Lecture 6 polymorphism

Introduction to Computer Science II COSC 1320/6305 Lecture 6: Polymorphism and Abstract Classes (Chapter 8)

Sales Records ,[object Object],[object Object],[object Object],[object Object],[object Object],7-

7- CLASS Participation A ! (pp. 479)

Let’s create two objects ,[object Object],[object Object],[object Object],8-

Introduction to Polymorphism ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],8-

Introduction to Polymorphism ,[object Object],[object Object],[object Object],8-

Late Binding ,[object Object],[object Object],[object Object],8-

The Sale Class ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],8-

The Sale Class ,[object Object],[object Object],[object Object],8-

The DiscountSale Class ,[object Object],[object Object],[object Object],8-

The Sale Class ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],8- It knows that it is a Discount object !

The Sale and DiscountSale Classes ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],8-

[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],The Sale and DiscountSale Class es 8-

The Sale and DiscountSale Classes ,[object Object],[object Object],[object Object],[object Object],[object Object],8-

Let’s create two more objects ,[object Object],[object Object],[object Object],8-

7- Copyright © 2010 Pearson Addison-Wesley. All rights reserved. Which object ’s method is this going to Execute? discount . lessThan ! ( lessThan is inherited from Sale !!! ) Which object ’s method is this going to Execute? specialPrice . equalDeals ! ( equalDeals is inherited from Sale !!! ) Step into equalDeals !

Pitfall: No Late Binding for Static Methods ,[object Object],[object Object],[object Object],[object Object],[object Object]

7- CLASS Participation B ! (pp. 488)

Let’s call static announcement() with class Name ,[object Object],[object Object],8-

Pitfall: No Late Binding for Static Methods ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],8-

Let’s create two objects ,[object Object],[object Object],8-

Let’s create one object ,[object Object],[object Object],[object Object],8-

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Pitfall: No Late Binding for Static Methods

Pitfall: No Late Binding for Static Methods ,[object Object],[object Object],[object Object],8-

The final Modifier ,[object Object],[object Object],[object Object],[object Object],8-

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Late Binding with toString 8-

Late Binding with toString ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],8-

Introduction to abstract Classes ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

CLASS Participation C ! (pp. 501)

Introduction to abstract Classes ,[object Object],[object Object],[object Object],[object Object],8-

Introduction to abstract Classes ,[object Object],[object Object],[object Object],[object Object]

Abstract Method ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],8-

Abstract Class ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],8-

Abstract Class ,[object Object],[object Object],[object Object],8- Step into the constructor !

Pitfall: You Cannot Create Instances of an Abstract Class ,[object Object],[object Object],[object Object],[object Object],8-

Tip: An Abstract Class Is a Type ,[object Object],[object Object],[object Object],8-

Upcasting and Downcasting ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],8-

Upcasting and Downcasting ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Pitfall: Downcasting ,[object Object],[object Object],[object Object],8-

Tip: Checking to See if Downcasting is Legitimate ,[object Object],[object Object],[object Object],[object Object],[object Object],8-

A First Look at the clone Method ,[object Object],[object Object],[object Object],[object Object],[object Object]

A First Look at the clone Method ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],8-

A First Look at the clone Method ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],8-

Pitfall: Sometime the clone Method Return Type is Object ,[object Object],[object Object],[object Object],[object Object],8-

Pitfall: Sometime the clone Method Return Type is Object ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],8-

Pitfall: Sometime the clone Method Return Type is Object ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],8-

Pitfall: Limitations of Copy Constructors ,[object Object],[object Object],[object Object],[object Object],8-

Lecture 6 polymorphism

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