Write a main function in Java where it utilizes the insertAfter function.

class Node{

int key;

Node next;

public Node(int data) {

key = data;

next = null;

}

}

class LinkedList{

Node head;

public LinkedList() {

head = null;

}

public boolean isEmpty() {

return head == null;

}

public void insertAtFront(int new_data) {

// create a new node of object type Node

Node new_node = new Node(new_data);

// the next of this node will by the current head node

new_node.next = head;

// the new head will be the new node with the new data

head = new_node;

}

public void insertAtEnd(int new_data) {

Node new_node = new Node(new_data);

// if head is null, make this new node the head and next is null

if(head == null) {

head = new_node;

return;

}

new_node.next = null;

Node last = head;

while(last.next != null) {

last = last.next;

}

last.next = new_node;

return;

}

public void show() {

Node node = head;

while(node.next != null) {

System.out.println(node.key);

node = node.next;

}

System.out.println(node.key);

}

public void insertAfter(Node prev_node, int new_data) {

if(prev_node == null) {

System.out.println("The given previous node cannot be null!");

return;

}

Node new_node = new Node(new_data);

new_node.next = prev_node.next;

prev_node.next = new_node;

}

}