add project

Author: JoniVR

JavaVersionSwitcher.sh

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+#!/bin/bash
+
+# MIT License
+#
+# Copyright (c) 2018 Joni Van Roost
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in all
+# copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+
+if [ `id -u` -ne 0 ]
+then
+    echo "Permission denied. Please start with sudo."
+    exit 1
+fi
+
+echo "Select a Java version you want to use:"
+
+# Collect the folders in the array $folders
+folders=( /Library/Java/JavaVirtualMachines/* )
+
+# Enable extended globbing. This lets us use @(foo|bar) to
+# match either 'foo' or 'bar'.
+shopt -s extglob
+
+# Start building the string to match against.
+string="@(${folders[0]}"
+
+# Add the rest of the folders to the string
+for((i=1;i<${#folders[@]};i++))
+do
+    string+="|${folders[$i]}"
+done
+
+# Close the parenthesis. $string is now @(folder1|folder2|...|folderN)
+string+=")"
+
+# Show the menu. This will list all folders and the string "quit"
+select selected_java_version in "${folders[@]}" "quit"
+do
+    case $selected_java_version in
+    # If the choice is one of the folders (if it matches $string)
+    $string)
+        echo "Setting Java version from \"$selected_java_version\" as current version."
+        
+        # Loop through java versions again
+        for java_version in ${folders[@]}
+        do
+            # If there's no info.plist or info.plist.disabled file, notify the user.
+            if [ ! -f "$java_version/Contents/Info.plist" ] &&
+               [ ! -f "$java_version/Contents/Info.plist.disabled" ]
+            then 
+                echo "No Info.plist or Info.plist.disabled file found for $java_version. \n Please check this installation."
+                break
+            fi 
+
+            # When a java version does not match the selected version
+            # if there is an Info.plist file, rename -> Info.plist.disabled
+            if [ "$java_version" != "$selected_java_version" ] && 
+               [ -f "$java_version/Contents/Info.plist" ]
+            then
+                `mv $java_version/Contents/Info.plist $java_version/Contents/Info.plist.disabled`
+            
+            # When a java version matches the selected version
+            # if there is no Info.plist file but there is an Info.plist.disabled, rename -> Info.plist
+            elif [ "$java_version" == "$selected_java_version" ] && 
+                 [ ! -f "$selected_java_version/Contents/Info.plist" ] &&
+                 [ -f "$selected_java_version/Contents/Info.plist.disabled" ]
+            then 
+                 `mv $java_version/Contents/Info.plist.disabled $java_version/Contents/Info.plist`
+            fi
+        done 
+
+        break;
+        ;;
+
+    "quit")
+        # Exit
+        exit;;
+    *)
+        selected_java_version=""
+        echo "Please choose a number from 1 to $((${#folders[@]}+1))";;
+    esac
+done
+
+echo "Done!"
+
+exit 0

README.md

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+# JavaVersionSwitcher
+A bash script for easily switching which Java version your system should be using on macOS.
+
+![example](https://github.com/JoniVR/JavaVersionSwitcher/blob/master/example.png)
+
+## What is it?
+A script that will show you a list with currently installed Java versions on your system to pick one from to use.
+
+## How does it work?
+It works by renaming the `Info.plist` files of all other versions inside their respective `Library/Java/JavaVirtualMachines/jdk{version}.jdk/Contents/` folders to `Info.plist.disabled`, so that only the selected version will have an `Info.plist` file, this way, only the selected version will work.
+
+## How to use?
+1. Download or clone the script to your computer
+2. Open a terminal window, navigate to the location where you saved the file (`cd /<folder>/`)
+3. Run `chmod +x JavaVersionSwitcher.sh` to allow the user to run the script
+4. Run the script: `sudo ./JavaVersionSwitcher.sh`
+
+## Warning
+This script modifies your files (`Info.plist` files inside Java installation folders), this means that Java versions won't work unless you either run the script again and select a version or rename the `Info.plist.disabled` file to `Info.plist` inside `Library/Java/JavaVirtualMachines/jdk{version}.jdk/Contents/`. Use at your own risk.
+
+## Author
+Joni Van Roost, [email protected]
+
+## License
+JavaVersionSwitcher is available under the MIT license. See the [LICENSE](https://github.com/JoniVR/JavaVersionSwitcher/blob/master/LICENSE) file for more info.
+
+## More
+Feel free to submit a pull request, open an issue or fork this project. Any help is always appreciated.