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Ellsa James I need help displaying a JFrame for my Java Project
I am trying to create a JFrame for my java project but cannot get the JFrame to display. I am getting a successful build but no JFrame appears. I have only been learning java for a couple of weeks and have written all the code while in class so I don't have a clue whats wrong or what a lot of the code does. The idea is to display a JFrame with some textfields and Combo boxes which will query a database and return a value. Its a program for a restaurant where the waiter will enter a starter,main and desert and the program gets the price of each dish from the database and returns the bill. Again I am a newbie to java and I don't know if I should have seperate classes that this program is calling or what is wrong so any help or pointers are much appreciated.
My code is below.
My code is below.
package restaurantbillcalculator;
// Exercise 26.12: RestaurantBillCalculator.java
// Calculates a table's bill.
import java.awt.*;
import java.awt.event.*;
import java.sql.*;
import java.text.*;
import java.util.*;
import javax.swing.*;
public class RestaurantBillCalculator extends JFrame
{
// JLabel for Restaurant
private JLabel restaurantJLabel;
// JPanel to display waiter information
private JPanel waiterJPanel;
// JLabel and JTextField for table number
private JLabel tableNumberJLabel;
private JTextField tableNumberJTextField;
// JLabel and JTextField for waiter name
private JLabel waiterNameJLabel;
private JTextField waiterNameJTextField;
// JPanel to display menu items
private JPanel menuItemsJPanel;
// JLabel and JComboBox for beverage
private JLabel beverageJLabel;
private JComboBox beverageJComboBox;
// JLabel and JComboBox for appetizer
private JLabel appetizerJLabel;
private JComboBox appetizerJComboBox;
// JLabel and JComboBox for main course
private JLabel mainCourseJLabel;
private JComboBox mainCourseJComboBox;
// JLabel and JComboBox for dessert
private JLabel dessertJLabel;
private JComboBox dessertJComboBox;
// JButton for calculate bill
private JButton calculateBillJButton;
// JLabel and JTextField for subtotal
private JLabel subtotalJLabel;
private JTextField subtotalJTextField;
// JLabel and JTextField for tax
private JLabel taxJLabel;
private JTextField taxJTextField;
// JLabel and JTextField for total
private JLabel totalJLabel;
private JTextField totalJTextField;
// constant for tax rate
private final static double TAX_RATE = 0.05;
// declare instance variables for database processing
private Connection myConnection;
private Statement myStatement;
private ResultSet myResultSet;
// declare instance variable ArrayList to hold bill items
private ArrayList billItems = new ArrayList();
// constructor
public RestaurantBillCalculator(
String databaseDriver, String databaseURL )
{
createUserInterface(); // set up GUI
} // end constructor
// create and position GUI components; register event handlers
private void createUserInterface()
{
// get content pane for attaching GUI components
Container contentPane = getContentPane();
// enable explicit positioning of GUI components
contentPane.setLayout( null );
// set up restaurantJLabel
restaurantJLabel = new JLabel();
restaurantJLabel.setBounds( 80, 8, 128, 24 );
restaurantJLabel.setText( "Restaurant" );
restaurantJLabel.setFont(
new Font( "SansSerif", Font.BOLD , 16 ) );
contentPane.add( restaurantJLabel );
// set up waiterJPanel
createWaiterJPanel();
contentPane.add( waiterJPanel );
// set up menuItemsJPanel
createMenuItemsJPanel();
contentPane.add( menuItemsJPanel );
// set up calculateBillJButton
calculateBillJButton = new JButton();
calculateBillJButton.setBounds( 92, 320, 90, 24 );
calculateBillJButton.setText( "Calculate Bill" );
calculateBillJButton.setBorder(
BorderFactory.createRaisedBevelBorder() );
contentPane.add( calculateBillJButton );
calculateBillJButton.addActionListener(
new ActionListener() // anonymous inner class
{
// event handler called when calculateBillJButton
// is clicked
public void actionPerformed( ActionEvent event )
{
calculateBillJButtonActionPerformed( event );
}
} // end anonymous inner class
); // end addActionListener
// set up subtotalJLabel
subtotalJLabel = new JLabel();
subtotalJLabel.setBounds( 28, 360, 56, 16 );
subtotalJLabel.setText( "Subtotal:" );
contentPane.add( subtotalJLabel );
// set up subtotalJTextField
subtotalJTextField = new JTextField();
subtotalJTextField.setBounds( 92, 360, 90, 20 );
subtotalJTextField.setEditable( false );
subtotalJTextField.setBorder(
BorderFactory.createLoweredBevelBorder() );
subtotalJTextField.setHorizontalAlignment( JTextField.RIGHT );
contentPane.add( subtotalJTextField );
// set up taxJLabel
taxJLabel = new JLabel();
taxJLabel.setBounds( 28, 392, 56, 16 );
taxJLabel.setText( "Tax:" );
contentPane.add( taxJLabel );
// set up taxJTextField
taxJTextField = new JTextField();
taxJTextField.setBounds( 92, 392, 90, 20 );
taxJTextField.setEditable( false );
taxJTextField.setBorder(
BorderFactory.createLoweredBevelBorder() );
