CHAP 10 COSC 1010

procedural programming

writing programs made of functions that perform specific tasks

object-oriented programming

focused on creating objects

object

entity that contains data and procedures

encapsulation

combining data and code into a single object

data hiding

object’s data attributes are hidden from code outside the object

object reusability

the same object can be used in
different programs

data attributes

define the state of an object (clock object would have second, minute, + hour data attributes)

public methods

allow external code to manipulate the
object (set_time, set_alarm_time)

private methods

used for object’s inner workings

class

code that specifies the data attributes and
methods of a particular type of object (cookie cutter)

instance

an object created from a class (specific cookie)

class definition

set of statements that define a class’s
methods and data attributes (class Class_name:)

self parameter

required in every method in the class –
references the specific object that the method is working
on

new instance

call initializer method (My_instance=Class_Name()), then to call methods use My_instance.method()

initializer method

automatically executed when an
instance of the class is created (def __init__(self):)

hiding attributes

two underscores in front of attribute name (__current_minute)

instance attribute

belongs to a specific instance of a
class

object’s state

the values of the object’s attribute at a
given moment

__ str __ method

displays the object’s state, called when object is passed to the print function, vice versa

accessor methods

return a value from a class’s
attribute without changing it (get function)

mutator methods

store or change the value of a data
attribute (set function)

passing objects as arguments

sending an instance of a class (object) to a method

UML diagram

standard diagrams for graphically
depicting object-oriented systems (box divided into 3 sections)