CS51 - Fall 2009 - Lecture 7

  • book problems: casting, == and .equals

  • examples of defining and using classes
  • ClassyBasketball
  • Class contains: 
             public class NameOfClass {
              // constants

              // instance variables

              // constructor(s)

              // method(s)
         }
  • thinking at 2 levels: what would someone using the class want to do with it? how do you implement that functionality?

  • instance variables
  • keeps track of the state of an object
  • can be used in multiple methods

  • constructors
  • what does a new object "look" like?
  • at a minimum should initialize the instance variables.
  • parameters as a way of passing information
  • formal parameters in constructor/method declarations
  • actual parameters are passed in when that constructor/method is invoked.

  • methods
  • what can objects of this class do?

  • TShirt class, used in two ways.
  • DragAShirt
  • Drag2Shirts

  • use of keyword this

  • Lab 3:
  • Description: <html> <pdf>