Java 9 modules - reducing coupling of modules

It's the example of reducing coupling of Java 9 modules. The repo contains four modules

• pl.tfij.java9modules.greetings.api - module with API.
• pl.tfij.java9modules.app - client consuming the API.
• pl.tfij.java9modules.greetings.standard - first implementation of API.
• pl.tfij.java9modules.greetings.conversational - second implementation of API.

To keep code simple, each module contains only one class with a one single-line method.

Included scripts allow to easily run the code. To compile the code just start a compile.sh script. Then execute the package.sh to build jar files. This script provides jar files to three dirs: mod, mods-conversational-greetings, mods-standart-greetings.

For each dir separate runs script is prepared:

• ./run-standart-greetings.sh runs the program with pl.tfij.java9modules.greetings.standard implementation of API at module path and print Hello, World!.
• ./run-conversational-greetings.sh runs the program with pl.tfij.java9modules.greetings.conversational implementation of API at module path and print Hi, World!.
• ./run.sh run the program with both implementations of API at module path. The output is not deterministic, it can be Hello, World! or Hi, World!.