Do not worry, each object created from the Gunner class and from any other class that extends Attacker will have their own time fields

But that's not so complicated. It's just two variables (and you don't really need the time2 variable from what you've shown) and then the method with one if and then one line of code in the if. (Each instance that you create of a class will have it's own variables which is what you want.)

And how can other classes acces to the time of the gunner? until now I did it with Gunner.time1 becuase the time was public static int but now it doesn't work that way

You have multiple classes all running on the same reload time? (or each gun will have its own reload time) I don't see why you you're having more than one gunner or gun running on the same reload time.

The Gunner class is an extension of the Attacker class. Every object from any class that extends the Attacker class will get their own instance of any non-private, non-static field declared in the Attacker class. They even get the private ones; but do not have direct access to those fields.