=== Opposite lock order: a real deadlock, detected via ThreadMXBean ===
thread-1: holding lockA, waiting for lockB
thread-2: holding lockB, waiting for lockA
main: findDeadlockedThreads() detected 2 deadlocked threads
  thread-1 is blocked on java.lang.Object@5451c3a8, owned by thread-2
  thread-2 is blocked on java.lang.Object@49476842, owned by thread-1

=== Same lock order on both threads: no deadlock possible ===
thread-1 (fixed order): acquired both locks, done
thread-2 (fixed order): acquired both locks, done
main: both fixed-order threads finished, isAlive t1=false t2=false
done (the process exits here - the two deadlocked threads above never finish)