1. Mastering OOP Concepts
*see OOP fundamentals PowerPoint
What is a class
What is an object
What is instanstiation? (creating an instance of a class)
Object orientaed concepts and terminology

2. The context of UML One of the first ever object orientated languages
Was originally used for producing simulations
It provided the framework for many of the object oriented languages today.
What is Simula?

3. Features of OO Languages
Abstraction
Polymorphism
Encapsulation
Inheritance
Message Passing/Dynamic Binding

4. Features of OO Languages
Abstraction
“Hiding the complexity of the program,
Presenting only the essential features”

5. UML
Features of
A way of visually showing the architecture of the whole system v a
A way of showing the same system from different points of view
P O V
A standard graphical set of shapes representing objects in the system g o
A standard way of documenting the attributes (data) of each object s a
A way of defining functions/methods that can change the state of objects
F or M
A way of showing how the objects interact with each other i
A way of showing how to generate code directly from a UML diagram c

6. Two types
of UML diagrams
tructure S
ehaviour B

7. Things you need to look out for:
From OCR A Level Computing
June 2010 F453
Key Diagrams identify … look for
Class Diagram
Inheritance
Class/object
Object Diagram
Polymorphism
Attributes/properties
From OCR Past Paper A Level Computing
State Diagram
Encapsulation
Methods/Operations
Look for the “state” Current/Processing
Abstraction
Superclass
Sequence Diagram
Look for the dots (from top to bottom)

8. What type of Diagram is this?
Class Diagram
What feature of OO does
The arrow signify?
Inheritance ? ?

9. What type of Diagram is this?
Object Diagram

10. What type of Diagram is this?
Sequence Diagram
Examples of “Messages”

11. Past Paper Questions From OCR A Level Computing June 2011 Past paper
From OCR Past Paper A Level Computing

12. From June 2011 F453 OCR computing past paper
*example

13. From June 2011 F453 OCR computing past paper

14. From June 2011 F453 OCR computing past paper

15. Answers L S i

16. From June 2011 F453 OCR computing past paper

17. Answers s p
From June 2011 F453 OCR computing past paper

20. Answer

21. From June 2011 F453 OCR computing past paper

22. Answer

23. From June 2011 F453 OCR computing past paper

24. Answers
From June 2011 F453 OCR computing past paper

25. Past Paper Questions From OCR A Level Computing June 2011 Past paper
From OCR Past Paper A Level Computing

28. Answers

30. Answers

33. Answers

36. Answers

37. What do you remember about: Sequence Diagrams?
From Jan 2013 F453 Past Paper
What do you remember about: Sequence Diagrams?

39. State Diagram

40. (6 marks)

41. Mark scheme Answer