j-j2me-9-6.shtml

这是一本介绍J2ME 编程的书籍,里面有具体的实现过程讲解,是很好的入门书籍

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     // --></script><a href="#navskip"><img border="0" alt="跳至主目录" src="../i/c.gif" width="1" height="1"></a><!--#include virtual="/developerWorks/inc/tuto-inc/tuto-header.inc" --><!--#include virtual="/developerWorks/inc/tuto-inc/tuto-java-header.inc" --><br x="7"><img src="imagemaster/masthead.jpg" alt="J2ME：循序渐进" width="500" height="40"></td>
  <td width="*" valign="bottom" align="right"><a border="0" href="../tutorial.zip"><img alt="下载教程 zip 文件" border="0" src="../i/icon-zip.gif" width="38" height="26"></a><a href=../tutorial_eng/index.shtml target=_blank><img alt="英文原文" border="0" src="../i/icon-source.gif" width="43" height="26"></a></td></tr><tr><td height="2" colspan="2"><img height="2" width="1" src="../i/c.gif"></td></tr></table><TABLE border="0" cellpadding="0" cellspacing="0" width="100%"><TR><TD width="150" height="1" bgcolor="#000000" colspan="6"><IMG alt="" height="1" width="150" src="../i/c.gif"></TD></TR><TR><TD background="../i/sw-gold.gif"><a border="0" href="index.shtml" onMouseOver="iOver('topmain'); iOver('bottommain'); self.status=mainblurb; return true;" onMouseOut="iOut('topmain'); iOut('bottommain'); self.status=''; return true;"><img alt="主菜单" border="0" src="../i/main.gif" name="topmain" width="77" height="15"></a></TD><TD background="../i/sw-gold.gif"><a border="0" onMouseOver="iOver('topsection'); iOver('bottomsection'); self.status=sectionblurb; return true;" onMouseOut="iOut('topsection'); iOut('bottomsection'); self.status=''; return true;" href="index9.shtml"><img alt="章节菜单" border="0" src="../i/section.gif" name="topsection" width="98" height="15"></a></TD><TD background="../i/sw-gold.gif"><a border="0" onMouseOver="iOver('topfeedback'); iOver('bottomfeedback'); self.status=feedbackblurb; return true;" onMouseOut="iOut('topfeedback'); iOut('bottomfeedback'); self.status=''; return true;" href="j-j2me-12-3.shtml"><img alt="给出此教程的反馈意见" border="0" src="../i/feedback.gif" name="topfeedback" width="80" height="15"></a></TD><TD width="100%" background="../i/sw-gold.gif"><img src="../i/c.gif" width="1" height="1"></TD><TD background="../i/sw-gold.gif"><a border="0" onMouseOver="iOver('topprevious'); iOver('bottomprevious'); self.status=previousblurb; return true;" onMouseOut="iOut('topprevious'); iOut('bottomprevious'); self.status=''; return true;" href="j-j2me-9-5.shtml"><img alt="上一屏" border="0" src="../i/previous.gif" name="topprevious" width="77" height="15"></a></TD><TD background="../i/sw-gold.gif"><img border="0" src="../i/xnext.gif" width="60" height="15"></TD></TR><TR><TD width="100%" colspan="5"></TD><TD width="108" height="1" bgcolor="#000000" align="right"><IMG alt="" height="1" width="108" src="../i/c.gif"></TD></TR><TR><TD colspan="5"></TD><TD align="right"><a border="0" onMouseOver="iOver('topnextsection'); iOver('bottomnextsection'); self.status=nextsectionblurb; return true;" onMouseOut="iOut('topnextsection'); iOut('bottomnextsection'); self.status=''; return true;" href="j-j2me-10-1.shtml"><img alt="下一章" src="../i/nextsection.gif" border="0" name="topnextsection" width="108" height="15"></a></TD></TR></TABLE><table bgcolor="ffffff" cellspacing="0" cellpadding="2" border="0" height="400" width="100%"><tr valign="bottom"><a name="navskip"></a><td height="25" colspan="4"><img border="0" height="25" width="562" src="imagemaster/titlebar9.jpg" alt="第九章：使用 KJava 事件处理的开发"></td></tr><tr><td bgcolor="ffffff" width="15">&nbsp;</td><td bgcolor="ffffff" width="12">&nbsp;</td><td valign="top" align="left" bgcolor="ffffff" width="*"><p><br x="7"><table cellspacing="0" cellpadding="0" border="0"><tr><td width="90%"><b><font size="4" face="Verdana, Arial, Helvetica">定义方法和事件处理程序</font></b></td><td width="200" align="right"><nobr><font size="1" face="Verdana, Arial, Helvetica">第 6 页（共 6 页）</font></nobr></td></tr></table><br x="7"><br x="7"><font size="2" face="Verdana, Arial, Helvetica"><p>  
        此外，<code style="font-family: Courier New, Courier, monospace; font-size: 12">main()</code>    
        定义了应用程序的主要入口。
</p><pre><code style="font-family: Courier New, Courier, monospace; font-size: 12">
      public static void main(String[] args)
</code></pre><p>默认的构造程序，<code style="font-family: Courier New, Courier, monospace; font-size: 12">Scribble   
</code> 初始化成员变量，清屏并画出初始框架。
</p><pre><code style="font-family: Courier New, Courier, monospace; font-size: 12">
      public Scribble()
</code></pre><p><code style="font-family: Courier New, Courier, monospace; font-size: 12">paint()</code>     方法负责更新或刷新显示。它使用类变量   
