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Answer:
The full code is added in the comments as per regulations. Continuation of driver.java code from the comments is available on the screenshot
Explanation:
Editable code:
//ListingNode.java
class ListingNode {
private listpro listing11;
private ListingNode nextnode;
public ListingNode(listpro listing11) {
this.listing11 = listing11;
}
public listpro getListing() {
return listing11;
}
public void setListing(listpro listing11) {
this.listing11 = listing11;
}
public ListingNode getnextnode() {
return nextnode;
}
public void setnextnode(ListingNode nextnode) {
this.nextnode = nextnode;
}
}
public class Listlinked {
private ListingNode headnode;
public Listlinked() {
headnode = null;
}
public void insert(listpro listing11) {
ListingNode listingNode = new ListingNode(listing11);
if(headnode == null) {
headnode = listingNode;
} else {
ListingNode tempval = headnode;
while (tempval.getnextnode() != null) {
tempval = tempval.getnextnode();
}
tempval.setnextnode(listingNode);
}
}
public listpro fetch(String name) {
ListingNode tempval = headnode;
while (tempval != null) {
if(tempval.getListing().getNamedata().equalsIgnoreCase(name)) {
return tempval.getListing();
}
tempval = tempval.getnextnode();
}
return null;
}
public boolean delete(String name) {
ListingNode tempval = headnode;
boolean found = false;
if(headnode != null) {
if(headnode.getListing().getNamedata().equalsIgnoreCase(name)) {
headnode = headnode.getnextnode();
found = true;
} else {
while (tempval.getnextnode() != null) {
if (tempval.getnextnode().getListing().getNamedata().equalsIgnoreCase(name)) {
found = true;
tempval.setnextnode(tempval.getnextnode().getnextnode());
break;
}
tempval = tempval.getnextnode();
}
}
}
return found;
}
public void printAll() {
ListingNode tempval = headnode;
while (tempval != null) {
System.out.println(tempval.getListing().toString());
tempval = tempval.getnextnode();
}
}
}
//listpro.java
import javax.swing.*;
public class listpro {
private String Name;
private int ID;
private float grade_point;
public listpro(){
}
public listpro(String Name, int ID, float grade_point){
this.Name = Name;
this.ID = ID;
this.grade_point = grade_point;
}
public String getNamedata() {
return Name;
}
public void setNamedata(String Name) {
this.Name = Name;
}
public int getID() {
return ID;
}
public void setID(int ID) {
this.ID = ID;
}
public float getgrade_point() {
return grade_point;
}
public void setgrade_point(float grade_point) {
this.grade_point = grade_point;
}
public listpro deepCopy(){
listpro clone = new listpro(Name,ID,grade_point);
return clone;
}
public String toString(){
return "Name : " + Name + "\nID :" + ID + "\nGrade points :" + grade_point;
}
public void input(){
Name = JOptionPane.showInputDialog("Enter a Name");
ID = Integer.parseInt(JOptionPane.showInputDialog("Enter an ID"));
grade_point = Float.parseFloat(JOptionPane.showInputDialog("Enter a grade point average"));
}
}
<h2>Explanation:</h2>
The source code, written in Java, and a sample output have been attached to this response. It contains comments explaining certain parts of the code.
A few things to note are;
(i) The Scanner class is imported to allow user's interact with the program. This is done by writing the import statement at the top of the code as follows;
<em>import java.util.Scanner;</em>
<em />
(ii) An object of the Scanner class is created to receive inputs from the user. The object is called input and created as follows;
<em>Scanner input = new Scanner(System.in);</em>
(iii) Since the user is expected to enter an integer, the nextInt() method of the Scanner object is used to receive the integer and this is saved in a variable called <em>number. </em>i.e
<em>int number = input.nextInt();</em>
<em></em>
(iv) A number x, is even if its remainder when divided by 2 is 0. i.e
if x % 2 = 0, then x is even. Otherwise it is odd.
The user's input received and saved in a variable called <em>number </em>is then checked using if and else blocks to check if it is even or not and can be written as follows;
<em>if(number % 2 == 0){</em>
<em> System.out.println(number + " is even");</em>
<em>}else {</em>
<em> System.out.println(number + " is odd");</em>
<em>}</em>