Identify the following statements as valid or invalid. i) e = spa; ii) spa = food; 111) spa new Food(): iv) %3D %3D food (Spaghetti) e: v) %3D e = new Spaghetti():

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 7
(a) Suppose the class Spaghetti implements the Edible interface and the base class of
Spaghetti is Food class. You have given the following variables declaration:
Food food;
new Spaghetti ();
Spaghetti spa
Edible e = null;
%3D
Identify the following statements as valid or invalid.
i)
e spa;
spa = food;
= new Food():
ii)
spa
food (Spaghetti) e:
e = new Spaghetti():
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Transcribed Image Text:Question 7 (a) Suppose the class Spaghetti implements the Edible interface and the base class of Spaghetti is Food class. You have given the following variables declaration: Food food; new Spaghetti (); Spaghetti spa Edible e = null; %3D Identify the following statements as valid or invalid. i) e spa; spa = food; = new Food(): ii) spa food (Spaghetti) e: e = new Spaghetti(): CS Scanned with CamScanner
(b) Given the following class:
class Pet (
String name;
Pet (String n) (
name
= n;
//getter & setter method
Create a class called Owner with the following details:
An owner name as a string type.
An object of Pet type.
A constructor to accept the owner's name and pet's name.
A getter method for the pet object.
Override the toString method to print out both names.
Override the equals method to check the equality of the owner's name
and pet's name. Pass a parameter as Owner type in this method.
(c)
Based on the Owner and Pet classes. Write a fragment of code to instantiate an Owner
object with any names. Then, change the pet name to 'Blacky'.
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Transcribed Image Text:(b) Given the following class: class Pet ( String name; Pet (String n) ( name = n; //getter & setter method Create a class called Owner with the following details: An owner name as a string type. An object of Pet type. A constructor to accept the owner's name and pet's name. A getter method for the pet object. Override the toString method to print out both names. Override the equals method to check the equality of the owner's name and pet's name. Pass a parameter as Owner type in this method. (c) Based on the Owner and Pet classes. Write a fragment of code to instantiate an Owner object with any names. Then, change the pet name to 'Blacky'. CS Scanned with CamScanner
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