Answer by Antz for Why use getters and setters/accessors?

In an object oriented language the methods, and their access modifiers, declare the interface for that object. Between the constructor and the accessor and mutator methods it is possible for the developer to control access to the internal state of an object. If the variables are simply declared public then there is no way to regulate that access.And when we are using setters we can restrict the user for the input we need. Mean the feed for that very variable will come through a proper channel and the channel is predefined by us. So it's safer to use setters.