PlantUML

Question 1

how to start and end a class/sequence diagram

Answer 1

@start

@end

Question 2

A

Answer 2

with A A – B appears above

–>so it seems that LHS is above RHS

Question 3

–|> means….
and
..|> means…

Answer 3

we are using –|> to mean extends, i.e. subclass: A extends B (dotted line, closed arrow head)
vs
..|> means implements, i.e. interface (solid line, closed arrow head)

Question 4

*–

Answer 4

composite A *– B
–>B is an attribute of A
A “has-a” B as a field/attribute
*– : solid line, closed diamond

Question 5

o–

Answer 5

aggregation A o– B
–>? not sure…maybe “is-a”, or dependent class?

o– : solid line, open diamond

Question 6

package

Answer 6

package "Classic Collections" #DDDDDD {
  Object gives nice card-looking outline of anything in {}
#DDDDDD  light grey

Question 7

class "This is a class" as class1 {blabla}
or
class class2 as "It works this way too" {blabla}

Answer 7

The diagram will have what is in quotes as the displayed text. The -as- classname can be used when giving the relationships

Question 8

class "This is a class" as class1 {blabla}
or
class class2 as "It works this way too" {blabla}

Answer 8

The diagram will have what is in quotes as the displayed text. The -as- classname can be used when giving the relationships
More useful for packages or components:
component “Book Genre” as genre {….}

Question 9

specific “spot”

Answer 9

spot is the term for the circulur icon --
class classname <> spotname (optional, appears in between <>)
1. class System << (S,#FF7700) Singleton >>
2. class Date << (D,orchid) >>

Question 10

scale 750 width

Answer 10

hm…can set the size of the diagram?

put at top, under @startuml

Question 11

packages style

Answer 11

makes the package appear graphically
example: package foo1 <> {}

<>  (a box)
<>
<>
<>
<>
<>

can also set all packages:
skinparam packagestyle <>

Question 12

default arrow orientation

Answer 12

By default, links between classes have two dashes – and are vertically oriented. It is possible to use horizontal link by putting a single dash (or dot) like this:
Room o- Student

Question 13

title

Answer 13

appears at top

Question 14

create styled relationship lines

Answer 14

@startuml
title Bracketed line style with label
class foo
class bar
bar1 : [bold]  
bar2 : [dashed]
bar3 : [dotted]
bar4 : [hidden]
bar5 : [plain] 

foo --> bar          : ∅
foo -[bold]-> bar1   : [bold]
foo -[dashed]-> bar2 : [dashed]
foo -[dotted]-> bar3 : [dotted]
foo -[hidden]-> bar4 : [hidden]
foo -[plain]-> bar5  : [plain]
@enduml

Question 15

together

Answer 15

can be used alone or with package, component

Question 16

ortho lines

Answer 16

skinparam linetype ortho