I Inherited a 40,000-Line Java File. Here's What I Found Inside.

description: A developer's case study of inheriting and refactoring a 40,000-line Java Swing file in a production hospital system — without rewriting it. For six months, one application slowed down my work every single day. Every morning I'd open the hospital management system, wait for it to load, and mutter something unkind under my breath. My colleagues did the same. We blamed the database. We blamed the old servers. We blamed Java Swing for being Java Swing. Then one afternoon I opened the s