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) {

this.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;

}

else

{

newNode.next = top;

top = newNode; // new top

}

N++; // increasing size

}

int pop()

{

if (isEmpty())

{

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

return -99;

}

else

{

int x = top.data;

top = top.next; // 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();

s.push(10);

s.push(20);

s.push(30);

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

}

}

/*

Sample run:

30 Popped from stack

*/

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