CSE 2341 Object Oriented Programming with C Note Set

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CSE 2341Object Oriented Programming with
CNote Set 11
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Quick Look

• More on Relationships
• Introduction to Inheritance

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Review

• 3 types of relationships
• is a
• has a
• uses a

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has - a

• Aggregation/Composition
• one object contains another object

car has a motor human has a brain MorseEncoder
has a MorseMap
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aggregation
class car public//stuff private Motor
myMotor
class human public//stuff private
Brain myBrain
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is a

• is a - relationship that represents
  inheritance/generalization (class derivation)
• For example
• Helicopter is a vehicle
• Train is a vehicle
• Truck is a vehicle
• Plane is a vehicle
• Motorcycle is a vehicle

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Inheritance Diagram
Vehicle
CAR
HELICOPTER
TRAIN
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Uses A Relationship

• An operation of class A receives or returns an
  object of class B
• In the process of an operation of class A, an
  object of class B must be inspected or created
• Objects of class A contain a reference to objects
  of class B

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Identify Relationships

• Sun, Planet __________
• Elevator, Rider __________
• Date, Person __________
• Person, Employee __________
• Circle, Point __________
• Manager, Employee __________
• Triangle, Rectangle __________
• Computer, Keyboard __________
• Computer, Person __________
• Computer, Laptop __________

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Two Types of Inheritance
Multiple
Single
BASE2
BASE3
BASE1
DerivedA
DerivedC
DerivedD
DerivedB
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Draw an Inheritance Diagram

• Person
• Student
• Name
• Address
• Professor

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Fini
?