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Chapter 8 Polymorphism

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OUM SAOKOSAL
OUM SAOKOSAL

Chapter 8 Polymorphism Taught by Oum Saokosal, Head of Information Technology, National Polytechnic Institute of Cambodia

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Chapter 8 Inheritance and Polymorphism Oum Saokosal , Head of IT Department National Polytechnic Institute of Cambodia Tel: (855)-12-417214 E-mail: oum_saokosal@yahoo.com
Chapter 8 Polymorphism
Polymorphism ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
What is Polymorphism? (1) ,[object Object],[object Object],[object Object],[object Object],[object Object]
What is Polymorphism? Example (2) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Student +getClassName():String UndergraduateStudent +getClassName():String GraduateStudent +getClassName():String
What is Polymorphism? Example (3) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
What is Polymorphism? Test 1 (4) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],That’s polymorphism
What is Polymorphism? Test 2 (5) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
What is Polymorphism? Test 2 (6) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],Why Polymorphism? (1) Parent/Superclass Children/Subclass Student getClassName():String UndergraduateStudent getClassName():String GraduateStudent getClassName():String
Specific Uses of Polymorphism Methods (1) ,[object Object],[object Object],[object Object]
Specific Uses of Polymorphism Array (2) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Specific Uses of Polymorphism Array (3) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Specific usages of Polymorphism Array (4) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Note #1 (1) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],GraduateStudent and UndergraduateStudent override getClassName() method!
Note #1 (2) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Note #2 (1) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Note #2 (2) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Note #3 (1) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Note #3 (2) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
The bottom line (1) ,[object Object],[object Object],[object Object],[object Object],[object Object],Student getClassName():String UndergraduateStudent getClassName():String GraduateStudent getClassName():String
The bottom line (2) ,[object Object],[object Object],[object Object]
Remember (1) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Remember (2) ,[object Object]
Casting Objects (1) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Casting Objects (2) ,[object Object],CB is a curious student who always asks questions whereas SR is a smart student. She can help to answer CB’s questions. SR : Smart Rabbit CB: Curious Ball
Casting Objects (3) ,[object Object],[object Object],[object Object]
Casting Objects (4) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Casting Objects (5) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Casting Objects (6) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Casting Objects (6) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Casting Objects (7) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Casting Objects (8) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Casting Objects (9) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Casting Objects (10) ,[object Object],[object Object],[object Object],[object Object]
Casting Objects (11)
Casting Objects (11) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
instanceof Operation (1) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
instanceof Operation (2) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
instanceof Operation (3) CB: OK. It seems to me that I know them all, but I want to ask you, Smart Rabbit, whether the 3rd year students in NPIC who are watching us understand it or not. SR: This is a hard question. I’m not sure either. You’ve better ask them by yourself.
Remember (1) ,[object Object],[object Object],[object Object],[object Object],[object Object]
Remember (2) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

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Chapter 8 Polymorphism

  • 1. Chapter 8 Inheritance and Polymorphism Oum Saokosal , Head of IT Department National Polytechnic Institute of Cambodia Tel: (855)-12-417214 E-mail: oum_saokosal@yahoo.com
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  • 40. instanceof Operation (3) CB: OK. It seems to me that I know them all, but I want to ask you, Smart Rabbit, whether the 3rd year students in NPIC who are watching us understand it or not. SR: This is a hard question. I’m not sure either. You’ve better ask them by yourself.
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