///*******************************************************************
//*
//*   Projeto: POO em Java
//*
//*   Modulo: PilhaInterf.java
//*
//*   Objetivo: Define interface para TAD Pilha.
//*
//*   Classes & Funcoes Exportadas: PilhaInterf
//*
//*   Versao Original: 1.0          Data: agosto 2001
//*
//*   Autor: Ismael H F Santos
//*
//*   Email: ismael@tecgraf.puc-rio.br
//*
//********************************************************************
//*
//*   Historico de Alteracoes:
//*
//*   DATA        AUTOR                  COMENTARIO
//*   ----        -----                  ----------
//*   xx/yy/00    ....                   ....
//*
//*******************************************************************/
public interface PilhaInterf {
  boolean isEmpty();                
  boolean isFull();                
  void push(Object o);              
  Object pop();                     
  Object top();                  
}