{"id":1857,"date":"2024-06-04T19:02:13","date_gmt":"2024-06-04T13:32:13","guid":{"rendered":"https:\/\/hostingn.in\/academy\/?p=1857"},"modified":"2024-11-12T12:15:50","modified_gmt":"2024-11-12T06:45:50","slug":"how-to-install-java-in-ubuntu-20-04-using-terminal","status":"publish","type":"post","link":"https:\/\/hostingn.in\/academy\/how-to-install-java-in-ubuntu-20-04-using-terminal\/","title":{"rendered":"How To Install Java In Ubuntu 20.04 Using Terminal"},"content":{"rendered":"\n

Java is a crucial programming language and computing platform that underpins many modern applications and websites. Whether you’re a developer looking to run Java applications or someone who needs it for software dependencies, knowing how to install Java <\/a>on your system is essential. In this guide, we’ll walk you through the process of How to install Java in Ubuntu 20.04 using terminal, ensuring you have a smooth setup from start to finish.<\/p>\n\n\n\n

Prerequisites<\/strong><\/h3>\n\n\n\n

Before diving into the installation process, it’s important to prepare your system. First, ensure that your system is up-to-date by running the following commands:<\/p>\n\n\n\n

<\/circle><\/circle><\/circle><\/g><\/svg><\/span><\/path><\/path><\/svg><\/span>
sudo<\/span> <\/span>apt<\/span> <\/span>update<\/span> <\/span><\/span>\nsudo<\/span> <\/span>apt<\/span> <\/span>upgrade<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
You’ll need administrative privileges to install Java, so make sure you have sudo access. If you’re the only user on your system, you likely already have this access.<\/p>\n\n\n\n
Checking for Existing Java Installation<\/strong><\/h3>\n\n\n\n
Before installing Java, it’s a good idea to check if it’s already installed on your system. Open the terminal and type:<\/p>\n\n\n\n
<\/circle><\/circle><\/circle><\/g><\/svg><\/span><\/path><\/path><\/svg><\/span>
java<\/span> <\/span>-<\/span>version<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
If Java is installed, you’ll see the version information. If not, you’ll get a message saying that the command is not found.<\/p>\n\n\n\n
Installing Java on Ubuntu 20.04<\/a><\/strong><\/h3>\n\n\n\n
You have two main options for installing Java: OpenJDK and Oracle JDK.<\/p>\n\n\n\n
OpenJDK vs. Oracle JDK<\/strong><\/h4>\n\n\n\n
OpenJDK is the open-source implementation of the Java Platform, Standard Edition. Oracle JDK, on the other hand, includes some additional commercial features. For most users, OpenJDK is sufficient and easier to install via the Ubuntu package manager.<\/p>\n\n\n\n
Installing OpenJDK<\/strong><\/h4>\n\n\n\n
To install OpenJDK, run the following commands:<\/p>\n\n\n\n
Install OpenJDK 11 (LTS version):<\/strong><\/p>\n\n\n\n
    \n
  1. <\/li>\n<\/ol>\n\n\n\n
    <\/circle><\/circle><\/circle><\/g><\/svg><\/span><\/path><\/path><\/svg><\/span>
    sudo<\/span> <\/span>apt<\/span> <\/span>install<\/span> <\/span>openjdk<\/span>-<\/span>11<\/span>-<\/span>jdk<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
    Install OpenJDK 17 (latest version as of 2024):<\/strong><\/p>\n\n\n\n
    <\/circle><\/circle><\/circle><\/g><\/svg><\/span><\/path><\/path><\/svg><\/span>
    sudo<\/span> <\/span>apt<\/span> <\/span>install<\/span> <\/span>openjdk<\/span>-<\/span>17<\/span>-<\/span>jdk<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
    You can install both versions if needed, as we’ll cover managing multiple versions later.<\/p>\n\n\n\n
    Installing Oracle JDK<\/strong><\/h4>\n\n\n\n
    Oracle JDK requires you to download the package from the Oracle website and install it manually. Follow these steps:<\/p>\n\n\n\n
    Download the .tar.gz file from Oracle’s website.<\/strong><\/p>\n\n\n\n
    Extract the tarball:<\/strong><\/p>\n\n\n\n
      \n
    1. <\/li>\n<\/ol>\n\n\n\n
      <\/circle><\/circle><\/circle><\/g><\/svg><\/span><\/path><\/path><\/svg><\/span>
