Finding Classes Copyright © 1999 Patrick McDermott College of Alameda A Quest: David, Earl of Huntingdon, 1120 from A Critical Inquiry into Antient Armour (1842)

A Class Tracks… An Entity : A Thing the Business needs to know about. At this stage, a business person should be able to understand every one of them. “Entity” is best defined by examples…

People George Romney ( ) Emma, Lady Hamilton ( ) 1786 Albrecht Dürer ( ) Self-Portrait 1498

Places

Things Gustave Caillebotte (1848–94) Le pont de l’Europe 1877 Katsushika Hokusai 葛飾北斎 ( ) Fuji from beneath Mannen Bridge in Fukagawa Fukagawa mannenbashi shita 深川万年橋下 36 Views of Mount Fuji 富嶽三十六景 Fugaku Sanjūrokkei ca

Events Meeting of the Rails Promontory Point, Utah, 1869 Andrew J. Russell

Organizations Dorothea Lange ( ) Richmond shipyards, 1943 Dorothea Lange ( ) End of shift 3:30, Richmond, California September 1943

Examples of Classes Tangible People –Employees –Students Places –Shipping Locations –Offices Things –Equipment –Vehicles Intangible Accounts Cost Centers Departments Grades

You need a Class if… There’s a form There’s a number There’s a file There are several copies It’s Important NOTE— –Sections and boxes on Forms –The name might not be obvious They’re Everywhere!

Classes have Responsibilities Personification Helps –What if a person, not a computer, does it? –Obligation or Contract Know Things –Invoice: Know who the Customer is Do Things –Invoice: Compute Total