package cmd;import core.*;import db.*;import java.util.List;import java.util.ArrayList;import javax.swing.JOptionPane;public class MDeleteCommand extends MDatabaseCommand{    private static final String [] PARAM_NAMES =    { "id" };    private static final String [] PARAM_PROMPTS =    { "Enter reservation id:" };    public MDeleteCommand ()	throws java.io.IOException    {	super ();    }    public String [] getParameterNames ()    {	return PARAM_NAMES;    }        public String [] getParameterPrompts ()    {	return PARAM_PROMPTS;    }    protected void executeDatabaseCommand (HotelDB database)    {	int id = Integer.parseInt (getParameter ("id"));        // empty list value indicates that it worked        String title = "Delete reservation: " + getParameter ("id");	if (database.deleteReservation (id))            displayResults (title, new ArrayList ());        // null value indicates no such reservation        else            displayResults (title, null);    }    protected void displayResultsText (String title, List flag)    {        if (flag == null)            System.out.println ("No such reservation");        else            System.out.println ("Reservation deleted.");    }    protected void displayResultsGUI (String title, List flag)    {        if (flag == null)            JOptionPane.showMessageDialog(getFrame(), title,                                       "Delete Command Error. No such reservation.",                                       JOptionPane.ERROR_MESSAGE);        else            JOptionPane.showMessageDialog(getFrame(), title,                                       "Deleted Command Succeeded",                                       javax.swing.JOptionPane.INFORMATION_MESSAGE);    }    public String getMenuName ()    { return "Delete..."; }    public String getName ()    { return "delete"; }    public String getDescription ()    { 	return "Deletes a reservation by id";     }    public Command makeInstance ()    {	try	{	    return new MDeleteCommand ();	} catch (java.io.IOException e)	{	    return null;	}    }}