//代碼分為3個類，一個主類，一個服務器端，一個客戶端。以下是代碼：


import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;

public class BlueMIDlet extends MIDlet implements CommandListener
{
  static BlueMIDlet instance;
  BlueClientBox blueClientBox = null; //客戶端實例
  BlueServerBox blueServerBox = null; //服務端實例
  List list = null; //列表實例
  public static boolean isClose = false; //是否關閉連接
  public static Object lock = new Object();
  public BlueMIDlet()
  {
    instance = this;
  }

  public void startApp()
  {
    list = new List("藍牙聊天軟件", List.IMPLICIT);
    list.append("客戶端", null);
    list.append("服務端", null);
    list.setCommandListener(this);
    Display.getDisplay(this).setCurrent(list);
  }

  public void pauseApp()
  {
  }

  public void destroyApp(boolean unconditional)
  {
  }

  public static void quitApp()
  {
    instance.destroyApp(true);
    instance.notifyDestroyed();
    instance = null;
  }

  public void commandAction(Command command, Displayable displayable)
  {
    if (command == list.SELECT_COMMAND)
    {
      if (list.getSelectedIndex() == 0)
      { //運行客戶端
        blueClientBox = new BlueClientBox();
        Display.getDisplay(this).setCurrent(blueClientBox);
      }
      else if (list.getSelectedIndex() == 1)
      { //運行服務端
        blueServerBox = new BlueServerBox();
        Display.getDisplay(this).setCurrent(blueServerBox);
      }
    }
  }
}