary utilities to be able to run any Java-based desktop app or web applet. Running 32-bit Java on 64-bit Windows will cause compromises such as update issues. Remember that this version of Java Runtime Environment is only for 64-bit machines. If you need to configure any option regarding JRE, just go to the Control Panel tab and you will find a Java icon that can give you access to a fully-featured Java Control Panel. You must close all the opened applications including the browser ahead of the installment. ![]() It is important to note that when saving the file, it is more advisable to store it in a known location for easy visibility. Moreover, the executable file can also be copied to a computer that has no network connection. The entire installation process doesn't need to remain connected to the internet. A few clicks on the "Next" button and Java will be installed on your computer in no time. The process hardly takes a few minutes to integrate Java in your system and in all main web browsers like Microsoft Edge or Mozilla Firefox as well. However, before proceeding, you must have administrator access to your Windows desktop. Installing Java Runtime Environment 64 on your system is extremely easy.
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