!"#%$'& (*)+'&*,)%&-

."/1032'0 4 5603798:

?

@ ACBED FG H I JLK

M N O#PRQTSUVWVXUY

" { Cn

T `op~=CW+ gyop

[gf+ g`i

++1n

nX"

6+ +z`op

`1%"yo[

|

" { Cn

T gp=R ~' %x p n

"#g{f' gf

p-{

[%j1g [ R

" #%$&')(

*

+ ,%-./)0

1 23456 758592;: 2

? @

4A6CBDFEHG4 >IEKJL6

? M

2N N =JEOB7P>4 EO3Q4R76 >2 2>I4DS6

T

I4DU4VW2XDY4Z[7;6\ Ic4 N 2Q6d> 7eefDU2efDFE)7A>4 3E)7RL Dg7N h

? @

2 ` Ii7AjR4 >Ic4 DFEOLkIP> 594j45 2V B2kN e594lQEm>nDo7RBb>pEO2kJih

q rsbt8uvfw

? xzy|{c}~y {R

v

}

?

vv

t

y

t8

v

%k )

]A H nA kg PCFH

bm nP K

k 8 9K P

)R g

)R g

8OgApk )Rko

kRA )kg

anF k

); F

Xb n

)A YfUP]P P;QX HR

Animal

CatPerson

RSPCA InspectorPoliceman

Xb n

Animal

CatPerson

RSPCA InspectorPoliceman

! #"$&%

' ()(+*-,.0/213.4*65

CatPerson

CatPerson

CatPerson

1 *

owner

pet

7 8:9

.;1=

? @BACA? D @BACAED F AGAGH D6AGA?

IJI

K LMNN OPM!Q#R$M&S N

T U:V WX UY)YZ-[\0U6]3\^Z_

CatPerson feeds

`a

b cdee fgd!h#i$d&j e

k llnmpoql!r2s3t4u6v wxzy {|u6} ~uts3t^uv

Car Engine

Wheel

1 1

1

4

Tooth Enamel

Filling

1 1

1

*

!#$&

3^6$ z 63^

Car+fuel: float+make: String = nissan+drive(direction:)+getSpeed(): int

!#$&

nJ :: ;6 +z

These Objects are allof class Cat

:Cat :Cat

hungry=true

felix:Cat felix

$& &! #$B

-062

Car Engine

WheelThese diagrams show views of the samesystem

1 1

1

4

:Car

:Wheel

:Engine

:Wheel

:Wheel

:Wheel :Car:Wheel

:Engine

2 B &0

0) 0-

Person

Policeman RSPCA Inspector

Catfeeds

! #"

$%

& '()*+ *,-. /0*

1324657298;:?@BA?DC

:Cat:Person :Policeman:RSPCA Inspector

kick()report(Man)

report(Person, Cat)

arrest()

EF

G HIJKL KMNO PQK

R3ST6U7S9V;W

a bcdef eghi jke

lnmpoqorstmvurpwyxqmz {;xr9|Bur}

~

6pp D

:Cat:Person :Policeman:RSPCA Inspector

kick()report(Man)

report(Person, Cat)

arrest()

BookmakerloseBet()

6

; Dvt! ;

t

t

qB B

BD tB;

pq3 q 73

D6 t 9

!"#$

%&'(*)+,-.

/ 013234 $&

576

8 9;:

=