I built a free Java practice playground with a built-in compiler — here's what I learned (and what's inside)

I built a free Java practice platform because everything else was broken After helping a few friends learn Java, I kept hitting the same wall: Every “practice Java online” site is either: paywalled full of ads or only focused on LeetCode-style puzzles that don’t actually help you write Java So I built Java Practice Lab — a free, no-signup playground with: 250+ real-world Java problems Monaco-based editor standalone Java 17 online compiler This post is half a write-up of what I learned, half a re