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This is a desktop Address Book application. It has a GUI but most of the user interactions happen using a CLI (Command Line Interface). 
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It is a Java sample application intended for students learning Software Engineering while using Java as the main programming language. 
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It is written in OOP fashion. It provides a reasonably well-written code example that is significantly bigger (around 6 KLoC)than what students usually write in beginner-level SE modules. 
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What’s different from level 3: - 
A more sophisticated GUI that includes a list panel and an in-built Browser. 
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More test cases, including automated GUI testing. 
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Support for Build Automation using Gradle and for Continuous Integration using Travis CI. 
 
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Acknowledgements
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Some parts of this sample application were inspired by the excellent Java FX tutorial by Marco Jakob.