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/**

*

* @author Varun Upadhyay (https://github.com/varunu28)

*

*/

// An implementation of a Stack using a Linked List

class StackOfLinkedList {

public static void main(String[] args) {

LinkedListStack stack = new LinkedListStack();

stack.push(1);

stack.push(2);

stack.push(3);

stack.push(4);

stack.push(5);

stack.printStack();

System.out.println("Size of stack currently is: " + stack.getSize());

stack.pop();

stack.pop();

System.out.println("Top element of stack currently is: " + stack.peek());

}

}

// A node class

class Node {

public int data;

public Node next;

public Node(int data) {

this.data = data;

this.next = null;

}

}

/**

* A class which implements a stack using a linked list

*

* Contains all the stack methods : push, pop, printStack, isEmpty

**/

class LinkedListStack {

Node head = null;

int size = 0;

public void push(int x) {

Node n = new Node(x);

if (getSize() == 0) {

head = n;

}

else {

Node temp = head;

n.next = temp;

head = n;

}

size++;

}

public void pop() {

if (getSize() == 0) {

System.out.println("Empty stack. Nothing to pop");

}

Node temp = head;

head = head.next;

size--;

System.out.println("Popped element is: " + temp.data);

}

public int peek() {

if (getSize() == 0) {

return -1;

}

return head.data;

}

public void printStack() {

Node temp = head;

System.out.println("Stack is printed as below: ");

while (temp != null) {

System.out.println(temp.data + " ");

temp = temp.next;

}

System.out.println();

}

public boolean isEmpty() {

return getSize() == 0;

}

public int getSize() {

return size;

}

}