class diagrams

Question 1

class name should be singular / plural?

Answer 1

singular

Question 2

attributes should be private or public ?

Answer 2

private (unless qn specifically says otherwise)

Question 3

methods should be private or public ?

Answer 3

public

Question 4

what methods to implement? (in class diagram)

Answer 4

for all attributes (values):
- getters & setters for all
- if attributes X specifically required to be added by qn, usually dn, should be calc__ instead)

for all attributes (data structures):
- add, remove, find for all

when computation involved, add method instead of attribute

PSSS find out purpose of class such that the main purpose must be a method inside the superclass.
(eg payment application. calculatePayment() MUST be in super class)

Question 5

how should the link between parent and child class look like on the diagram?

Answer 5

arrow (hollow triangle pointing upwards)

Question 6

how should subclass be implemented?

Answer 6

classes with different purposes (eg. read&write) should be split into two diff subclasses

(subclass can have 0 attributes/methods)