addAtFront$($Node$,$ int$)$ : Node When called and passed a reference to the head Node of a linked list and an int value to add to the list, this method will create a new Node object to store the int value, and will then make this Node the new head Node for this linked list. This method must return a reference to the new head Node.

printList$($Node$)$ When called and passed a reference to the head Node of a linked list, this method will print out a comma separated list of the int values in the linked list. This method will not return anything.

The printed output must be formatted like the following examples:

$\{\}$

$\{55\}$

$\{11,22,33\}$

getSize$($Node$)$ : int When called and passed a reference to the head Node of a linked list, this method must compute and return the number of nodes in the list.

addToEnd$($Node$,$ int$)$ : Node When called and passed a reference to the head Node of a linked list and an int value to add to the list, this method will create a new Node object to store the int value, and then will make this Node the new last Node in this linked list.

This method must return a reference to the head Node of the list.

removeFromFront$($Node$)$ : Node When called passed a reference to the head Node of the linked list, this method will remove the current head node of the list and return a reference to the new head Node.

removeFromEnd$($Node$)$ : Node When called and passed a reference to the head Node of a linked list, this method will remove the last Node of the list and return a reference to the head Node.

insertAtIndex$($Node$,$ int, int$)$ : Node The first argument will be the head of a linked list.

The second argument will be the zero$-$based index where the new value should be inserted.

The third argument will be the new value to be inserted into the list.

When called and passed a reference to the head Node of a linked list, an index, and a new int value, this method must make a new Node to store the new int value, and insert the node at the correct index in the list.

This method must return a reference to the head Node of the list.

removeAtIndex$($Node$,$ int$)$ : Node The first argument will be the head of a linked list.

The second argument will be the zero$-$based index of the Node that should be removed.

When called and passed a reference to the head Node of a linked list, and an index, this method must remove the specified Node from the list.

This method must return a reference to the head Node of the list.