In this assignment, you are required to implement a HeadTailList class to manage a

linked list of double values. You need to use the following template.

public class HeadTailList$\{$

private class Node $\{$

double item;

$\}$

Node next;

private Node head;

private Node tail;

private int size;

public HeadTailList$()\{$

head $=$ null;

tail $=$ null;

$\}$

size $=0$;

public HeadTailList$($double value$)$

$\{$

$//$ Constructor implementation needed

$\}$

public boolean isEmpty$()\{$

$\}$

return size $==0$;

public int length$()\{$

$\}$

return size;

$\}$

$//$ Additional methods to be implemented...

a$)(10$ points$)$ Implement the HeadTailList $($double value$)$ constructor.

b$)(10$ points$)$ Implement a method insertFront $($double value$)$ to add a new element at

the front of the list.

c$)(10$ points$)$ Implement a method insertEnd $($double value$)$ to add a new element at the

end of the list.

d$)(20$ points$)$ Implement a method insertAtPosition$($double value, int position$)$ to

insert a new element at a specified position in the list.

e$)(10$ points$)$ Implement a method removeEnd $()$ to delete the last element of the list.

f$)(10$ points$)$ Implement a method printList $()$ to display all items in the list.