listing 8.1.java

关于j2me的midlet事例源码, 能帮助你晋级!

import javax.microedition.rms.*;
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import java.io.*;
public class RecordStoreExample 
            extends MIDlet implements CommandListener
{
  private Display display;
  private Alert alert;
  private Form form; 
  private Command exit; 
  private Command start;
  private RecordStore recordstore = null;
  private RecordEnumeration recordenumeration = null;
  public RecordStoreExample ()
  {
    display = Display.getDisplay(this);
    exit = new Command("Exit", Command.SCREEN, 1);
    start = new Command("Start", Command.SCREEN, 1);
    form = new Form("Record Store");
    form.addCommand(exit);
    form.addCommand(start);
    form.setCommandListener(this);
  }
  public void startApp()
  {
    display.setCurrent(form);
  }
  public void pauseApp()
  {
  }
  public void destroyApp( boolean unconditional )
  {
  }
  public void commandAction(Command command, Displayable displayable)
  {
    if (command == exit)
    {
      destroyApp(true);
      notifyDestroyed();
    }
    else if (command == start)
    {
      try
      {
        recordstore = RecordStore.openRecordStore("myRecordStore", 
                                                    true );
      }
      catch (Exception error)
      {
        alert = new Alert("Error Creating", error.toString(), 
                           null, AlertType.WARNING); 
        alert.setTimeout(Alert.FOREVER); 
        display.setCurrent(alert);
      }
      try
      {
        recordstore.closeRecordStore();
      }
      catch (Exception error)
      {
        alert = new Alert("Error Closing", error.toString(), 
                          null, AlertType.WARNING); 
        alert.setTimeout(Alert.FOREVER); 
        display.setCurrent(alert);
      }
      if (RecordStore.listRecordStores() != null)
      {
        try
        {
          RecordStore.deleteRecordStore("myRecordStore");
        }
        catch (Exception error)
        {
         alert = new Alert("Error Removing", error.toString(), 
                           null, AlertType.WARNING); 
         alert.setTimeout(Alert.FOREVER); 
         display.setCurrent(alert);
        }
      }      
    }
  }     
}