Object Oriented Analysis¶

Definitions¶

Encapsulation: complete integration of data and processes working on these data into one unit.
Inheritance: the ability of a class to inherit the properties of another class.
abstract data type ADT: just means an object.
meta class: a class that describes the structure of other classes. also called generic class or gen class.
generalization class: defines a group of similar objects eg. Vehicle is a generalization class for Car, Bus, Truck, etc.
specialization class: a class that inherits the properties of another class. eg. Car is a specialization class of Vehicle.
Messages between objects: client object sends (requests) a message from the supplier object. message has 3 prats:
- Addressee: the object that receives the message.
- Service Name: the name of the method to be invoked
- arguments: the parameters of the method to be invoked.
polymorphism: the same process to take different forms in different situations or objects.
summary of object analysis and design documentation:

a single paragraph summarizing the problem at a high level.
done by SE + user
rules:
- All major functions, data entities,information sources, and destinations are identified.
- All sentences are at the same level of abstraction,detail, and importance.

starts from every noun in the summary paragraph, then eliminate the nouns that are attributes of other nouns. eg. customer address.
define if the noun (object) belongs to the problem space or the solution space, then give each object a unique name.
Class/object diagram format

starts from every verb in the summary paragraph, then eliminate the verbs that are not actions of the objects. eg. status, comments, physical actions.
define if the verb (process) belongs to the problem space or the solution space, then give each process a unique name.
assign each process to an object, and define the input and output of the process.