![]() 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. OpenJDK 64-Bit Server VM 18.Java is the most widely used programming language. OpenJDK Runtime Environment 18.9 (build 11+28) bash_profile) and then running each alias, now I’ve got OpenJDK 11 set up and ready to go! $ j11 bash_profile, I now have: alias j11="export JAVA_HOME=/usr/libexec/java_home -v 11 java -version"Īlias j10="export JAVA_HOME=/usr/libexec/java_home -v 10 java -version"Īlias j8="export JAVA_HOME=/usr/libexec/java_home -v 1.8 java -version" Updating my aliases to quickly switch versions in my. Once you’ve moved it there, java_home -V now shows the new JDK in place: $ /usr/libexec/java_home -Vġ1, x86_64: "OpenJDK 11" /Library/Java/JavaVirtualMachines/jdk-11.jdk/Contents/Home gz file to the same location would make sense. Knowing that your available JDKs are installed to /Library/Java/JavaVirtualMachines/ by default, moving the contents of the downloaded OpenJDK 11 dir from inside the. ![]() Library/Java/JavaVirtualMachines/jdk1.8.0_151.jdk/Contents/Home To switch between JDKs, use /usr/libexec/java_home -v version (e.g. usr/libexec/java_home -V: This lists all installed JDKs, which is shown below: $ /usr/libexec/java_home -Vġ0, x86_64: "Java SE 10" /Library/Java/JavaVirtualMachines/jdk-10.jdk/Contents/Homeġ.8.0_151, x86_64: "Java SE 8" /Library/Java/JavaVirtualMachines/jdk1.8.0_151.jdk/Contents/Home usr/libexec/java_home: This will show you where the current JDK home is, for example: /Library/Java/JavaVirtualMachines/jdk-10.jdk/Contents/Home If you’ve done any fiddling with different JDK versions on MacOS before, you’ve probably come across the ‘/usr/libexec/java_home’ utility, which composes a number of useful things relating to the JDK that you’re currently using in your PATH. Click here for my previous article about this utility and answers to this StackOverflow post, which includes one of the most extensive and useful guides to running different JDK versions on MacOS that I’ve seen. tar.gz for OpenJDK 11 directly from, there’s no obvious installation instructions (at least that I could find) on the OpenJDK website or in the.
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