?? 10905.htm
字號:
<html>
<!-- #BeginTemplate "/Templates/empolder-doc.dwt" -->
<head>
<!-- #BeginEditable "title" -->
<title>JAVA程序員必讀：基礎(chǔ)篇(5)---類和繼承 ---- |><| 太平洋電腦網(wǎng) -> 網(wǎng)絡(luò)學院* 開發(fā)教室</title>
<!-- #EndEditable -->
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<style type="text/css">
<!--
-->
</style>
<link rel="stylesheet" href="/pcedu/style/text.css">
<script language="JavaScript">
<!--
function MM_swapImgRestore() { //v3.0
var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}
function MM_preloadImages() { //v3.0
var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}
function MM_swapImage() { //v3.0
var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}
//-->
</script>
</head>
<body bgcolor="#FFFFFF" topmargin=0 leftmargin=0 marginheight="0" onLoad="MM_preloadImages('/images/lefton.gif','/images/topon.gif')">
<a name="top"></a>
<script language="JavaScript" src="/pcedu/script/top.js">
</script>
<table width=760 border=0 cellspacing=0 cellpadding=0 align=center>
<tr>
<td width=194 height="56"><a href=http://www.pconline.com.cn><img src=http://www.pconline.com.cn/images/pconlinelogo.gif width=162 height=35 vspace=10 border=0></a></td>
<td width=406 height="56">
<script language="JavaScript" src="/pcedu/script/empolder_ad.js">
</script>
</td>
<td width=158 align=right height="56">
<script language="JavaScript" src="/pcedu/script/empolder_ad1.js">
</script>
</td>
<td align=right width=2 height="56"> </td>
</tr>
</table>
<table border=0 cellpadding=0 cellspacing=0 width=760 align="center">
<tbody>
<tr valign=bottom>
<td rowspan=2 width=172><img height=32 src="/pcedu/images/pcedu_lo.gif"
width=172 border="0"></td>
<td height=30 rowspan=2>
<table cellpadding=0 cellspacing=0 width="588" bgcolor="#FFA000" background="/pcedu/images/e_menu5.gif" border="0">
<tbody>
<tr valign="bottom">
<td height="17">
<script language="JavaScript" src="/pcedu/script/title_empolder.js">
</script>
</td>
</tr>
</tbody>
</table>
</td>
</tr>
<tr></tr>
<tr bgcolor="#303880">
<td colspan=2 height=1 valign=bottom><img height=1
src="/pcedu/images/blank.gif" width=1></td>
</tr>
<tr>
<td colspan=2 height=5 valign=bottom><img height=5
src="/pcedu/images/blank.gif" width=1></td>
</tr>
</tbody>
</table>
<table width="760" cellspacing="0" cellpadding="0" align="center" height="614">
<tr>
<td width="170" height="616" valign="top" rowspan="2">
<table border="0" width="170" height="100%"
cellspacing="1" bgcolor="#000000">
<tr bgcolor="#F8F8D2">
<td width="100%" valign="top" height="307">
<script language="JavaScript" src="/pcedu/script/left_empolder.js">
</script>
</td>
</tr>
</table>
</td>
<td width="8" height="308"><img src="/pcedu/images/blank.gif" width="1" height="1"></td>
<td valign="top" height="444" width="582">
<table width="582" border="0" cellspacing="0" cellpadding="0" height="1" background="/images/line5.gif">
<tr>
<td height="1"></td>
</tr>
</table>
<!-- #BeginEditable "content" -->
<table width="582" border="0" cellspacing="8" cellpadding="0" background="/images/bg6.gif">
<tr>
<td valign="top">
<table width="100%" border="0" cellspacing="8" cellpadding="0" background="/images/point.gif">
<tr>
<td height="4" colspan="3"></td>
</tr>
<tr>
<td height="22" colspan="3">
<div align="center" class="title">JAVA程序員必讀：基礎(chǔ)篇(5)---類和繼承</div>
</td>
</tr>
<tr valign="bottom">
<td width="90" height="18">
<div align="right" class="gray"> </div>
