== Using UML Diagrams

You can use (((PlantUML)))PlantUML extension

.UML http://plantuml.sourceforge.net/
[plantuml,target="uml-diagram"]
--
abstract class AbstractList
abstract AbstractCollection
interface List
interface Collection

List <|-- AbstractList
Collection <|-- AbstractCollection

Collection <|- List
AbstractCollection <|- AbstractList
AbstractList <|-- ArrayList

class ArrayList {
  Object[] elementData
  size()
}

enum TimeUnit {
  DAYS
  HOURS
  MINUTES
}

annotation SuppressWarnings
--

.UML http://plantuml.sourceforge.net/ditaa.html
[plantuml,target="ditaa-diagram"]
--
@startditaa
+--------+   +-------+    +-------+
|        +---+ ditaa +--> |       |
|  Text  |   +-------+    |diagram|
|Document|   |!magic!|    |       |
|     {d}|   |       |    |       |
+---+----+   +-------+    +-------+
    :                         ^
    |       Lots of work      |
    +-------------------------+
@endditaa 
--

.UML http://plantuml.sourceforge.net/ditaa.html
[plantuml,target="dot-diagram"]
--
@startdot
digraph foo {
  node [style=rounded]
  node1 [shape=box]
  node2 [fillcolor=yellow, style="rounded,filled", shape=diamond]
  node3 [shape=record, label="{ a | b | c }"]

  node1 -> node2 -> node3
}
@enddot
--
