Is this an interface in java?

Good I have a doubt about how I see that sometimes they declare variables in a way that I never saw, that is, I am used to declare variables of type: int , String , double , long , char , float , etc. But I do not understand when they declare like this:

Codigo codigoDeSeguridad;

jugador jugador1;

because if I put it in eclipse I get an error.

I do not know if that is called an interface, and if so, what is an interface in java?