SYSTEM DEEP DIVE Prep indexFiguresProgress

See how it actually works.

Run real code. Watch the figure react. Keep one picture per concept, the one you'll redraw in the interview.

Dive in
STACK HEAP x · int5 y · int5 d · Dog 0x1F4A d2 · Dog 0x1F4A Dog @ 0x1F4A name = "Rex"
OPEN Dog
Memory & references
main() a() b() ?
The call stack
.java .class JVM
How Java runs
OPEN s1 s2 "hi" the pool
Strings & the pool
hash
HashMap internals
ArrayList growth
catch
Exceptions & unwinding
root unreachable
Garbage collection
thread Athread B
Threads & the scheduler
Core A Core B main memory
volatile & the memory model
yourBean proxy
Proxies & @Transactional
0123 grp A grp B
Kafka: the log
Plus 33 more figures in the pipeline. Every one built like the first: run it, watch it, keep the picture.