Object-oriented Programming (OOP)

Object-oriented programming (or design) makes use of: Modularity: e.g. reusable components, class libraries, frameworks Inheritance / Layering / Abst...

Class Libraries They make use of open-closed principle which means that the class can be adapted / extended in derived classes (heirs) but their interface ...

Patterns in software systems turn up at different abstraction levels: Idioms: Usage of programming language features (depend on language) Design patterns...

Testable Components Classes are the starting point for testing since they are the ideal "unit" for it. Each class should be able to test itself. Production...

Motivation There are two extreme attitudes towards changing the design of software: Software engineer that never wants to refactor (If it ain't broken d...

Principles Class Libraries A class library is an assembly / collection of mostly individually usable classes. They are used to define types in the class l...

Object vs. Value Each type has either object or value semantics. This decision must be taken explicitly. Value A value describes abstract entities. Its i...