      tar<\/span> <\/span>-<\/span>xvf<\/span> <\/span>jdk<\/span>-<\/span>17<\/span>_linux<\/span>-<\/span>x64_bin<\/span>.<\/span>tar<\/span>.<\/span>gz<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
      Move the JDK to \/opt directory:<\/strong><\/p>\n\n\n\n
      <\/circle><\/circle><\/circle><\/g><\/svg><\/span><\/path><\/path><\/svg><\/span>
      sudo<\/span> <\/span>mv<\/span> <\/span>jdk<\/span>-<\/span>17<\/span> <\/span>\/<\/span>opt<\/span>\/<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
      Set Oracle JDK as default:<\/strong><\/p>\n\n\n\n
      <\/circle><\/circle><\/circle><\/g><\/svg><\/span><\/path><\/path><\/svg><\/span>
      sudo<\/span> <\/span>update<\/span>-<\/span>alternatives<\/span> <\/span>--<\/span>install<\/span> <\/span>\/<\/span>usr<\/span>\/<\/span>bin<\/span>\/<\/span>java<\/span> <\/span>java<\/span> <\/span>\/<\/span>opt<\/span>\/<\/span>jdk<\/span>-<\/span>17<\/span>\/<\/span>bin<\/span>\/<\/span>java<\/span> <\/span>1<\/span><\/span>\nsudo<\/span> <\/span>update<\/span>-<\/span>alternatives<\/span> <\/span>--<\/span>set<\/span> <\/span>java<\/span> <\/span>\/<\/span>opt<\/span>\/<\/span>jdk<\/span>-<\/span>17<\/span>\/<\/span>bin<\/span>\/<\/span>java<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
      Setting Up Java Environment Variables<\/strong><\/h3>\n\n\n\n
      To ensure Java runs properly, you need to set up environment variables.<\/p>\n\n\n\n
      Configuring JAVA_HOME<\/strong><\/h4>\n\n\n\n
      Find your Java installation path:<\/strong><\/p>\n\n\n\n
        \n
      1. <\/li>\n<\/ol>\n\n\n\n
        <\/circle><\/circle><\/circle><\/g><\/svg><\/span><\/path><\/path><\/svg><\/span>
        sudo<\/span> <\/span>update<\/span>-<\/span>alternatives<\/span> <\/span>--<\/span>config<\/span> <\/span>java<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
        Set JAVA_HOME in .bashrc or .profile:<\/strong><\/p>\n\n\n\n
        <\/circle><\/circle><\/circle><\/g><\/svg><\/span><\/path><\/path><\/svg><\/span>
        echo<\/span> <\/span>"<\/span>export JAVA_HOME=\/usr\/lib\/jvm\/java-11-openjdk-amd64<\/span>"<\/span> <\/span>>><\/span> <\/span>~\/<\/span>.<\/span>bashrc<\/span><\/span>\nsource<\/span> <\/span>~\/<\/span>.<\/span>bashrc<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
        Updating PATH Variable<\/strong><\/h4>\n\n\n\n
        Add Java to your PATH:<\/strong><\/p>\n\n\n\n
        <\/circle><\/circle><\/circle><\/g><\/svg><\/span><\/path><\/path><\/svg><\/span>
        echo<\/span> <\/span>"<\/span>export PATH=<\/span>\\$<\/span>PATH:<\/span>\\$<\/span>JAVA_HOME\/bin<\/span>"<\/span> <\/span>>><\/span> <\/span>~\/<\/span>.<\/span>bashrc<\/span><\/span>\nsource<\/span> <\/span>~\/<\/span>.<\/span>bashrc<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
          \n
        1. <\/li>\n<\/ol>\n\n\n\n
          Verifying the Installation<\/strong>. How To Install Java In Ubuntu 20.04 Using Terminal<\/h3>\n\n\n\n
          After setting up Java, you should verify the installation.<\/p>\n\n\n\n
          Check the Java version:<\/strong><\/p>\n\n\n\n
          <\/circle><\/circle><\/circle><\/g><\/svg><\/span><\/path><\/path><\/svg><\/span>
          java<\/span> <\/span>-<\/span>version<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
            \n
          1. <\/li>\n<\/ol>\n\n\n\n
            Run a simple Java program:<\/strong><\/p>\n\n\n\n
            <\/circle><\/circle><\/circle><\/g><\/svg><\/span><\/path><\/path><\/svg><\/span>
            public<\/span> <\/span>class<\/span> <\/span>HelloWorld<\/span> <\/span>{<\/span><\/span>\n    <\/span>public<\/span> <\/span>static<\/span> <\/span>void<\/span> <\/span>main<\/span>(<\/span>String<\/span>[]<\/span> <\/span>args<\/span>)<\/span> <\/span>{<\/span><\/span>\n        <\/span>System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>"<\/span>Hello, World!<\/span>"<\/span>)<\/span>;<\/span><\/span>\n    <\/span>}<\/span><\/span>\n}<\/span><\/span>\n<\/span><\/code><\/pre><\/div>\n\n\n\n
