Hello World with Git

After all the installations and configuration we are ready to create the classic Hello World in Java. This Hello World will include using git and GitHub.

Git

Use the Hello World tutorial for detailed explanation on the below steps.

1. Create git repository on GitHub
   1. Name it hello-word
   2. Initialize with a README
2. Create a folder to keep git repositories on local machine
   1. mkdir ~/github
3. Clone the repository from GitHub to your local machine
   1. cd ~/github
   2. git clone https://github.com/<username>/hello-world

Hello World in Visual Studio Code

1. Open vscode
   1. cd ~/github/hello-world
   2. code .
2. Create Main.java
   1. Contents:

          public class Main {
              public static void main(String[] args) {
                  System.out.println("Hello, World!");
              }
          }
      

3. Compile and run from terminal
   1. javac Main.java && java Main
4. Run the code from vscode
   1. CTRL + F5 or use F5 to start a debug session
   2. Verify output in Debug Console
5. If everything worked then your Development Environment has been successfully configured.
6. Create a new commit with your Hello World code
   1. git add -all
   2. git commit --message "Hello World"
7. Push your code to GitHub
   1. git push origin master

Hello World in IntelliJ IDEA with Unit Testing

IntelliJ works best when used with Maven or Gradle. I will be using Gradle since I know more about it.

TestNG will be used for writing unit tests. Setting up TestNG can be a daunting task if you are not familiar with Java and Gradle, so to spare you time I have made a scaffold that works out of the box with Gradle. cos212-prac-scaffold can be found on GitHub.

1. Download and install IntelliJ IDEA
2. Create a directory for the scaffold
   1. mkdir ~/github/hello-world-test
3. Download the scaffold archive
   1. curl --location https://github.com/egeldenhuys/cos212-prac-scaffold/archive/master.tar.gz --output /tmp/master.tar.gz
   2. --location - Follow redirects
4. Extract the archive
   1. tar --extract --file /tmp/master.tar.gz --directory hello-world --strip-components 1
   2. --strip-components 1 will remove the first component in the path of the file that is being extracted. For example /cos212-prac-scaffold/README.md will be extracted to README.md instead of /cos212-prac-scaffold/README.md
5. Open ~/github/hello-world-test with IntelliJ
6. To be continued...