enum ResearchArea { LOGY, BUSINESS, HEALTH, PSYCHOLOGY public class Journal extends Publication { private int volume; private int issue; public int getvolume() { 7- abstract class Publication { return volume; public void setvolume(int volume) { this.volume - volume; 10 otected int year; otected String name; otected ResearchArea area; otected double price; 11 12 public int getissue() { return issue; blic Publication(int year, String name, ResearchArea area) { this.year - year; this.name- name; this.area = area; 13 14 15 16 17- public void setIssue(int issue) { this.issue - issue; 18 19 -20 public double price() { return 5e; blic Publication() { this(2022, "Ahlia", Researcharea. TECHNOLOGY); 21 22 23 24 public void display(String name, int year) System.out.printf("%s %d", super.name, blic abstract double price(); 25 26 public void display(String name) { System.out.printf("%s", super.name); blic void message() { System.out.printini"This publication belongs to Ahlia University"); 27 28 29 } зе 31 Answer the following questions: 1. In class Publication: Line 9 to 17: explain the OOP concept? And why is it used? 2. In class Journal: Line 20 to 22: Which OOP concept is used here? And why? 3. Explain how can all objects share the same copy of a certain variable? 4. Add the following method to Publication Class, explain what should be changed in the code And Why?
enum ResearchArea { LOGY, BUSINESS, HEALTH, PSYCHOLOGY public class Journal extends Publication { private int volume; private int issue; public int getvolume() { 7- abstract class Publication { return volume; public void setvolume(int volume) { this.volume - volume; 10 otected int year; otected String name; otected ResearchArea area; otected double price; 11 12 public int getissue() { return issue; blic Publication(int year, String name, ResearchArea area) { this.year - year; this.name- name; this.area = area; 13 14 15 16 17- public void setIssue(int issue) { this.issue - issue; 18 19 -20 public double price() { return 5e; blic Publication() { this(2022, "Ahlia", Researcharea. TECHNOLOGY); 21 22 23 24 public void display(String name, int year) System.out.printf("%s %d", super.name, blic abstract double price(); 25 26 public void display(String name) { System.out.printf("%s", super.name); blic void message() { System.out.printini"This publication belongs to Ahlia University"); 27 28 29 } зе 31 Answer the following questions: 1. In class Publication: Line 9 to 17: explain the OOP concept? And why is it used? 2. In class Journal: Line 20 to 22: Which OOP concept is used here? And why? 3. Explain how can all objects share the same copy of a certain variable? 4. Add the following method to Publication Class, explain what should be changed in the code And Why?
Chapter11: Advanced Inheritance Concepts
Section: Chapter Questions
Problem 2GZ
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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:
Question
urgent plzzz.
Transcribed Image Text:Question1:
Consider the following classes:
D "ResearchAreajava 3
D"lounal.java 13
1
1
2 public enum ResearchArea {
3 TECHNOLOGY, BUSINESS, HEAL TH, PSYCHOLOGY
4 }
public class Journal extends Publication {
private int volume;
private int issue;
4
D
D "Publication java 18
public int getVolume () {
return volume;
7-
2 public abstract class Publication {
8
9
10
11
3
public void setvolume (int volume) {
this.volume = volume;
4
protected int year;
protected String name;
protected ResearchArea area;
protected double price;
5
6.
12
13
14
15
public int getIssue() {
return issue;
}
7
public Publication(int year, String name, ResearchArea area) {
this.year = year;
this.name = name;
this.area = area;
9
16
17-
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24 }
public void setIssue(int issue) {
this.issue = issue;
18
19
20
21
public double price() {
return 50;
public Publication() {
this(2022, "Ahlia", ResearchArea. TECHNOLOGY);
22
public void display(String name, int year) {
System.out.printf("%s %d", super.name, super.year);
23-
24
public abstract double price();
25
public void display(String name) {
System.out.printf("%s", super.name);
}
26
public void message() {
System.out.printin("This publication belongs to Ahlia University");
27
28
29 }
30
25
31
Answer the following questions:
1. In class Publication: Line 9 to 17: explain the OOP concept? And why is it used?
2. In class Journal: Line 20 to 22: Which OOP concept is used here? And why?
3. Explain how can all objects share the same copy of a certain variable?
4. Add the following method to Publication Class, explain what should be changed in the code?
And Why?
public abtract void Hello();
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