Consider the following classes:D "ResearchArea java 3D"loumaljavapublic class Journal extends Publication {2 public enum ResearchArea {3 TECHNOLOGY, BUSINESS, HEALTH, PSYCHOLOGY4 }private int volume;private int issue;4D "Publicationjava 136public int getVolume () {return volume;17-2 public abstract class Publication {83public void setvolume (int volume) {this.volume = volume;}public int getIssue() {return issue;}10protected int year;protected String name;protected ResearchArea area;protected double price;51112131415public Publication(int year, String name, ResearchArea area) {this.year = year;this.name = name;this.area = area;9101112131415161718192021-222324 }1617-public void setIssue(int issue) {this.issue = issue;181920public double price() {public Publication() {this(2022, "Ahlia", ResearchArea. TECHNOLOGY);21return 50;22public void display (String name, int year) {System.out.printf("%s %d", super.name, super.year);232425public abstract double price();public void display (String name) {System.out.printf("%s", super.name);26public void message() {System.out.printin("This publication belongs to Ahlia University");272829 }302531Answer the following questions: (6* 5= 30 marks)1. Add the following method to Publication Class, explain what should be changed in the code?And Why?public abtract void Hello();2. Consider the test class below: What is the type of binding used in Line 6?12 public class Test {3public static void main(String[] args) {Journal j1= new Journal ();System.out.println(j1.price ( ));578}9.10 }

Answer the following questions: (6* 5= 30 marks) 1. Add the following method to Publication Class, explain what should be changed in the code? And Why? public abtract void Hella(); 2. Consider the test class below: What is the type of binding used in Line 6?

Answer the following questions: (6* 5= 30 marks) 1. Add the following method to Publication Class, explain what should be changed in the code? And Why? public abtract void Hella(); 2. Consider the test class below: What is the type of binding used in Line 6?

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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