            Compile and run the program:<\/p>\n\n\n\n
            <\/circle><\/circle><\/circle><\/g><\/svg><\/span><\/path><\/path><\/svg><\/span>
            ```<\/span>bash<\/span><\/span>\njavac HelloWorld.java<\/span><\/span>\njava HelloWorld<\/span><\/span>\n```<\/span><\/span>\n<\/span><\/code><\/pre><\/div>\n\n\n\n
            Managing Multiple Java Versions<\/strong><\/h3>\n\n\n\n
            Sometimes you need multiple Java versions<\/a>. Ubuntu provides a way to manage this.<\/p>\n\n\n\n
            Install update-alternatives:<\/strong><\/p>\n\n\n\n
            <\/circle><\/circle><\/circle><\/g><\/svg><\/span><\/path><\/path><\/svg><\/span>
            sudo<\/span> <\/span>update<\/span>-<\/span>alternatives<\/span> <\/span>--<\/span>install<\/span> <\/span>\/<\/span>usr<\/span>\/<\/span>bin<\/span>\/<\/span>java<\/span> <\/span>java<\/span> <\/span>\/<\/span>usr<\/span>\/<\/span>lib<\/span>\/<\/span>jvm<\/span>\/<\/span>java<\/span>-<\/span>11<\/span>-<\/span>openjdk<\/span>-<\/span>amd64<\/span>\/<\/span>bin<\/span>\/<\/span>java<\/span> <\/span>1<\/span><\/span>\nsudo<\/span> <\/span>update<\/span>-<\/span>alternatives<\/span> <\/span>--<\/span>install<\/span> <\/span>\/<\/span>usr<\/span>\/<\/span>bin<\/span>\/<\/span>java<\/span> <\/span>java<\/span> <\/span>\/<\/span>usr<\/span>\/<\/span>lib<\/span>\/<\/span>jvm<\/span>\/<\/span>java<\/span>-<\/span>17<\/span>-<\/span>openjdk<\/span>-<\/span>amd64<\/span>\/<\/span>bin<\/span>\/<\/span>java<\/span> <\/span>2<\/span><\/span>\n<\/span><\/code><\/pre><\/div>\n\n\n\n
              \n
            1. <\/li>\n<\/ol>\n\n\n\n
              Switch between versions:<\/strong><\/p>\n\n\n\n
              <\/circle><\/circle><\/circle><\/g><\/svg><\/span><\/path><\/path><\/svg><\/span>
              sudo<\/span> <\/span>update<\/span>-<\/span>alternatives<\/span> <\/span>--<\/span>config<\/span> <\/span>java<\/span><\/span>\n<\/span><\/code><\/pre><\/div>\n\n\n\n
              Uninstalling Java<\/strong><\/h3>\n\n\n\n
              If you need to uninstall Java, follow these steps.<\/p>\n\n\n\n
              Removing OpenJDK<\/strong><\/h4>\n\n\n\n
              Uninstall OpenJDK:<\/strong><\/p>\n\n\n\n
              <\/circle><\/circle><\/circle><\/g><\/svg><\/span><\/path><\/path><\/svg><\/span>
              sudo<\/span> <\/span>apt<\/span> <\/span>remove<\/span> <\/span>openjdk<\/span>-<\/span>11<\/span>-<\/span>jdk<\/span><\/span>\nsudo<\/span> <\/span>apt<\/span> <\/span>remove<\/span> <\/span>openjdk<\/span>-<\/span>17<\/span>-<\/span>jdk<\/span><\/span>\n<\/span><\/code><\/pre><\/div>\n\n\n\n
                \n
              1. <\/li>\n<\/ol>\n\n\n\n
                Clean up residual files:<\/strong><\/p>\n\n\n\n
                <\/circle><\/circle><\/circle><\/g><\/svg><\/span><\/path><\/path><\/svg><\/span>
                sudo<\/span> <\/span>apt<\/span> <\/span>autoremove<\/span><\/span>\nsudo<\/span> <\/span>apt<\/span> <\/span>clean<\/span><\/span>\n<\/span><\/code><\/pre><\/div>\n\n\n\n
                Removing Oracle JDK<\/strong><\/h4>\n\n\n\n
                Remove Oracle JDK:<\/strong><\/p>\n\n\n\n
                <\/circle><\/circle><\/circle><\/g><\/svg><\/span><\/path><\/path><\/svg><\/span>
                sudo<\/span> <\/span>rm<\/span> <\/span>-<\/span>rf<\/span> <\/span>\/<\/span>opt<\/span>\/<\/span>jdk<\/span>-<\/span>17<\/span><\/span>\n<\/span><\/code><\/pre><\/div>\n\n\n\n
                  \n
                1. <\/li>\n<\/ol>\n\n\n\n
                  Update alternatives:<\/p>\n\n\n\n
                  <\/circle><\/circle><\/circle><\/g><\/svg><\/span><\/path><\/path><\/svg><\/span>
