Membangkitkan suara untuk objek Alert pada JAVA (J2ME)

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

public class SuaraAlert extends MIDlet
  implements CommandListener {
   
  private Display display;
  private List list;
  
  private final Command cmdKeluar =
    new Command("Keluar", Command.EXIT, 1);
  private final Command cmdOK =
    new Command("OK", Command.SCREEN, 1);
 
  public SuaraAlert() {
    display = Display.getDisplay(this);   

    list = new List("Tipe Alert", Choice.EXCLUSIVE);
    list.append("Info", null);
    list.append("Warning", null);
    list.append("Error", null);
    list.append("Confirmation", null);
    list.append("Alarm", null);
   
    list.addCommand(cmdOK);
    list.addCommand(cmdKeluar);
    list.setCommandListener(this);
  }
   
  public void startApp() {   
    display.setCurrent(list);
  }
   
  public void pauseApp() {
  }
   
  public void destroyApp(boolean unconditional) {
  }
   
  public void commandAction(Command c, Displayable s) {
    if (c == cmdKeluar) {
      destroyApp(false);
      notifyDestroyed();
    } else if (c == cmdOK) {       
      switch (list.getSelectedIndex()) {
        case 0: {
          displayAlert("Tipe INFO", AlertType.INFO);
          break;
        }
        case 1: {
          displayAlert("Tipe WARNING", AlertType.WARNING);
          break;
        }
        case 2: {
          displayAlert("Tipe ERROR", AlertType.ERROR); break;
        }
        case 3: {
          displayAlert("Tipe CONFIRMATION",
                        AlertType.CONFIRMATION);
          break;
        }
        case 4: {
          displayAlert("Tipe ALARM", AlertType.ALARM);
          break;
        }
      }
    } 
  }
 
  public void displayAlert(String text, AlertType type) {
    Alert alert =  new Alert("Suara dalam Alert", text,
                              null, type);
    display.setCurrent(alert);
    type.playSound(display);
  }   
}