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import java.util.Iterator;


class CallStackIterator<T> implements Iterator<T>
{
Object[] arr;
int pos = 0;

public CallStackIterator(CallStack<T> cs)
{
arr = cs.toArray();
}

@Override
public boolean hasNext() {
return pos < arr.length;
}

@SuppressWarnings("unchecked")
@Override
public T next() {
// TODO Auto-generated method stub
if (!hasNext())
throw new NullPointerException();

return (T)arr[pos++];
}
}

class CallStack<T> implements Iterable<T> {
// You'll want some instance variables here

Node<T> data = null;
int nItems = 0;

public CallStack() {


//setup what you need
}

public void push(T item) {
//push an item onto the stack
//you may assume the item is not null
//O(1)

if (data == null)
data = new Node<T>(item);
else
{
Node<T> newNode = new Node<T>(item);
newNode.setNext(data);
data.setPrev(newNode);
data = newNode;
}

nItems++;
}

public T pop...
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