sclass AtomicCounter {
  volatile int counter;
  
  // statically get var handles
  private static final VarHandle vhCounter;
  static ctex {
    var l = MethodHandles.lookup();
    vhCounter = l.findVarHandle(AtomicCounter.class, "counter", int.class);
  }
  
  int incCounter aka inc() {
    ret (int) vhCounter.getAndAdd(this, 1)+1;
  }
}