Jmkwasni at 03:59, 17 November 2009

2009-11-17T03:59:18Z

New page

==Widget Factory==

Widget Factory Extreme.

===The problem===

Within Java and other OO languages, alot of development is done within groups. Interfaces can help with task delegation to other developers, giving them a 'blueprint' for
a specific class. This paradigm fits directly into a waterfall development model, and as such is quite useful for programmers to learn. Interfaces also provide for easier code
re-factoring and application extensibility.

===Participants and props===

Ideally, there should be 3 participants. Below they are listed. For more than 3 people, you could add extra analyst with different sets business logic that the factory needed to implement.

Materials needed:

3-5 sheets of paper.
Computer *optional*.

{| border="1" cellspacing="0" cellpadding="5" align="center"
!
Class Developer (Creates Factory.java)
> Implements the method signatures per specification
!
Interface Developer (Creates IFactory.java)
> Determines what the factory needs to do
> Turns business logic into method signatures
!
Analyst (Determines what needs to be made)
> Determines the business logic
|}

===The script===

The instructor begins as the customer, describing a market for a product.

1) The group analyst takes note of what the customer wants, and designs a set of business rules around this.

Example : The customer wants hot air balloons - which vary in lift power, balloon circumference, material, capacity, and maximum altitude.

So the analyst documents all the variations of the product a customer would need built on 1-2 sheets of paper.

2) The group interface developer takes the documentation by the analyst and begins to create a class outline (the interface).

Example :
void setBalloonCircumference(double cir);

etc..

This should be written on another sheet of paper.

3) Once the interface is complete, the class developer must implement each method.

Example :
void setBalloonCircumference(double cir) {
this.circumference = cir;
}

etc..

Once again, this should be written on another sheet of paper

4) After the first 3 steps have been completed, if a computer is available, compile the code and run boundary/use cases. Then present the solution to the instructor for
feedback.

===Credits===
John Kwasnick and Josh Hill

CSC 216 F09/interfaces2 - Revision history

Jmkwasni at 03:59, 17 November 2009