Day 21/90: Practice - Library management system
90 Day Java Challenge: Zero to Production
Today I wanted library management system to feel like a real engineering decision, not a syntax demo. The useful shift was using practice - library management system to keep domain rules separate from framework and storage details.
The checks that mattered were domain boundaries, dependencies that point the right way, and failure paths designed as early as the happy path.
The failure mode I was actively trying to avoid was spreading workflow rules across packages without a clear ownership model. Practice days are where library management system stops being theory. I wanted a version that could survive one more requirement without collapsing into copy-paste fixes.
That is the bar I want from this track: code that stays readable when requirements move, not just code that compiles today. I also want to keep tracing one concrete path through the code because that exposes weak assumptions faster than a larger demo.
Top comments (0)