Lecture6-Feb1-Interfaces

Lecture6-Feb1-Interfaces - 1 / 45 1 COP 3503 SPRING 2012...

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1 / 45 COP 3503 SPRING 2012 SHAYAN JAVED LECTURE 6 Programming Fundamentals using Java 1
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2 / 45 Interfaces
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6 / 45 Problem Need to add Pet behaviors to the pet animal classes (Cat and Dog): play()
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7 / 45 Option 1 Add concrete methods: play() to Animal class Animal Feline Canine Lion Cat Wolf Dog
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8 / 45 Option 1 Add concrete methods: play() to Animal class What’s the problem? Animal Feline Canine Lion Cat Wolf Dog
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9 / 45 Option 1 Add concrete methods: play() to Animal class What’s the problem? Also exist for Lion/Wolf Animal Feline Canine Lion Cat Wolf Dog
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10 / 45 Option 2 Add abstract methods: play() to Animal class Animal Feline Canine Lion Cat Wolf Dog
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11 / 45 Option 2 Add abstract methods: play() to Animal class Provide empty body for it in Lion and Wolf classes Animal Feline Canine Lion Cat Wolf Dog
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12 / 45 Option 2 Add abstract methods: play() to Animal class Provide empty body for it in Lion and Wolf classes Provide non-empty body for it in Cat and Dog classes Animal Feline Canine Lion Cat Wolf Dog
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13 / 45 Option 3 Add concrete methods: play() to Cat and Dog classes Animal Feline Canine Lion Cat Wolf Dog
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14 / 45 What we need Pet behaviors just in Pet classes (like Dog and Cat)
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15 / 45 What we need Pet behaviors just in Pet classes (like Dog and Cat) Consistency - Guarantee that all Pet classes use the same signature for Pet methods
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16 / 45 What we need Pet behaviors just in Pet classes (like Dog and Cat) Consistency - Guarantee that all Pet classes use the same signature for Pet methods Take advantage of Polymorphism
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Multiple Inheritance? Animal
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This note was uploaded on 02/15/2012 for the course COP 3503 taught by Professor Staff during the Spring '12 term at University of Florida.

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Lecture6-Feb1-Interfaces - 1 / 45 1 COP 3503 SPRING 2012...

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