Abstract supertype of objects which may or may not
contain one of more other values, called elements.
Container does not satisfy
Category, because it is
conceptually possible to have a container where the
contains() operation is prohibitively inefficient.
Container does not define a size, since it is possible
to have a container of infinite or uncomputable size.
shared formal Boolean empty
Determine if the container is empty, that is, if it has no elements.
|Attributes inherited from: Object|