Volatile variables and other variables

Question

The following is from classical Concurency in Practice:

When thread A writes to a volatile variable and subsequently thread B reads t

Answer 1

It means if you write to ten non-volatile variable and write to a volatile one, all the non-volatile variables must be set before the volatile one.

If you read the volatile variable and all the non-volatile ones you can be sure that the order won't be swapped around.