I need help writing the code for lastIndexOf and removeAll

I provided the previous code to understand the program. // written in Java

1 package lab08; 2 4 // modified version of Chapter 16 LinkedIntList class (page 990) 5 public class LinkedIntList t public ListNode front; // first value in the list // post:constructs an empty list public LinkedIntList(){ 9e 10 front-null; 12 13 public LinkedIntList(int[] arr) 14 15 16 17 18 19 20 this(); for (int = 0; 1arr.length; 1++) add (arr[i]); // post: returns the current number of elements in the lists public int size)t int count = 0; ListNode current- front; while (current != null){ 23 24 25 26 27 28 29 30 31 current = current.next; count++; return count; /7/, post: return comma-separated, bracketed version of the tist public String toString()