You need to be able to compile Java source code for this workshop. You can install OpenJDK here.
Once you download the repository and installed java, navigate to the folder in your command line and compile the java files
javac BSPTree.java
javac ImageCreator.java
javac Driver.java
The other java files aren't implemented yet so they may not compile.
Finally, you need to run the java files
java Driver
If it runs successfuly, an image called "grid.png" will appear in the folder. It will look like this: