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<td width="90%"><font size="4" face="Verdana, Arial, Helvetica"><b>解决方案：Dialog 类</b></font></td><td width="200" align="right"><font size="1" face="Verdana, Arial, Helvetica"><nobr>   第 9 页（共10 页）</nobr></font></td>
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<p>注：<code>Dialog</code> 不是 CLDC 或 MIDP 中的标准类。JackWind 小组的开发人员创建了如下列清单所示的 <code>Dialog</code> 类：
         </p>
<pre>
<code style="font-family: Courier New, Courier, monospace; font-size: 12">
/**
 * FileName:    Dialog.java
 * Version:     1.0
 * Create on:   2001-JUN-01
 *
 * All rights reserved by JackWind Group. (www.JackWind.net)
 */

import javax.microedition.lcdui.*;

/**
 * Dialog: A class simulating dialog for UI.
 *
 * @version 		 1.0 2001-JUN-01
 * @author		 		 JackWind Group (http://www.JackWind.net)
 */

class DialogListener {
  public void onOK() {}
  public void onYES() {}
  public void onNO() {}
  public void onCANCEL() {}
  public void onCONFIRM() {}
  // RETRY.
  // ABORT.
}


public class Dialog extends Form implements CommandListener{
  Display            display;
  DialogListener     dll;

  Displayable        parent;

  public static final int OK           = 1;

  public static final int YES          = 2;
  public static final int NO           = 4;
  public static final int CANCEL       = 8;
  public static final int CONFIRM      = 16;

  Command cmOK;
  Command cmYES;
  Command cmNO;
  Command cmCANCEL;

  Command cmCONFIRM;

  StringItem   text;

 /**
  * The constructor.
  *@param title     Form title, must not be null
  * @param text      Form text, must not be null
  * @param mode      Control commands. int &gt; 0
  * @param MIDlet    Our midlet, must not be null
  * @param DialogListener dll, can be null
  * @param parent    The parent form, must not be null
  */
  public Dialog(String title, String text, int mode, MIDlet midlet,
 		 		 		 		 DialogListener dll, Displayable parent) {
    super(title);
    this.dll = dll;
    this.text = new StringItem(null, text);
    this.display = Display.getDisplay(midlet);
    this.parent = parent;

    if( (mode &amp; OK) != 0) {
      cmOK = new Command("OK", Command.SCREEN, 1);
      addCommand(cmOK);
    }

    if( (mode &amp; YES) != 0) {
      cmYES = new Command("Yes", Command.SCREEN, 1);
      addCommand(cmYES);
    }

    if( (mode &amp; NO) != 0) {
      cmNO = new Command("No", Command.SCREEN, 1);
      addCommand(cmNO);
    }

    if( (mode &amp; CANCEL) != 0) {
      cmCANCEL = new Command("Cancel", Command.SCREEN, 1);
      addCommand(cmCANCEL);
    }

    if( (mode &amp; CONFIRM) != 0) {
      cmCONFIRM = new Command("Confirm", Command.SCREEN, 1);
      addCommand(cmCONFIRM);
    }

    append(text);
    setCommandListener(this);
  }

  public void commandAction(Command c, Displayable s) {
    if(dll != null) {
      if(c == cmOK)
        dll.onOK();
      else if(c == cmYES)
        dll.onYES();
      else if(c == cmNO)
        dll.onNO();
      else if(c == cmCANCEL)
        dll.onCANCEL();
      else if(c == cmCONFIRM)
        dll.onCONFIRM();
   }

   midlet.display.setCurrent(parent);

  }

}

         </code>
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