Fundamental Knowledge

Object-Oriented Programming

• Encapsulation
• Composition, inheritance, and delegation
• Polymorphism
• Objects and classes
• Open recursion

Source: Wikipedia

Code Refactoring

• Target
  • Production Code
  • Test Code
  • Between Production and Test Code
• Techniques
  • More Abstraction
    • Field Encapsulation
    • Type Generialization
    • Replace Conditional with Polymorphism
  • Breaking Code Apart
    • Extract Class
    • Extract Method
  • Improving Names and Location
    • Move Methods or Move Field
    • Rename Method or Rename Field
    • Pull Up, move to a superclass
    • Push Down, move to a subclass

Source: Wikipedia

Design Pattern

Here are most frequenly-used patterns as specified by Kerem Koseoglu in his book ABAP to the Future.

• Architectural Patterns
  • MVC, used all the time
• Creational Patterns
  • Factory and builder to create new objects in a centralized point
  • Singleton and multiton to prevent creation of multiple instances of the same objectrespectively
  • Lazy initialization for overall performance improvement
• Structural
  • Facade to make the life of other developers easier
  • Decorator to modify an object or dataset by multiple classes
• Behavioral
  • Template method to prevent algorithm duplication among similar classes
  • Strategy to make algorithms interchangeable
  • Observer to make objects communicate without making them interdependent
  • Visitor to extend the functionality of classes without modifying legacy code

Essential Knowledge