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<div align="center" class="title">JAVA程序員必讀：基礎篇（2）面向對象編程概念</div>
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<div align="center"><font color="#666666">編譯：ZSC/太平洋網絡學院</font></div>
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<div align="right" class="gray"><a href="mailto:tntst@pconline.com.cn">［責編:爆破手］</a></div>
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<p class="article"></p>
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<p class="article"><b>2.7.4ClickMe Applet中的消息</b></p>
<p class="article">就如所知道的，對象A可以使用消息來請求對象B做一些事情，一個消息有三個組成部分： </p>
<ol>
<p>
<li class="article"><span class="coffee">消息被尋址的對象</span></li>
<p></p>
<p>
<li class="article"><span class="coffee">要執行執行方法的名字</span></li>
<p></p>
<p>
<li class="article"><span class="coffee">方法需要的任何參數</span></li>
<p></p>
</ol>
<dir>
<p class="article"> 在ClickMe applet種有以下兩行這樣的代碼：</p>
</dir>
<p class="article">g.setColor(Color.white);</p>
<p class="article">g.fillRect(0, 0, getSize().width - 1, getSize().height
- 1);</p>
<p class="article"> 這兩個消息都是從applet到名為g的對象。其中g是一個圖形對象，它知道怎樣在屏幕上簡單畫一些形狀或者文本。這個對象在瀏覽器指示applet來畫的時候提供了applet。上面代碼的第一行設置顏色為白色，第二行是填充一個指定大小的矩形區域，它的顏色為白色。如圖13所示，是一個消息的三個組成部分：</p>
<p></p>
<p class="article"><img src="../images/10717/Image51.gif" width=280 height=83></p>
<p class="article">（圖13）</p>
<p> </p>
<p class="article"></p>
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<p align="center" class="basicfont"><font color=#ff0000><b class="article">未經同意
不得轉載</b></font></p>
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