<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >Palavra-Chave 'final'</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK REL="HOME" TITLE="Manual do PHP" HREF="index.html"><LINK REL="UP" TITLE="Classes e Objetos (PHP 5)" HREF="language.oop5.html"><LINK REL="PREVIOUS" TITLE="Métodos Mágicos" HREF="language.oop5.magic.html"><LINK REL="NEXT" TITLE="Clonando objetos" HREF="language.oop5.cloning.html"><META HTTP-EQUIV="Content-type" CONTENT="text/html; charset=UTF-8"></HEAD ><BODY CLASS="sect1" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#840084" ALINK="#0000FF" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="3" ALIGN="center" >Manual do PHP</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="language.oop5.magic.html" ACCESSKEY="P" >Anterior</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" >Capítulo 19. Classes e Objetos (PHP 5)</TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="language.oop5.cloning.html" ACCESSKEY="N" >Próxima</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><DIV CLASS="sect1" ><H1 CLASS="sect1" ><A NAME="language.oop5.final" >Palavra-Chave 'final'</A ></H1 ><P > PHP 5 introduz a palavra-chave 'final', que previne que classes filhas sobrecarreguem um método ou variável. Basta prefixar a definição com 'final'. </P ><TABLE WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" CLASS="EXAMPLE" ><TR ><TD ><DIV CLASS="example" ><A NAME="AEN5949" ></A ><P ><B >Exemplo 19-29. Exemplo de métodos 'final'</B ></P ><TABLE BORDER="0" BGCOLOR="#E0E0E0" CELLPADDING="5" ><TR ><TD ><code><font color="#000000"> <font color="#0000BB"><?php<br /></font><font color="#007700">class </font><font color="#0000BB">ClasseBase </font><font color="#007700">{<br /> </font><font color="#0000BB">public </font><font color="#007700">function </font><font color="#0000BB">teste</font><font color="#007700">() {<br /> echo </font><font color="#DD0000">"ClasseBase::teste() chamado\n"</font><font color="#007700">;<br /> }<br /> <br /> </font><font color="#0000BB">final public </font><font color="#007700">function </font><font color="#0000BB">maisTeste</font><font color="#007700">() {<br /> echo </font><font color="#DD0000">"ClasseBase::maisTeste() chamado\n"</font><font color="#007700">;<br /> }<br />}<br /><br />class </font><font color="#0000BB">ClasseFilha </font><font color="#007700">extends </font><font color="#0000BB">ClasseBase </font><font color="#007700">{<br /> </font><font color="#0000BB">public </font><font color="#007700">function </font><font color="#0000BB">maisTeste</font><font color="#007700">() {<br /> echo </font><font color="#DD0000">"ClasseFilha::maisTeste() called\n"</font><font color="#007700">;<br /> }<br />}<br /></font><font color="#FF8000">// Resulta em erro Fatal: Não pode sobrescrever método final ClasseBase::maisTeste()<br /></font><font color="#0000BB">?></font> </font> </code></TD ></TR ></TABLE ></DIV ></TD ></TR ></TABLE ><TABLE WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" CLASS="EXAMPLE" ><TR ><TD ><DIV CLASS="example" ><A NAME="AEN5952" ></A ><P ><B >Exemplo 19-30. Exemplo de classe Final</B ></P ><TABLE BORDER="0" BGCOLOR="#E0E0E0" CELLPADDING="5" ><TR ><TD ><code><font color="#000000"> <font color="#0000BB"><?php<br />final </font><font color="#007700">class </font><font color="#0000BB">ClasseBase </font><font color="#007700">{<br /> </font><font color="#0000BB">public </font><font color="#007700">function </font><font color="#0000BB">teste</font><font color="#007700">() {<br /> echo </font><font color="#DD0000">"Método ClasseBase::teste() chamado\n"</font><font color="#007700">;<br /> }<br /><br /> </font><font color="#FF8000">// Aqui não importa se você especificar a função como Final ou não<br /> </font><font color="#0000BB">final public </font><font color="#007700">function </font><font color="#0000BB">maisTeste</font><font color="#007700">() {<br /> echo </font><font color="#DD0000">"Método ClasseBase::maisTeste() chamado\n"</font><font color="#007700">;<br /> }<br />}<br /><br />class </font><font color="#0000BB">ClasseFilha </font><font color="#007700">extends </font><font color="#0000BB">ClasseBase </font><font color="#007700">{<br />}<br /></font><font color="#FF8000">// Resulta em erro Fatal: A classe ClasseFilha não pode herdar de uma classe Final (ClasseBase)<br /></font><font color="#0000BB">?></font> </font> </code></TD ></TR ></TABLE ></DIV ></TD ></TR ></TABLE ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="language.oop5.magic.html" ACCESSKEY="P" >Anterior</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" ACCESSKEY="H" >Principal</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="language.oop5.cloning.html" ACCESSKEY="N" >Próxima</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >Métodos Mágicos</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="language.oop5.html" ACCESSKEY="U" >Acima</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >Clonando objetos</TD ></TR ></TABLE ></DIV ></BODY ></HTML >