Implemented in the Java Desktop Application Developer Track of hyperskill.org JetBrain Academy.

Project goal is to beta test this new Jetbrains project and give feedback to the authors.

• Java 20
• Lombok
• Slf4j
• Tests with Junit-Jupiter and Mockito
• Awaitility
• Gradle 8.1.1

The application will provide a simplified version of a traffic lights system for a road junction in which many roads converge to one.

Project was completed on 14.05.23.

Sources for all project tasks (6 stages) with tests and configurations.

13.05.23 Project started. Setup of build and repo with gradle on Kotlin basis.

13.05.23 Stage 1 completed. Just print outs.

13.05.23 Stage 2 completed. A simple integer value menu and introduced a model class for traffic lights.

13.05.23 Stage 3 completed. Input validation with regex and invalidAction-Runnable on Integer-queries. Console clearing via OS-ProcessBuilder.

13.05.23 Stage 4 completed. Added SystemTimer on basis of java.util.Timer. Used Awaitility-library for timing unit tests

13.05.23 Stage 5 completed. Circular queue for the roads implemented with ArrayDeque and added to TrafficLights. SystemTimer outputs roads in its state display.

14.05.23 Final Stage 6 completed. Road-dependent interval count-downs. Complicated timer logic implemented in TrafficLights using inner Road class. Extensive unit tests.