import javax.microedition.midlet.*;
import javax.microedition.io.Connector;
import javax.microedition.io.file.*; //тут не хватало "file.*"
import java.io.*; //вот тут не хватало этого пакета

public class Main extends MIDlet
{

public Main()
{
}


public void startApp()
{

 try {
      FileConnection filecon=(FileConnection)Connector.open("file:///SDCard/mynewfile.txt",Connector.READ);
      filecon.close();
     }catch(IOException ioe) {}


}

public void pauseApp()
{}

public void destroyApp(boolean unconditional)
{}


}