UML Class Diagram

The Unified Modelling Language (UML) shows the features and attributes of the system including operations and inter-relationships between classes.
The Class Diagrams are Basically used for:

• Analysing the requirements in the form of a model
• Depict detailed designs of object-oriented/based software
• Explore domain concepts in the form of a model

When your using a Class Diagram to describe a design you need to use a different style for each circumstance.