Class Diagram

Notation

Access Modifiers

Relations (Arrows)

Association

Class1 and Class2 is related in some way
Can also have a no fill arrow to show the direction

Inheritance

SubClass1 and SubClass2 both inherit from SuperClass

Aggregation

Class1 is part of Class2
(The one with the diamond is part of, the aggregated)

Composition

Class1 cannot exist withou Class2 and vice versa

Realization

The Person and Corporation class implements the Owner interface

Dependency

Class1 depends on Class2
Class1 has a method with Class2 as the parameter