Object
is
a
reality
and
it
exist
in
____________________
forms
with
for
main
characteristics
.
Object
-
oriented
programming
is
an
approach
to
designing
modular
reusable
____________________
systems
.
The
object
-
oriented
approach
is
an
evolution
of
good
design
____________________
that
go
back
to
the
very
beginning
of
computer
programming
.
____________________
-
orientation
is
simply
the
logical
extension
of
older
techniques
such
as
____________________
programming
and
abstract
data
types
.
An
object
is
an
abstract
data
type
with
the
addition
of
polymorphism
and
____________________
.
Rather
than
structure
programs
as
code
and
data
,
an
object
-
oriented
system
integrates
the
two
using
the
____________________
of
an
"
____________________
"
.
An
object
has
state
(
data
)
and
behavior
(
code
)
.
Objects
can
correspond
to
things
found
in
the
real
world
.
So
for
example
,
a
graphics
program
will
have
objects
such
as
____________________
,
square
,
menu
.
An
online
shopping
system
will
have
objects
such
as
shopping
cart
,
customer
,
product
.
The
shopping
system
will
support
____________________
such
as
place
order
,
make
payment
,
and
offer
discount
.
The
objects
are
designed
as
class
hierarchies
.
So
for
example
with
the
shopping
system
there
might
be
high
level
classes
such
as
____________________
product
,
kitchen
product
,
and
book
.
There
may
be
further
refinements
for
example
under
electronic
products
:
CD
Player
,
DVD
player
,
etc
.
These
classes
and
____________________
correspond
to
sets
and
subsets
in
mathematical
logic
.