                  sudo<\/span> <\/span>update<\/span>-<\/span>alternatives<\/span> <\/span>--<\/span>remove<\/span> <\/span>java<\/span> <\/span>\/<\/span>opt<\/span>\/<\/span>jdk<\/span>-<\/span>17<\/span>\/<\/span>bin<\/span>\/<\/span>java<\/span><\/span>\n<\/span><\/code><\/pre><\/div>\n\n\n\n
                  Troubleshooting Common Issues<\/strong><\/h3>\n\n\n\n
                  Installation Errors<\/strong> on How To Install Java In Ubuntu 20.04 Using Terminal<\/h4>\n\n\n\n
                  If you encounter installation errors, check your internet connection and package manager settings. Ensure you’re using sudo for administrative tasks.<\/p>\n\n\n\n
                  Environment Variable Issues<\/strong><\/h4>\n\n\n\n
                  Ensure your JAVA_HOME and PATH variables are correctly set. Typographical errors can lead to issues.<\/p>\n\n\n\n
                  Common Fixes<\/strong><\/h4>\n\n\n\n
                  If Java commands aren’t recognized, double-check your PATH settings and ensure Java is correctly installed and configured.<\/p>\n\n\n\n
                  Conclusion<\/strong><\/h3>\n\n\n\n
                  Installing Java on Ubuntu 20.04 using the terminal is straightforward when you know the steps. Whether you choose OpenJDK or Oracle JDK, following this guide will help you set up your environment for Java development. Now, you’re ready to dive into the world of Java programming and explore the endless possibilities it offers.<\/p>\n\n\n\n
                  \n
                  How do I update Java on Ubuntu 20.04?<\/strong><\/p>\nYou can update Java by running sudo apt update<\/code> and sudo apt upgrade<\/code> if you’re using OpenJDK. For Oracle JDK, download the latest version from the Oracle website and follow the installation steps again.<\/cite><\/blockquote>\n\n\n\n
                  \n
                  Can I have both OpenJDK and Oracle JDK installed?<\/strong><\/p>\nYes, you can have both installed and switch between them using the update-alternatives<\/code> command.<\/cite><\/blockquote>\n\n\n\n
                  \n
                  <\/p>\n<\/blockquote>\n","protected":false},"excerpt":{"rendered":"
                  Java is a crucial programming language and computing platform that underpins many modern applications and websites. Whether you’re a developer looking to run Java applications or someone who needs it for software dependencies, knowing how to install Java on your system is essential. In this guide, we’ll walk you through the process of How to […]<\/p>\n","protected":false},"author":1,"featured_media":1902,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[15],"tags":[94],"class_list":["post-1857","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-other","tag-install-java-in-ubuntu-20-04-using-terminal"],"_links":{"self":[{"href":"https:\/\/hostingn.in\/academy\/wp-json\/wp\/v2\/posts\/1857","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/hostingn.in\/academy\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/hostingn.in\/academy\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/hostingn.in\/academy\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/hostingn.in\/academy\/wp-json\/wp\/v2\/comments?post=1857"}],"version-history":[{"count":37,"href":"https:\/\/hostingn.in\/academy\/wp-json\/wp\/v2\/posts\/1857\/revisions"}],"predecessor-version":[{"id":1986,"href":"https:\/\/hostingn.in\/academy\/wp-json\/wp\/v2\/posts\/1857\/revisions\/1986"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/hostingn.in\/academy\/wp-json\/wp\/v2\/media\/1902"}],"wp:attachment":[{"href":"https:\/\/hostingn.in\/academy\/wp-json\/wp\/v2\/media?parent=1857"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/hostingn.in\/academy\/wp-json\/wp\/v2\/categories?post=1857"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/hostingn.in\/academy\/wp-json\/wp\/v2\/tags?post=1857"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}