7/23/2019 03. OOP Inheritance and Abstraction Homework

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Homework: Inheritance and Abstraction This dou'ent denes the ho'ework assign'ents fro' the **P !ourse + Software

University. Please su,'it as ho'ework a single zip  - rar  - 7z arhive holding the solutions

(soure ode) of all ,elow desri,ed ro,le's. The solutions should ,e written in !/.

Problem 1. Human, Studentand Worker

0ene an abstract lass Human holding a rst name and a last name.

• 0ene a lass Student derived fro' Human that has a eld !acult" number  ("1

digits - letters).

• 0ene a lass Worker  derived fro' Human  with elds WeekSalar"  and

WorkHoursPer#a" and 'ethod $one"PerHour%& that returns the ay'ent earned

,y hour ,y the worker.

• 0ene the roer onstrutors and roerties for the lasses in your lass hierarhy.

•

3nitiali4e a list of 1 students and sort the' ,y faulty nu',er in asending order (usea 53%6 7uery or the 'rder("%& e8tension 'ethod). 3nitiali4e a list of 1 workers and

sort the' ,y ay'ent er hour in desending order.

• 9erge the lists and then sort the' ,y rst na'e and last na'e.

Problem ). Animals!reate an abstract lass Animal holding na'e age and gender.

• !reate a hierarhy with lasses #o* +ro* at -itten and omcat. 0ogs frogs and

ats are ani'als. ;ittens are fe'ale ats and To'ats are 'ale ats. 0ene useful

onstrutors and 'ethods.

• 0ene an interfae ISoundProducible whih holds the 'ethod ProduceSound%&. &ll

ani'als should i'le'ent this interfae. The ProduceSound%&  'ethod should

rodue a sei sound deending on the ani'al invoking it (e.g. the dog should

,ark).

• !reate an array of di<erent kinds of ani'als and alulate the average age of eah

kind of ani'al using 53%6.

Problem /. ompan"

Hierarch"!reate the following **P lass hierarhy:

•   Person = general lass for anyone holding id rst name and last name.o   0mplo"ee  = general lass for all e'loyees holding the eld salar" and

department. The deart'ent an only ,e one of the following: Production

Accountin* Sales or $arketin*.   $ana*er = holds a set of emplo"ees under his o''and.

  e*ular0mplo"ee

-   Sales0mplo"ee  = holds a set of sales. & sale holds product

name date and price.-   #e2eloper  = holds a set of pro3ects. & ro>et holds pro3ect

name pro3ect start date details and a state (open or closed ).& ro>et an ,e losed through the 'ethod losePro3ect%&.

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o   ustomer  = holds the net purchase amount (total a'ount of 'oney the

usto'er has sent).

?8trat inter!aces for eah lass. (e.g. IPerson I0mplo"ee I$ana*er et.) The interfaes

should hold their u,li roerties and 'ethods (e.g. IPerson should hold id rst name and

last name). ?ah lass should i'le'ent its resetive interfae.

0ene roer onstrutors. &void ode duliation through a,stration. ?nasulate all data

and validate the inut. Throw e8etions where neessary. *verride oStrin*%& in all lasses

to rint detailed infor'ation a,out the o,>et.

!reate several e'loyees of tye 9anager Sales?'loyee and 0eveloer and add the' in a

sin*le olletion. Finally rint the' in a for"eah loo.