        <code style="font-family: Courier New, Courier, monospace; font-size: 12">g</code> -- 一个 <code style="font-family: Courier New, Courier, monospace; font-size: 12">Graphics</code> 对象，类似于 Java 2   
        AWT 中使用的 Graphics 对象。
</p><pre><code style="font-family: Courier New, Courier, monospace; font-size: 12">
      private void paint()
</code></pre><p><code style="font-family: Courier New, Courier, monospace; font-size: 12">penDown()</code>    
        方法执行事件处理程序来处理在屏幕上放置笔的事件。它通过 X 和 Y 坐标来定位。在 Scribble   
        中，程序测试 Clear   
        或 Exit 按钮是否被按下，如果按下的话，就处理相应的事件。
</p><pre><code style="font-family: Courier New, Courier, monospace; font-size: 12">
      public void penDown(int x, int y)
</code></pre><p><code style="font-family: Courier New, Courier, monospace; font-size: 12">keyDown()</code> 方法处理那些在 Palm 设备的即兴书画框内随手写下的东西。传送到这个方法中的整型值 <code style="font-family: Courier New, Courier, monospace; font-size: 12">keyCode  
        </code> 就是输入的字符键值。在  
         Scribble 应用程序中，我们存储了成员变量 <code style="font-family: Courier New, Courier, monospace; font-size: 12">lastKey  
        </code> 中被按下的键，然后调用 <code style="font-family: Courier New, Courier, monospace; font-size: 12">paint()</code> 方法刷新屏幕。
</p><pre><code style="font-family: Courier New, Courier, monospace; font-size: 12">
      public void keyDown(int keyCode)
</code></pre><p><code style="font-family: Courier New, Courier, monospace; font-size: 12">penMove()</code> 方法处理在屏幕上拖动笔的事件。在 Scribble 中，它负责用笔绘画。
</p><pre><code style="font-family: Courier New, Courier, monospace; font-size: 12">
      public void penMove(int x, int y)
</code></pre><p>使用的最后一个方法 <code style="font-family: Courier New, Courier, monospace; font-size: 12">clearDrawingArea()</code>，在用户按下 Clear  
        按钮时由 <code style="font-family: Courier New, Courier, monospace; font-size: 12">penDown</code>  
        事件处理程序调用。由于它仅在 <code style="font-family: Courier New, Courier, monospace; font-size: 12">Scribble </code>类的内部使用，所以 <code style="font-family: Courier New, Courier, monospace; font-size: 12">clearDrawingArea()  
        </code> 是一个私有方法。
</p><pre><code style="font-family: Courier New, Courier, monospace; font-size: 12">
      private void clearDrawingArea()
</code></pre><br x="7"></font></td></tr></table><TABLE border="0" cellpadding="0" cellspacing="0" width="100%"><TR><TD align="right" colspan="6"><a border="0" onMouseOver="iOver('topnextsection'); iOver('bottomnextsection'); self.status=nextsectionblurb; return true;" onMouseOut="iOut('topnextsection'); iOut('bottomnextsection'); self.status=''; return true;" href="j-j2me-10-1.shtml"><img alt="下一章" src="../i/nextsection.gif" border="0" name="bottomnextsection" width="108" height="15"></a></TD></TR><TR><TD width="100%" colspan="5"></TD><TD width="108" height="1" bgcolor="#000000" align="right"><IMG alt="" height="1" width="108" src="../i/c.gif"></TD></TR><TR><TD background="../i/sw-gold.gif"><a border="0" href="index.shtml" onMouseOver="iOver('topmain'); iOver('bottommain'); self.status=mainblurb; return true;" onMouseOut="iOut('topmain'); iOut('bottommain'); self.status=''; return true;"><img alt="主菜单" border="0" src="../i/main.gif" name="bottommain" width="77" height="15"></a></TD><TD background="../i/sw-gold.gif"><a border="0" onMouseOver="iOver('topsection'); iOver('bottomsection'); self.status=sectionblurb; return true;" onMouseOut="iOut('topsection'); iOut('bottomsection'); self.status=''; return true;" href="index9.shtml"><img alt="章节菜单" border="0" src="../i/section.gif" name="bottomsection" width="98" height="15"></a></TD><TD background="../i/sw-gold.gif"><a border="0" onMouseOver="iOver('topfeedback'); iOver('bottomfeedback'); self.status=feedbackblurb; return true;" onMouseOut="iOut('topfeedback'); iOut('bottomfeedback'); self.status=''; return true;" href="j-j2me-12-3.shtml"><img alt="给出此教程的反馈意见" border="0" src="../i/feedback.gif" name="bottomfeedback" width="80" height="15"></a></TD><TD width="100%" background="../i/sw-gold.gif"><img src="../i/c.gif" width="1" height="1"></TD><TD background="../i/sw-gold.gif"><a border="0" onMouseOver="iOver('topprevious'); iOver('bottomprevious'); self.status=previousblurb; return true;" onMouseOut="iOut('topprevious'); iOut('bottomprevious'); self.status=''; return true;" href="j-j2me-9-5.shtml"><img alt="上一屏" border="0" src="../i/previous.gif" name="bottomprevious" width="77" height="15"></a></TD><TD background="../i/sw-gold.gif"><img border="0" src="../i/xnext.gif" width="60" height="15"></TD></TR><TR><TD width="150" height="1" bgcolor="#000000" colspan="6"><IMG alt="" height="1" width="150" src="../i/c.gif"></TD></TR></TABLE><!--#include virtual="/developerWorks/inc/tuto-inc/tuto-footer.inc" --></body></html>