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<td width="90%"><font size="4" face="Verdana, Arial, Helvetica"><b>编码 MIDlet</b></font></td><td width="200" align="right"><font size="1" face="Verdana, Arial, Helvetica"><nobr>   第 2 页（共2 页）</nobr></font></td>
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<p>J2ME 平台由几层组成，最上层是 MIDP。我们在 MIDP 上面开发 J2ME 应用程序；因此，将应用程序命名为 <i>MIDlet</i>。每个 J2ME 应用程序都必须继承 <code>MIDlet</code> 类，以便应用程序管理软件可以控制它。
         </p>
<p>以下是我们 MIDlet 的蓝图：
         </p>
<pre>
<code style="font-family: Courier New, Courier, monospace; font-size: 12">
public class UniStock extends MIDlet implements CommandListener
{
  Display    display;

  private    List    menu;
  private    Command commandSelect;
  private    Command commandExit;
  ...

  public UniStock() {   // The constructor.
     ...
     // Data initialization.

     // Read saved data from RMS.

     // Create UI components and the first screen (menu).
  }

  public void startApp() {  // Enter the active state.
     // Display the first screen.
     display.setCurrent(menu);
  }

  public void pauseApp() {
  }

  public void destroyApp(boolean unconditional) {
     ...
     // Clean up data streams, network, etc.
     ...
  }

  public void commandAction(Command c, Displayable s) {
     notifyDestroyed();
  }

  // Other customized methods.
  ...
}
         </code>
</pre>
<p>当应用程序管理软件调用 <code>startApp()</code>、<code>pauseApp()</code> 或 <code>destroyApp()</code> 方法时，MIDlet 的状态将发生改变。例如，在调用 <code>pauseApp()</code> 时，MIDlet 从活动状态变为暂停状态。
         </p>
<p>因为那些方法会通知状态的改变，所以它们必需是轻量级的以便迅速返回。正如您在上面代码清单中看到的，我们将大多数初始化进程放在 <code>&lt;init&gt;</code> 和构造器中，而不是放在 <code>startApp()</code> 中。
         </p>
<p>
<b>警告：</b>在应用程序执行期间，随着状态的改变，可能会多次调用 <code>startApp()</code> 和／或 <code>pauseApp()</code>。您要小心，决不要将任何初始化代码放入这两个方法。
         </p>
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