object or instance - a ``thing''
that occupies a region of memory.
class - a category of object. In Java, this is is
a type alongside the primitive types like int and
double.
instance variable - a piece of data that an object
remembers. For example, a window might remember where its located on the
screen and how big it is.
instance method - a behavior that an object can
be asked to perform. For example, a window might be asked to display
itself or to grow larger or smaller.
constructor method - a behavior used when a new
object is created. This will set up the instance variables of the object
to their initial values.