// Name : Matthew Reeves 
// Allows for the creation of a stack

package ListPkg;

import ExceptionPkg.EmptyListException;

//extends the linked list method to create a stack

public class Stack extends LinkedList
{
	public Stack()
	{
		super ("Stack");
	}

	public Stack(String listName)
	{
		super (listName);
	}

	//adds an object to the stack

	public void push(Object object)
	{
		insertAtFront(object);
	}

	//removes top element of stack

	public Object pop() throws EmptyListException
	{
		Object topValue=top();	
		
		if (isEmpty())
		{
			throw new EmptyListException();
		}

		else
		{
			
			removeFromFront();
		}

		return topValue;
	}

	//allows top element on stack to be returned and printed to screen

	public Object top() throws EmptyListException
	{
		if (isEmpty())
		{
			throw new EmptyListException();
		}
		
		Object topValue=removeFromFront();

		insertAtFront(topValue);

		return topValue;
	}
}