Add Java installation guide for Linux

Author @drustanyjt
Contributed via #93

index.md

@@ -21,6 +21,7 @@ Tutorials, how-to guides, getting-started guides, ...
   * **[Installation](tutorials/javaInstallation.html)**
     * [**:fab-apple: Mac**](tutorials/javaInstallationMac.html)
     * [**:fab-windows: Windows**](tutorials/javaInstallationWindows.html)
+    * [**:fab-linux: Linux**](tutorials/javaInstallationLinux.html)
   * [**JAR files**](tutorials/jar.html)
   * [**JavaFX**](tutorials/javaFx.html):
     * [Part 1: Getting started](tutorials/javaFxPart1.html)

tutorials/javaInstallation.md

@@ -8,4 +8,4 @@
 
 * [**:fab-apple: Mac**](javaInstallationMac.html) -- If you are on a Mac and you anticipate using JavaFX in your projects, you are using the precise JDK specified in this guide.
 * [**:fab-windows: Windows**](javaInstallationWindows.html)
-* %%**:fab-linux: Linux**: coming soon ...%%
+* [**:fab-linux: Linux**](javaInstallationLinux.html)

tutorials/javaInstallationLinux.md

@@ -0,0 +1,64 @@
+{% set title="Java 17 Installation Guide for Linux Users" %}
+<frontmatter>
+  title: "{{ title }}"
+  pageNav: 2
+</frontmatter>
+
+# {{ title }}
+
+This guide explains how to install the **==[OpenJDK Java 17](https://openjdk-sources.osci.io/openjdk17/)==** on Linux using the command line. This guide was created using Ubuntu 22.04 but the steps for other Debian based Linux distros should be similar.
+This guide assumes you have super user access.
+
+
+## Installation
+
+* **Update APT repositories** {{ step_numbers }}
+   * First we need to ensure our apt repositories are updated. Enter the following command in your terminal: 
+     ```bash
+     sudo apt update && sudo apt upgrade
+     ```
+     Enter your password if prompted.
+* **Install JDK**
+   * Install the Java 17 OpenJDK version by running:
+     ```bash
+     sudo apt install openjdk-17-jdk 
+     ```
+     Note that the default installation location is usually `/usr/lib/jvm/`.
+* **Verify Installation**
+   * To verify the installation, run:
+     ```bash
+     java -version
+     ```
+
+<!-- ======================================================================= -->
+
+## Switching between Java versions
+
+If you have multiple versions of Java installed, you can switch between them using `update-alternatives`.
+
+* **To see the currently active Java version** run,
+  ```bash
+  java -version
+  ```
+* **To switch to a different installed version**, run the following command.
+  ```bash
+  sudo update-alternatives --config java
+  ```
+  You should see terminal output like this:
+  <img src="images/javaInstallationLinux/update_alternatives_java.png" style="padding: 10px;">
+
+  Follow the instructions to change to your desired version.
+  For example, to use Java 11 in the image above, type `1` into the terminal.
+* **If you don't have the desired version installed**, you can search for it by running the following command:
+  ```bash
+  sudo apt-cache search openjdk | grep "\-jdk"
+  ```
+  You should see the available OpenJDK Java versions listed like so:
+  <img src="images/javaInstallationLinux/list_openjdk_versions.png" style="padding: 10px;">
+  
+  Decide on one of the available versions and follow the same steps as above to install your desired Java version.
+
+--------------------------------------------------------------------------------
+
+**Authors:**
+* Initial Version: Drustan Yeo ([@drustanyjt](https://github.com/drustanyjt))