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Lecture 17

COP3502: Introduction to CIS I. Lecture 17. t omorrow: lab 3 pt. 2 n ew lab next week. e ach subclass redefines the abstract draw() method. i mplements its own version. p olymorphism (“many forms”) r eferring to each subclass as an instance of the superclass. p olymorphism (“many forms”)

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Lecture 17

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  1. COP3502: Introduction to CIS I Lecture 17

  2. tomorrow: lab 3 pt. 2 new lab next week

  3. each subclass redefines the abstract draw() method implements its own version

  4. polymorphism (“many forms”) referring to each subclass as an instance of the superclass

  5. polymorphism (“many forms”) referring to each subclass as an instance of the superclass many subclasses respond differently to the same message

  6. Shape circ = new Circle() Is this an instance of Shape or Circle?

  7. Shape circ = new Circle() Circle! can’t instantiate an abstract class

  8. Shape circ = new Circle() Circle! can’t instantiate an abstract class responds to “Shape” messages and ONLY “Shape” messages

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