LAB-1027, 1.2 Build MyOnlineShopUsingAbstractClass program, abstract mehtod defined in the Product is not implemented in extended class Electoronics

[Joseph John]

Hi
In the lab notes,  1.2 Build MyOnlineShopUsingAbstractClass program
The Electronics class which is a abstract class extended from Product class has to implement all the abstract method of Parent Product, But in the notes abstract method  computeSalePrice() is not implemented in Electronics.java class

Attached is the screen shot of the notes
thanks
Joseph John

[Martin]

I do not think so. 

Lets look at it.

abstract class Product --> abstract class Electronic --> class MP3Player ... implements computeSalePrice()

So you are implementing public double computeSalePrice() in MP3Player class. That's absolutely correct.

Abstract class which has super (parent) class do not have to implement any of parent class methods because it is still abstract class. Abstract class is not here to implement anything. Class derived from abstract class has to implement functions. 

I recommend you to go again over "Inheritence" lesson to understand this better.

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Martin

Dne čtvrtek, 20. února 2014 7:21:22 UTC+1 Joseph John napsal(a):

[Joseph John]

Thanks martin

Thanks for the explanation

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