From 6b1d852f45c0142766fa4917ad69e28be452369c Mon Sep 17 00:00:00 2001 From: DarkSun Date: Sat, 7 Aug 2021 05:02:52 +0800 Subject: [PATCH] =?UTF-8?q?=E9=80=89=E9=A2=98[tech]:=2020210807=20How=20to?= =?UTF-8?q?=20Install=20Java=20on=20Fedora=20Linux?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit sources/tech/20210807 How to Install Java on Fedora Linux.md --- ...807 How to Install Java on Fedora Linux.md | 102 ++++++++++++++++++ 1 file changed, 102 insertions(+) create mode 100644 sources/tech/20210807 How to Install Java on Fedora Linux.md diff --git a/sources/tech/20210807 How to Install Java on Fedora Linux.md b/sources/tech/20210807 How to Install Java on Fedora Linux.md new file mode 100644 index 0000000000..f3f9a3ded1 --- /dev/null +++ b/sources/tech/20210807 How to Install Java on Fedora Linux.md @@ -0,0 +1,102 @@ +[#]: subject: "How to Install Java on Fedora Linux" +[#]: via: "https://itsfoss.com/install-java-fedora/" +[#]: author: "Abhishek Prakash https://itsfoss.com/author/abhishek/" +[#]: collector: "lujun9972" +[#]: translator: " " +[#]: reviewer: " " +[#]: publisher: " " +[#]: url: " " + +How to Install Java on Fedora Linux +====== + +Love it or hate it, it is difficult to avoid Java. + +Java is still a very popular programming language taught in the schools and used in the enterprises. + +If you want to use a Java-based tool or program in Java, you’ll need to have Java on your system. + +This becomes confusing because there are so many technical terms around java. + + * Java Development Kit (JDK) for creating Java programs + * Java Runtime Environment (JRE) or Java Virtual Machine (JVM) for running Java programs + + + +On top of that, you’ll come across [OpenJDK][1] and [Oracle Java SE][2]. OpenJDK is what is recommended because it is open source. If you have exclusive need then only you should go for Oracle Java SE. + +There is one more thing here. Even OpenJDK has several versions available. At the time of writing this article, Fedora 34 has OpenJDK 1.8, OpenJDK 11 and OpenJDK 16 available. + +It is up to you to decide which Java version you want. + +### Installing Java on Fedora Linux + +First thing first, check if Java is already installed and which version it is. I am not kidding. Fedora usually comes with Java preinstalled. + +To check, use the following command: + +``` +java -version +``` + +As you can see in the screenshot below, I have Java 11 (OpenJDK 11) installed on my Fedora system. + +![Check Java version][3] + +Let’s say you want to install another version of Java. You may check the available options with the following command: + +``` +sudo dnf search openjdk +``` + +The sudo here is not required but it will refresh the metadata for sudo user which will eventually help when you install another version of Java. + +The above command will show a huge output with plenty of similar looking packages. You have to focus on the initial few words to understand the different versions available. + +![Available Java versions in Fedora][4] + +For example, to install Java 8 (OpenJDK 1.8), the package name should be java-1.8.0-openjdk.x86_64 or java-1.8.0-openjdk. Use it to install it: + +``` +sudo dnf install java-1.8.0-openjdk.x86_64 +``` + +![Install Java Fedora][5] + +That’s good. Now you have both Java 11 and Java 8 installed on your system. But how will you use one of them? + +#### Switch Java version on Fedora + +Your Java version in use remains the same unless you explicitly change it. Use this command to list the installed Java versions on your system: + +``` +sudo alternatives --config java +``` + +You’ll notice a number before the Java versions. The + sign before the Java versions indicate the current Java version in use. + +You can specify the number to switch the Java version. So, in the example below, if I enter 2, it will change the Java version on the system from Java 11 to Java 8. + +![Switching between installed Java versions][6] + +That’s all you need to do for installing Java on Fedora. + +-------------------------------------------------------------------------------- + +via: https://itsfoss.com/install-java-fedora/ + +作者：[Abhishek Prakash][a] +选题：[lujun9972][b] +译者：[译者ID](https://github.com/译者ID) +校对：[校对者ID](https://github.com/校对者ID) + +本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出 + +[a]: https://itsfoss.com/author/abhishek/ +[b]: https://github.com/lujun9972 +[1]: https://openjdk.java.net/ +[2]: https://www.oracle.com/java/technologies/javase-downloads.html +[3]: https://i1.wp.com/itsfoss.com/wp-content/uploads/2021/08/check-java-version-fedora.png?resize=800%2C271&ssl=1 +[4]: https://itsfoss.com/wp-content/uploads/2021/08/available-java-versions-fedora-800x366.webp +[5]: https://i0.wp.com/itsfoss.com/wp-content/uploads/2021/08/install-java-fedora.png?resize=800%2C366&ssl=1 +[6]: https://i1.wp.com/itsfoss.com/wp-content/uploads/2021/08/switch-java-versions-fedora.png?resize=800%2C513&ssl=1