Object Modeling

 What is object-oriented analysis, and what are some advantages of using this technique?

 What is object-oriented analysis, and what are some advantages of using this technique?

Analysis will integrate easily with object oriented programming languages (Java, Smalltalk, C++, Perl) Code is modular and reusable. This can reduce cost and development time. It is easy to maintain and expand as new objects can be cloned using inherited properties.

 Define an object, and give an example.

 Define an object, and give an example.

Object a real person, place, event, or transaction Data and process that act on the data can be combined into Objects

Example

A few Objects in medicine include Physician, Patient, and An Appointment.

A homework assignment is an object.

 Define an attribute and give an example.

 Define an attribute and give an example.

Attribute: A single characteristic or fact about an entity – the smallest piece of data that has meaning within an information system – a field. Example: The object of a car has attributes of make, model and color.

 Define a method and give an example.

 Define a method and give an example.

Method: A method defines specific tasks that an object (can/must) perform. A method describes what and how an object does something.

Examples : perate window wipers, apply vehicle brakes.

 Define a class and give an example.

 Define a class and give an example.

Class: A collection of similar objects Example: Objects of homework assignment to review a chapter 2, to provide a case example on chapter 2, and to review material for an exam could have a collection of similar objects into one Class known as Assignments.

 Define a subclass and give an example.

 Define a subclass and give an example.

Subclass: further division of objects in a class – into more specific categories within a class Example: A generalized class of Assignments could have a specialized Subclass to only include assignments focused on Case Examples reflected within a chapter, or a different subclass to only include assignments that reviewed important vocabulary within a chapter.

 Define encapsulation and explain the benefits it provides.

 Define encapsulation and explain the benefits it provides.

Encapsulation: All data and methods are self contained, as in a black box.

Example: A gas pump operation with a choice of multiple selections of fuel, without responsibility to figure out how to get the chosen fuel to reach a single nozzle.

 Define polymorphism, and give an example

 Define polymorphism, and give an example Polymorphism: The concept that a message gives different messages to two (or more) different objects

Example:

results depending if it is received by a child or the family dog.

Good Night message might produce different

 Define an actor and give an example

 Define an actor and give an example Actor: An external entity with a specific role. In a use case model, actors are used to model interaction with the system.

An Actor initiates activity by requesting the system to perform a function or process In a use case diagram, the user becomes the Actor, with a specific role that describes how interaction occurs with the system Example: A sales System has a credit card validation “Use Case” with the customer as an Actor

 Apply the phrase “use case”

 Apply the phrase “use case” Use-Case: A description in UML Unified Modeling Language that documents the name of the use case, the actor, a description of the use case, a step-by-step list of the tasks required for successful completion, and other key descriptions and assumptions