j-stock-3-5.html

j2me构建股票系统,虽然不是纯粹的源码

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<a name="navskip"></a><td height="25" colspan="4"><img alt="3.高级用户界面设计" src="imagemaster/titlebar3.jpg" border="0" height="25" width="562"></td>
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<td width="90%"><font size="4" face="Verdana, Arial, Helvetica"><b>样本屏幕</b></font></td><td width="200" align="right"><font size="1" face="Verdana, Arial, Helvetica"><nobr>   第 5 页（共10 页）</nobr></font></td>
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<p>以下代码清单是我们的&ldquo;View Stock Details&rdquo;表单实现的简化版本。类 <code>FormView</code> 继承了树节点实现 <code>SubForm</code>。<code>FormView</code> 添加了它自己定制的命令、方法等。它还为自己定制的命令事件处理例程覆盖了 <code>commandAction()</code> 方法：</p>
<pre>
<code style="font-family: Courier New, Courier, monospace; font-size: 12">
import javax.microedition.lcdui.*;

/**
 * Form: Display view stock form.
 *
 * @version 		 1.0		 2002-JUL-07
 * @author		 JackWind Li Guojie (http://www.JackWind.net)
 */


public class FormView extends SubForm
{
  ChoiceGroup choiceStocks;
  Command     commandLive;
  Command     commandOneMonth;
  Command     commandThreeMonth;
  Command     commandSixMonth;
  Command     commandOneYear;

  int mode;   // 1 - Live info.
              // 2 - One month.
              // 3 - Three months.
              // 4 - Six months.
              // 5 - One year.

  Stock          s;   // Selected stock.


  StockLive      sl;
  StockHistory   sh;

  public FormView(String title, UniStock midlet, Displayable parent) {
    super(title, midlet, parent);

    commandLive = new Command("Live Info", Command.SCREEN, 1);
    commandOneMonth = new Command("One m. chart", Command.SCREEN, 1);
    commandThreeMonth = new Command("Three m. Chart", Command.SCREEN,
1);
    commandSixMonth = new Command("Six m. Chart", Command.SCREEN, 1);
    commandOneYear = new Command("One yr. Chart", Command.SCREEN, 1);

    addCommand(commandLive);
    addCommand(commandOneMonth);
    addCommand(commandThreeMonth);
    addCommand(commandSixMonth);
    addCommand(commandOneYear);

    choiceStocks = new ChoiceGroup("Select a stock: ",
Choice.EXCLUSIVE);
      for(int i=0; i&lt;midlet.stocks.size(); i++) {
        if(UniStock.DEBUG)
          UniStock.debug("Loading #" + i);
        Stock s = (Stock)midlet.stocks.elementAt(i);
        Exchange e = (Exchange)midlet.exchanges.elementAt((int)s.ex);
        choiceStocks.append( s.code + " [" + e.code + "]", null);
      }

      append(choiceStocks);

  }

  public void commandAction(Command c, Displayable ds) {
    super.commandAction(c, ds);

    if(c == commandLive || c == commandOneMonth || c==
commandThreeMonth
                        || c == commandSixMonth || c == commandOneYear)
{
      if(c == commandLive)
        mode = 1;
      else if(c == commandOneMonth)
        mode = 2;
      else if(c == commandThreeMonth)
        mode = 3;
      else if(c == commandSixMonth)
        mode = 4;
      else if(c == commandOneYear)
        mode = 5;

      if(choiceStocks == null || choiceStocks.getSelectedIndex() == -1)
{
          midlet.reportError("Nothing selected to view!");
          s = null;
          return;
      }else{
         s =

(Stock)(midlet.stocks.elementAt(choiceStocks.getSelectedIndex()));
      }

      Download dl = new Download(this, midlet);

      NextForm nextForm = new NextForm(c.getLabel(), midlet, this, dl);
      midlet.display.setCurrent(nextForm);

      Thread t = new Thread(dl);
      dl.registerListener(nextForm);
      t.start();
    }

  }


}

         </code>
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