Answered Essay: I know a similair question that is answered is already in the archive. If possible can I get a clear d

I know a similair question that is answered is already in the archive. If possible can I get a clear details the answer? Thank in advance for your help.

Design and implement a stack in which each item on the stack is a varying number of integers. Choose a Java data structure to implement your stack and design push and pop methods for it. You may not use library functions.

Expert Answer


Please find my implememtation.

I have implemented using Linked List.

public class Stack


private int N; // size of the stack

private Node top; // top of the stack

// Node class that stores a element of the stack

static class Node{

int data;

Node next;

Node(int data) { = data;



// constructor

public Stack()


top = null;

N = 0;


boolean isEmpty()


return (top == null);



int size()


return N;


void push(int x)


// creating new node

Node newNode = new Node(x);

// if stack is empty

if (isEmpty())


top = newNode;



{ = top;

top = newNode; // new top


N++; // increasing size


int pop()


if (isEmpty())


System.out.println(“Stack Underflow”);

return -99;




int x =;

top =; // next element is the top now

N–; // decreasing the size

return x;




//Driver code

class Main


public static void main(String args[])


Stack s = new Stack();




System.out.println(s.pop() + ” Popped from stack”);




Sample run:

30 Popped from stack


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