Robotic Piano - Class Diagram

A class diagram is an illustration of the relationships and source code dependencies among classes in the Unified Modeling Language (UML).
In this context, a class defines the methods and variables in an object, which is a specific entity in a program or the unit of code representing that entity.
Class diagrams are useful in all forms of object-oriented programming (OOP).
The concept is several years old but has been refined as OOP modeling paradigms have evolved.

In a class diagram, the classes are arranged in groups that share common characteristics.
A class diagram resembles a flowchart in which classes are portrayed as boxes, each box having three rectangles inside.
The top rectangle contains the name of the class; the middle rectangle contains the attributes of the class; the lower rectangle contains the methods, also called operations, of the class.
Lines, which may have arrows at one or both ends, connect the boxes.
These lines define the relationships, also called associations, between the classes.

Class diagram

Benefits of class diagrams

You know exactly what you are getting.You will have lower development costs
Your software will behave as you expect it to Fewer surprises
The right decisions are made before you are given poorly written code. Less overall costs
We can develop more memory and processor efficient systems
System maintenance costs will be lower. Less relearning takes place
Working with a new developer will be easier.Communication with programmers and outside contractors will be more efficient