At the end of this lesson, you will be able to:
- understand and use inheritance in OOP
- Inheritance
- Super class and sub class
- sub class gets all the "goodies" of the supper class
- demo of inheritance for Bicycle class
- the subclass inherits from the super class
class TandemBike(Bicycle)
- add the new field into the constructor
def __init__(self, gear, cadence = 0):
# private fields
Bicycle.__init__(self, gear, cadence = 0)
self.__seats = 2
- change any methods you need
- remember to call the base, don't copy code!
def current_state(self):
# returns the current state of the tandem bicycle as a string
# this varaible is local to this method
return_string = Bicycle.current_state(self) + ' # of seats: ' + str(self.__seats)
return return_string
- video review of OOP Inheritance here
- Add a second class, under your vehicle class called CubeVan
- as you know a cube van has a large box on the back used to move things in
- this box has a certain volume that is set when the van is built
- normal vehicles do not have this kind of storage space (a trunk is different)
- create a field that will hold the volume value
- it should be set to 400 (for 400 cu. ft. )
- you will also need to create a constructor and a ReadOnly Property in your class as well to handle the new property
- work on weekly assignment
- read over Using OOP, Chapter 9
- Computer Based Problem Solving
- "Class Diagrams Again" & "Polymorphism"