1. WARNING
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2. Let’s talk about the Evolution of (Wo)man…
wants to date
wants to date * * * *
Man
wants to date
wants to date
Woman * * *
wants to date *

3. On with our lecture proper
Assume we are building an online dating app. It allows users to indicate which other users they want to date.
The following class diagram shows the ‘wants to date’ associations.
Can the design be simplified?
wants to date
wants to date * *
wants to date * *
Man
Woman * * *
wants to date *

4. wants to date *
Person *
Man
Woman

5. wants to date *
Person
WantsToDate *
Man
Woman

6. 1 *
Person
WantsToDate
target
requestor 1 *
Man
Woman

7. w4:WantsToDate w1:WantsToDate w2:WantsToDate w3:WantsToDate jerry:Man
target
requestor
requester
target
target
requestor
jerry:Man
tom:Man
minnie:Woman
requestor
mickey:Man
target

8. 76767 OR tinyurl.com/answerpost
:MSLogic
:Timer
:ScoreCard
:Minefield
:Cell
:Mine
:Score a b
:MSLogic
:Minefield
Which one is a behavior diagram?
(as opposed to a structure diagram)
diag {a|b|c}
e.g. diag c
MSLogic
Minefield
Cell
ScoreCard
Mine
Timer
Score
feed2103 blah… c
OR tinyurl.com/answerpost
:Cell
:Cell

9. :Cell
:Cell

10. :Cell
:Cell

11. Object diagram
Sequence diagram
[some period]
[moment]
Class diagram
[all the time]
:Cell
:Cell

12. Interface Segregation Principle
Why not full disclosure?
Can your friends be trusted ?
Your parents want to know?
Parents
Friends
BF/GF
BF/GF
Examples/analogies helps you to understand/remember, but don’t forget the concept.

13. <<interface>> Debtor <<interface>> Graded
//... }
interface Client{
interface Payee extends Debtor, Client {
class Person {
class Student extends Person implements Payee, Graded{
Person
<<interface>>
Debtor
<<interface>>
Graded
<<interface>>
Client
<<interface>>
Payee
Student

14. Time to git together with your team members!
master
Centralized workflow
Feature branch workflow
master
feature-foo
feature-abc …

15. Sync with upstream repo using the pull command. shared remote repo
origin
Sync with upstream repo using the pull command.
shared remote repo
your repo is outdated!
rebase your commits OR
Your repo
merge the two versions
A wild conflict can appear!