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package com.algs;

import java.util.Iterator;

public class StackLinkedList<Item> implements Iterable<Item> {

private Node first;

private int N;

private class Node

{

Item item;

Node next;

}

public boolean isEmpty()

{

return N == 0;

}

public int size()

{

return N;

}

public void push(Item item)

{

Node oldfirst = first;

first = new Node();

first.item = item;

first.next = oldfirst;

N++;

}

public Item pop()

{

Item item = first.item;

first = first.next;

N--;

return item;

}

public Iterator<Item> iterator()

{

return new ReverseArrayIterator();

}

public class ReverseArrayIterator implements Iterator<Item>

{

private int i = N;

public boolean hasNext()

{

return i > 0;

}

@SuppressWarnings("unchecked")

public Item next(){

return (Item) first.next;

}

public void remove(){

}

}

}