a collection of fields; a collection of methods; initial value
expressions for the fields; and initialization variables that
are bound to initialization arguments. In the context of the
class system, an object is a collection of bindings for fields
that are instantiated according to a class description. declares
(or inherits) a public method for each variable in the
interface; is derived from the class required by the interface,
if any; and specifically declares its intention to implement the
interface. A class can implement any number of interfaces. A
derived class automatically implements any interface that its
superclass implements. Each class also implements an implicitly-
defined interface that is associated with the class. The
implicitly-defined interface contains all of the class’s public
method names, and it requires that all other implementations of
the interface are derived from the class. A new interface can
extend one or more interfaces with additional method names; each
class that implements the e