Answered: Question part 3: Draw a UML class…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question part 3: Draw a UML class diagram with all the classes and relationships.

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In this last and final part of the course work you are required to change the definition of the Item_in_Stock class to make it an abstract class and change the getItemCat(), getItemName() and getItemDescription() definitions to make them abstract methods.

You are then required to design and implement three classes which are derived from Item_in_Stock class to fully demonstrate the concept of inheritance and polymorphism. Implementation of HP_Laptop class in part II should have given you an idea of inheritance and polymorphism.

Three sub classes, one class against each category (Computers, Laptops and Accessories), should contain appropriate constructors, instance variables, setter and getters methods and overridden methods for getItemName(), getItemDescription() and get_Item_details() method.

You should be creative and come up with your own ideas of sub-classes.

(please see the photo if you need for the diagram for the previous part)

Transcribed Image Text:-item_code: String - item-name: String 1 Item-im-Stock item-Description : string -quantity-in-stock: it - item - price : double - + item-'m-Stock (string, int double) + getItem Code (): String + getItem Name(); string + getItem Description(); String + get Quantity InStock(): int +getItem Cat () :string + add-Item () + item-sell() + tax_on_item(): double + setItem price () + getItemprice Without Tax(): double +getItemprice with Tax(): clouble +getItem-Details ( ) itemStock -itemCode: String -itemName: String -item Description -itemQty: int -item Category: String +getItemQty():int +setItemName():void HPLaptop -brand:string -type:string +setBrand() +getType()

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