2) Obtain a String from user input, and output whether this string belongs to the language
L = {AnBn, n>=0}. Language L include all the strings of only As and Bs where: all letter Bs appear after letter As, and the number of letter As is the same as the number of letter Bs. Requirement: use stack operations (of link-based stack) to achieve above function.

3) Create and populate a stack that achieves the following two objectives:
a) The links-based implementation of the stack has the following items in sequence:
top -> 1 -> 2 -> 3 -> 4 -> 5
b) Implement a function that takes an ADTStack as a parameter and creates and returns a second stack that is the reverse of the parameter stack. For example, if the parameter stack‚Äôs initial state is what is above in part a), then the new stack is:   
top -> 5 -> 4 -> 3 -> 2 ->1

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import java.util.Scanner;

class Node{
    char value;
    Node next;

    public Node(char value){
       this.value = value;
       next = null;

    public char getValue(){
       return value;

    public Node getNext() {
       return next;

    public void setNext(Node next) { = next;

class StackLinkedList{

    private Node head;

    public StackLinkedList(){
       head = null;

    public void push(char value){
       Node node = new Node(value);
       if(head == null){
            head = node;
       }else {
            head = node;

    public char pop(){
            Node d = head;
            head = d.getNext();
            return d.getValue();
       }else {
            return ' ';

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