QUESTION 16What must be true of a class with one abstract method?O The class must also implement the Iterable interfaceAny derived class must implement the methodThe abstract method must have the static modifierO The method cannot specify a return valueQUESTION 17Suppose we wanted to design a set of classes for a veterinarian's office. Our Customer class looks like this:public class Customer {Pet [] pets;}Select all the statements that are trueOnce the size of the pets array has been set, it cannot be changedBecause we're using an array, all pets must be the sameA customer must have at least one petWe also need to declare a Pet classQUESTION 18What is the proper use of an enumeration?To define a set of ordered valuesTo enforce the use of the Comparable interfaceO To define, or enumerate, the values returned by a Random object generatorO To define the classes in an inheritance hierarchy

16) The abstract method must have the static modifier 17) Because we're using an array, all pets…

UESTION 16 What must be true of a class with one abstract method? O The class must also implement the Iterable interface Any derived class must implement the method The abstract method must have the static modifier O The method cannot specify a return value

UESTION 16 What must be true of a class with one abstract method? O The class must also implement the Iterable interface Any derived class must implement the method The abstract method must have the static modifier O The method cannot specify a return value

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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Concept explainers

OOPs

In today's technology-driven world, computer programming skills are in high demand. The object-oriented programming (OOP) approach is very much useful while designing and maintaining software programs. Object-oriented programming (OOP) is a basic programming paradigm that almost every developer has used at some stage in their career.

Constructor

The easiest way to think of a constructor in object-oriented programming (OOP) languages is:

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