<div class="gray"></div>
</td>
<td height="18">
<div align="center"><font color="#666666">編譯：ZSC/太平洋網(wǎng)絡(luò)學院</font></div>
</td>
<td width="90">
<div align="right" class="gray"><a href="mailto:tntst@pconline.com.cn">［責編:爆破手］</a></div>
</td>
</tr>
<tr valign="bottom">
<td colspan="3" height="0"></td>
</tr>
</table>
<p class="article"> 在前面的教程面向?qū)ο缶幊谈拍畹膬?nèi)容中你學習到了面向?qū)ο蟮母拍睢，F(xiàn)在我們來學習如何將這些概念用在JAVA中。在這部分教程中將介紹</p>
<ol>
<p>
<li class="article"><a href="#1">創(chuàng)建類</a></li>
<p></p>
<p>
<li class="article">管理繼承</li>
<p></p>
<p>
<li class="article">執(zhí)行嵌套類</li>
<p></p>
</ol>
<p></p>
<p class="article"><b><a name="1"></a>5.1 創(chuàng)建類</b></p>
<p class="article"> 這節(jié)中將介紹一個更大的類Stack的完整描述，并且描述一個從它繼承而來的對象的生命周期的類的所有組件。首先介紹構(gòu)造函數(shù)，然后介紹成員變量和方法。</p>
<p class="article"> 既然我們前面已經(jīng)介紹了如何創(chuàng)建和使用對象以及怎樣將對象從內(nèi)存中清除，現(xiàn)在該是我們介紹怎樣編寫類的時候了。這一節(jié)中將通過一個執(zhí)行LIFO（后入先出）堆棧的小例子來介紹類的組件。如圖22給處了類以及識別代碼的結(jié)構(gòu)：
</p>
<p></p>
<p class="article"><img src="/pcedu/empolder/gj/java/images/10717/Image60.gif" width=466 height=440></p>
<p></p>
<p class="article">（圖22）</p>
<p class="article"> 堆棧的執(zhí)行使用了另外的對象，即Vector來存儲它的元素。Vector是一個對象的數(shù)組，在需要空間的時候它為新對象分配內(nèi)存空間。這個Stack類是通過使用Vector來存儲它的元素的。但是它對Vector限定了LIFO，也就是說，你可以只增加元素并且從堆棧的頂部移出元素。</p>
<p align="center" class="article"><a href="10904_1.htm">[上一頁]</a>
<a href="10905_1.htm">[下一頁]</a></p>
</td>
</tr>
<tr bgcolor="#FF6600">
<td height="1"></td>
</tr>
<tr>
<td>
<table width="100%" border="0" cellspacing="0" cellpadding="0" background="/images/point.gif">
<tr>
<td colspan="2">
<p align="center" class="basicfont"><br>
如果您有什么疑問或看法請到 <a href="http://home.pconline.com.cn/cgi-bin/newbbs/bbs_login.cgi?loginname=guest&loginpasswd=guest" target="_blank" class="blue">精彩論壇</a>
發(fā)表意見<br>
</p>
<p align="center" class="basicfont"><font color=#ff0000><b class="article">未經(jīng)同意
不得轉(zhuǎn)載</b></font></p>
<p align="center" class="basicfont"> <span class="basicfont"><a href="javascript:history.back(-1)" onMouseOut="MM_swapImgRestore()" onMouseOver="MM_swapImage('image3','','/images/lefton.gif',1)"><img src="/images/LEFTOFF.GIF" border="0" name="image3" alt="返回" width="19" height="22"></a>
<a href="#top" onMouseOut="MM_swapImgRestore()" onMouseOver="MM_swapImage('image2','','/images/topon.gif',1)"><img src="/images/TOPOFF.GIF" name="image2" border="0" alt="頁首" width="22" height="22"></a></span></p>
</td>
</tr>
</table>
</td>
</tr>
</table>
<!-- #EndEditable -->
<table width="582" border="0" cellspacing="0" cellpadding="0" height="1" background="/images/line5.gif">
<tr>
<td height="1"></td>
</tr>
</table>
<img src="/images/blank.gif" width="1" height="24"><br>
<script
src=/script/hotfiles.js>
</script>
</td>
</tr>
</table>
<hr noshade size="2" width="760">
<p align="center">
<script language="JavaScript" src="/pcedu/script/title_edu.js">
</script>
<br>
<br>
版權(quán)所有©2000 太平洋電腦網(wǎng)<br>
<font face="Arial, Helvetica, sans-serif"> <a href=mailto:webmaster@pconline.com.cn>webmaster@pconline.com.cn
</a>
<script language="">
document.write("<a href=http://count.pconline.com.cn/admin/index.php target=_blank><img src=http://count.pconline.com.cn/count.php?user=pcedu&refer="+escape(document.referrer)+" border=0 width=0 height=0 alt='' ></a>");
</script>
</font></p>
</body>
<!-- #EndTemplate -->
</html>
?? 快捷鍵說明
復制代碼
Ctrl + C
搜索代碼
Ctrl + F
全屏模式
F11
切換主題
Ctrl + Shift + D
顯示快捷鍵
?
增大字號
Ctrl + =
減小字號
Ctrl + -