Classes A class Is a unit of abstraction in an object oriented(Oo) rogram Represents similar objects -Its instances Is a kind of software module -Describes its instances'structure(properties) -Contains methods to implement their behaviour www.lloseng.com O Lethbridge/Laganiere 2001 Chapter 2: Review of object Orientation© Lethbridge/Laganière 2001 Chapter 2: Review of Object Orientation 7 Classes A class: • Is a unit of abstraction in an object oriented (OO) program • Represents similar objects —Its instances • Is a kind of software module —Describes its instances’ structure (properties) —Contains methods to implement their behaviour