chapter 9 inheritance - eecs.yorku.ca file1 1 york university – department of computer science...

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York University – Department of Computer Science

Chapter 9Inheritance

I. Scott MacKenzie

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Outline

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What is Inheritance?

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Terminology

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Inheritance UML Diagrams (1)

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Inheritance UML Diagrams (2)

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Inheritance UML Diagrams (3)

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Method Section of API

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Methods in a Child Class

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Child With Three Methods

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RewardCard API

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Inherited Fields

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Fields in a Child Class

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Child With Two Fields

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Fields in RewardCard Class

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Inheritance Chains

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Polymorphism

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instanceof Operator (1)

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instanceof Operator (2)

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instanceof Operator (3)

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Manual Casts

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Manual Cast Gotchas

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Reference Resolution and Binding

341-342

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Early and Late Binding

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Reference Resolution

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Abstract Classes

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Abstract Classes (2)

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Abstract Classes (3)

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Abstract Classes (4)

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Interfaces

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Interfaces (2)

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Disparate Hierarchies

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Object Class

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Object Class Methods

• Class getClass()• boolean equals(Object other)• String toString()• See API

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Thank You