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How to start developing on Java in Fedora
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======
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Java is one of the most popular programming languages in the world. It is widely-used to develop IOT appliances, Android apps, web, and enterprise applications. This article will provide a quick guide to install and configure your workstation using [OpenJDK][1].
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### Installing the compiler and tools
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Installing the compiler, or Java Development Kit (JDK), is easy to do in Fedora. At the time of this article, versions 8 and 9 are available. Simply open a terminal and enter:
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```
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sudo dnf install java-1.8.0-openjdk-devel
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```
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This will install the JDK for version 8. For version 9, enter:
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```
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sudo dnf install java-9-openjdk-devel
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```
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For the developer who requires additional tools and libraries such as Ant and Maven, the **Java Development** group is available. To install the suite, enter:
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```
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sudo dnf group install "Java Development"
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```
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To verify the compiler is installed, run:
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```
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javac -version
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```
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The output shows the compiler version and looks like this:
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```
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javac 1.8.0_162
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```
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### Compiling applications
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You can use any basic text editor such as nano, vim, or gedit to write applications. This example provides a simple “Hello Fedora” program.
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Open your favorite text editor and enter the following:
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```
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public class HelloFedora {
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public static void main (String[] args) {
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System.out.println("Hello Fedora!");
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}
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}
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```
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Save the file as HelloFedora.java. In the terminal change to the directory containing the file and do:
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```
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javac HelloFedora.java
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```
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The compiler will complain if it runs into any syntax errors. Otherwise it will simply display the shell prompt beneath.
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You should now have a file called HelloFedora, which is the compiled program. Run it with the following command:
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```
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java HelloFedora
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```
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And the output will display:
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```
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Hello Fedora!
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```
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### Installing an Integrated Development Environment (IDE)
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Some programs may be more complex and an IDE can make things flow smoothly. There are quite a few IDEs available for Java programmers including:
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+ Geany, a basic IDE that loads quickly, and provides built-in templates
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+ Anjuta
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+ GNOME Builder, which has been covered in the article Builder – a new IDE specifically for GNOME app developers
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However, one of the most popular open-source IDE’s, mainly written in Java, is [Eclipse][2]. Eclipse is available in the official repositories. To install it, run this command:
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```
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sudo dnf install eclipse-jdt
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```
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When the installation is complete, a shortcut for Eclipse appears in the desktop menu.
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For more information on how to use Eclipse, consult the [User Guide][3] available on their website.
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### Browser plugin
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If you’re developing web applets and need a plugin for your browser, [IcedTea-Web][4] is available. Like OpenJDK, it is open source and easy to install in Fedora. Run this command:
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```
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sudo dnf install icedtea-web
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```
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As of Firefox 52, the web plugin no longer works. For details visit the Mozilla support site at [https://support.mozilla.org/en-US/kb/npapi-plugins?as=u&utm_source=inproduct][5].
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Congratulations, your Java development environment is ready to use.
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--------------------------------------------------------------------------------
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via: https://fedoramagazine.org/start-developing-java-fedora/
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作者：[Shaun Assam][a]
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选题：[lujun9972](https://github.com/lujun9972)
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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://fedoramagazine.org/author/sassam/
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[1]:http://openjdk.java.net/
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[2]:https://www.eclipse.org/
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[3]:http://help.eclipse.org/oxygen/nav/0
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[4]:https://icedtea.classpath.org/wiki/IcedTea-Web
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[5]:https://support.mozilla.org/en-US/kb/npapi-plugins?as=u&utm_source=inproduct
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@ -0,0 +1,122 @@
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如何在 Fedora 上开始 Java 开发
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======
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Java 是世界上最流行的编程语言之一。它广泛用于开发物联网设备、Android 程序，Web 和企业应用。本文将提供使用 [OpenJDK][1] 安装和配置工作站的指南。
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### 安装编译器和工具
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在 Fedora 中安装编译器或 Java Development Kit（JDK）很容易。在写这篇文章时，可以用 v8 和 v9。只需打开一个终端并输入：
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```
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sudo dnf install java-1.8.0-openjdk-devel
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```
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这安装 JDK v8。对于 v9，请输入：
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```
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sudo dnf install java-9-openjdk-devel
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```
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对于需要其他工具和库（如 Ant 和 Maven）的开发人员，可以使用 **Java Development** 组。要安装套件，请输入：
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```
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sudo dnf group install "Java Development"
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```
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要验证编译器是否已安装，请运行：
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```
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javac -version
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```
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输出显示编译器版本，如下所示：
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```
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javac 1.8.0_162
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```
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### 编译程序
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你可以使用任何基本的文本编辑器（如 nano、vim 或 gedit）编写程序。这个例子提供了一个简单的 “Hello Fedora” 程序。
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打开你最喜欢的文本编辑器并输入以下内容：
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```
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public class HelloFedora {
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public static void main (String[] args) {
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System.out.println("Hello Fedora!");
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}
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}
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```
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将文件保存为 HelloFedora.java。在终端切换到包含该文件的目录并执行以下操作：
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```
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javac HelloFedora.java
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```
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如果编译器遇到任何语法错误，它会发出错误。否则，它只会在下面显示 shell 提示符。
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你现在应该有一个名为 HelloFedora 的文件，它是编译好的程序。使用以下命令运行它：
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```
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java HelloFedora
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```
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输出将显示：
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```
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Hello Fedora!
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```
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### 安装集成开发环境（IDE）
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有些程序可能更复杂，IDE 可以帮助顺利进行。Java 程序员有很多可用的 IDE，其中包括：
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+ Geany，一个加载快速的基本 IDE，并提供内置模板
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+ Anjuta
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+ GNOME Builder，已经在 Builder 的文章中介绍过 - 这是一个专门面向 GNOME 程序开发人员的新 IDE
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然而，主要用 Java 编写的最流行的开源 IDE 之一是 [Eclipse][2]。 Eclipse 在官方仓库中有。要安装它，请运行以下命令：
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```
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sudo dnf install eclipse-jdt
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```
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安装完成后，Eclipse 的快捷方式会出现在桌面菜单中。
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有关如何使用 Eclipse 的更多信息，请参阅其网站上的[用户指南][3]。
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### 浏览器插件
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如果你正在开发 Web 小程序并需要一个用于浏览器的插件，则可以使用 [IcedTea-Web][4]。像 OpenJDK 一样，它是开源的并易于在 Fedora 中安装。运行这个命令：
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```
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sudo dnf install icedtea-web
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```
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从 Firefox 52 开始，Web 插件不再有效。有关详细信息，请访问 Mozilla 支持网站 [https://support.mozilla.org/en-US/kb/npapi-plugins?as=u&utm_source=inproduct][5]。
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恭喜，你的 Java 开发环境已准备完毕。
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--------------------------------------------------------------------------------
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via: https://fedoramagazine.org/start-developing-java-fedora/
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作者：[Shaun Assam][a]
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选题：[lujun9972](https://github.com/lujun9972)
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译者：[geekpi](https://github.com/geekpi)
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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://fedoramagazine.org/author/sassam/
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[1]:http://openjdk.java.net/
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[2]:https://www.eclipse.org/
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[3]:http://help.eclipse.org/oxygen/nav/0
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[4]:https://icedtea.classpath.org/wiki/IcedTea-Web
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[5]:https://support.mozilla.org/en-US/kb/npapi-plugins?as=u&utm_source=inproduct
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