I got tired of wrong Java memory diagrams. So I built my own visualizer.

Most Java memory diagrams miss the details that actually matter. Not the big concepts — but the subtle mental models that cause real confusion and bugs later. HashMap showing insertion order. GC appearing instant. String Pool floating outside the heap. LinkedList looking like one object instead of scattered nodes. I kept seeing students (and myself) get confused by these. So I built JavaMem — a browser-based Java memory visualizer that corrects these mistakes visually. What it does Type simplified Java into the editor, hit Run — and watch: Stack frames appear for each scope Heap objects render as draggable cards Animated SVG arrows connect references to objects GC plays out in two phases — eligible first, collected after a delay HashMap, TreeMap, LinkedHashMap each render differently to show ordering behavior String Pool sits inside the heap (because since Java 7, it does) No install. No npm. No backend. Just open index.html in your browser. Why it's different Every visual choice is de