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自动选题[tech]: 20210807 How to Install Java on Fedora Linux
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sources/tech/20210807 How to Install Java on Fedora Linux.md
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[#]: subject: "How to Install Java on Fedora Linux"
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[#]: via: "https://itsfoss.com/install-java-fedora/"
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[#]: author: "Abhishek Prakash https://itsfoss.com/author/abhishek/"
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[#]: collector: "lujun9972"
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[#]: translator: " "
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[#]: reviewer: " "
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[#]: publisher: " "
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[#]: url: " "
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How to Install Java on Fedora Linux
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======
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Love it or hate it, it is difficult to avoid Java.
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Java is still a very popular programming language taught in the schools and used in the enterprises.
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If you want to use a Java-based tool or program in Java, you’ll need to have Java on your system.
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This becomes confusing because there are so many technical terms around java.
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* Java Development Kit (JDK) for creating Java programs
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* Java Runtime Environment (JRE) or Java Virtual Machine (JVM) for running Java programs
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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.
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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.
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It is up to you to decide which Java version you want.
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### Installing Java on Fedora Linux
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First thing first, check if Java is already installed and which version it is. I am not kidding. Fedora usually comes with Java preinstalled.
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To check, use the following command:
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```
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java -version
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```
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As you can see in the screenshot below, I have Java 11 (OpenJDK 11) installed on my Fedora system.
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![Check Java version][3]
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Let’s say you want to install another version of Java. You may check the available options with the following command:
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```
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sudo dnf search openjdk
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```
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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.
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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.
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![Available Java versions in Fedora][4]
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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:
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```
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sudo dnf install java-1.8.0-openjdk.x86_64
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```
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![Install Java Fedora][5]
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That’s good. Now you have both Java 11 and Java 8 installed on your system. But how will you use one of them?
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#### Switch Java version on Fedora
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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:
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```
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sudo alternatives --config java
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```
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You’ll notice a number before the Java versions. The + sign before the Java versions indicate the current Java version in use.
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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.
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![Switching between installed Java versions][6]
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That’s all you need to do for installing Java on Fedora.
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--------------------------------------------------------------------------------
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via: https://itsfoss.com/install-java-fedora/
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作者：[Abhishek Prakash][a]
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选题：[lujun9972][b]
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译者：[译者ID](https://github.com/译者ID)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]: https://itsfoss.com/author/abhishek/
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[b]: https://github.com/lujun9972
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[1]: https://openjdk.java.net/
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[2]: https://www.oracle.com/java/technologies/javase-downloads.html
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[3]: https://i1.wp.com/itsfoss.com/wp-content/uploads/2021/08/check-java-version-fedora.png?resize=800%2C271&ssl=1
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[4]: https://itsfoss.com/wp-content/uploads/2021/08/available-java-versions-fedora-800x366.webp
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[5]: https://i0.wp.com/itsfoss.com/wp-content/uploads/2021/08/install-java-fedora.png?resize=800%2C366&ssl=1
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[6]: https://i1.wp.com/itsfoss.com/wp-content/uploads/2021/08/switch-java-versions-fedora.png?resize=800%2C513&ssl=1
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