metrics

Software package metrics https://en.wikipedia.org/wiki/Software_package_metrics#:~:text=Abstractness%20(A)%3A%20The%20ratio,indicating%20a%20completely%20abstract%20package.

Abstractness vs Instability: Neo4j Case study https://medium.com/javarevisited/abstractness-vs-instability-neo4j-case-study-c453f46a6ea5

urls: https://stackoverflow.com/questions/1031135/what-is-abstractness-vs-instability-graph https://snyk.io/learn/code-review/java-tools/ https://www.baeldung.com/checkstyle-java

books: Clean Code: A Handbook of Agile Software Craftsmanship https://medium.com/javarevisited/clean-architecture-a-must-read-software-design-book-for-developers-41189b8ca122 Clean Architecture: A Craftsman’s Guide to Software Structure and Design https://medium.com/javarevisited/clean-code-a-must-read-coding-book-for-programmers-9dc80494d27c

PMD Checkstyle