JAVA HELP! Four integers are read from input and inserted into heightList. Complete the following tasks:

Assign heightIterator with heightList's ListIterator object.

Move heightIterator to the end of heightList.

Use heightIterator add value $-1$ as the last element of heightList.

Ex: If the input is $21273815,$ then the output is:

List contains: $21273815-1$

heightIterator is at the end of the list.

CODE:

import java.util.Scanner;

import java.util.LinkedList;

import java.util.ListIterator;

public class HeightsList $\{$

public static void main$($String$[]$ args$)\{$

Scanner scnr $=$ new Scanner$($System$.$in$)$;

LinkedList heightList $=$ new LinkedList$()$;

ListIterator heightIterator;

int i;

int nextIndex;

int previousIndex;

for $($i $=0$; i $<4$; $++$i$)\{$

heightList.add$($scnr$.$nextInt$())$;

$\}$

$/*$ Your code goes here $*/$

previousIndex $=$ heightIterator.previousIndex$()$;

nextIndex $=$ heightIterator.nextIndex$()$;

System.out.print$("$List contains:"$)$;

heightIterator $=$ heightList.listIterator$()$;

while $($heightIterator$.$hasNext$())\{$

System.out.print$(""+$ heightIterator.next$())$;

$\}$

System.out.println$()$;

if $($nextIndex $==$ heightList.size$())\{$

System.out.println$("$heightIterator is at the end of the list."$)$;

$\}$

else $\{$

System.out.println$("$heightIterator is between $"+$ heightList.get$($previousIndex$)+"$ and $"+$ heightList.get$($nextIndex$)+".")$;

$\}$

$\}$

$\}$