taxJTextField.setHorizontalAlignment( JTextField.RIGHT );
contentPane.add( taxJTextField );
// set up totalJLabel
totalJLabel = new JLabel();
totalJLabel.setBounds( 28, 424, 56, 16 );
totalJLabel.setText( "Total:" );
contentPane.add( totalJLabel );
// set up totalJTextField
totalJTextField = new JTextField();
totalJTextField.setBounds( 92, 424, 90, 20 );
totalJTextField.setEditable( false );
totalJTextField.setBorder(
BorderFactory.createLoweredBevelBorder() );
totalJTextField.setHorizontalAlignment( JTextField.RIGHT );
contentPane.add( totalJTextField );
// set properties of application's window
setTitle( "Restaurant Bill Calculator" ); // set window title
setSize( 280, 500 ); // set window size
setVisible( true ); // display window
// ensure database connection is closed
// when user quits application
addWindowListener(
new WindowAdapter() // anonymous inner class
{
// event handler called when close button is clicked
public void windowClosing( WindowEvent event )
{
frameWindowClosing( event );
}
} // end anonymous inner class
); // end addWindowListener
} // end method createUserInterface
// set up waiterJPanel
private void createWaiterJPanel()
{
// set up waiterJPanel
waiterJPanel = new JPanel();
waiterJPanel.setBounds( 20, 48, 232, 88 );
waiterJPanel.setBorder( BorderFactory.createTitledBorder(
BorderFactory.createEtchedBorder(),
"Waiter Information" ) );
waiterJPanel.setLayout( null );
// set up tableNumberJLabel
tableNumberJLabel = new JLabel();
tableNumberJLabel.setBounds( 35, 24, 90, 16 );
tableNumberJLabel.setText( "Table number:" );
waiterJPanel.add( tableNumberJLabel );
// set up tableNumberJTextField
tableNumberJTextField = new JTextField();
tableNumberJTextField.setBounds( 128, 24, 88, 21 );
waiterJPanel.add( tableNumberJTextField );
// set up waiterNameJLabel
waiterNameJLabel = new JLabel();
waiterNameJLabel.setBounds( 35, 56, 90, 16 );
waiterNameJLabel.setText( "Waiter name:" );
waiterJPanel.add( waiterNameJLabel );
// set up waiterNameJTextField
waiterNameJTextField = new JTextField();
waiterNameJTextField.setBounds( 128, 56, 88, 21 );
waiterJPanel.add( waiterNameJTextField );
} // end method createWaiterJPanel
// create menuItemsJPanel
private void createMenuItemsJPanel()
{
// set up menuItemsJPanel
menuItemsJPanel = new JPanel();
menuItemsJPanel.setBounds( 20, 152, 232, 152 );
menuItemsJPanel.setBorder( BorderFactory.createTitledBorder(
BorderFactory.createEtchedBorder(), "Menu Items" ) );
menuItemsJPanel.setLayout( null );
// set up beverageJLabel
beverageJLabel = new JLabel();
beverageJLabel.setBounds( 8, 24, 80, 24 );
beverageJLabel.setText( "Beverage:" );
menuItemsJPanel.add( beverageJLabel );
// set up beverageJComboBox
beverageJComboBox = new JComboBox();
beverageJComboBox.setBounds( 88, 24, 128, 25 );
menuItemsJPanel.add( beverageJComboBox );
beverageJComboBox.addItemListener(
new ItemListener() // anonymous inner class
{
// event handler called when item in beverageJComboBox
// is selected
public void itemStateChanged( ItemEvent event )
{
beverageJComboBoxItemStateChanged( event );
}
} // end anonymous inner class
); // end addItemListener
// add items to beverageJComboBox
beverageJComboBox.addItem( "" );
loadCategory( "Beverage", beverageJComboBox );
// set up appetizerJLabel
appetizerJLabel = new JLabel();
appetizerJLabel.setBounds( 8, 56, 80, 24 );
appetizerJLabel.setText( "Appetizer:" );
menuItemsJPanel.add( appetizerJLabel );
// set up appetizerJComboBox
appetizerJComboBox = new JComboBox();
appetizerJComboBox.setBounds( 88, 56, 128, 25 );
menuItemsJPanel.add( appetizerJComboBox );
appetizerJComboBox.addItemListener(
new ItemListener() // anonymous inner class
{
// event handler called when item in appetizerJComboBox
// is selected
public void itemStateChanged( ItemEvent event )
{
appetizerJComboBoxItemStateChanged( event );
}
} // end anonymous inner class
); // end addItemListener
// add items to appetizerJComboBox
appetizerJComboBox.addItem( "" );
loadCategory( "Appetizer", appetizerJComboBox );
// set up mainCourseJLabel
mainCourseJLabel = new JLabel();
mainCourseJLabel.setText( "Main Course:" );
mainCourseJLabel.setBounds( 8, 88, 80, 24 );
menuItemsJPanel.add( mainCourseJLabel );
// set up mainCourseJComboBox
mainCourseJComboBox = new JComboBox();
mainCourseJComboBox.setBounds( 88, 88, 128, 25 );
mainCourseJComboBox.addItemListener(
new ItemListener() // anonymous inner class
{
// event handler called when item in mainCourseJComboBox
// is selected
public void itemStateChanged( ItemEvent event )
{
mainCourseJComboBoxItemStateChanged( event );
}
} // end anonymous inner class
); // end addItemListener
menuItemsJPanel.add( mainCourseJComboBox );
// add items to mainCourseJComboBox
mainCourseJComboBox.addItem( "" );
loadCategory( "Main Course", mainCourseJComboBox );
// set up dessertJLabel
dessertJLabel = new JLabel();
dessertJLabel.setBounds( 8, 120, 80, 24 );
dessertJLabel.setText( "Dessert:" );
menuItemsJPanel.add( dessertJLabel );
// set up dessertJComboBox
dessertJComboBox = new JComboBox();
dessertJComboBox.setBounds( 88, 120, 128, 25 );
menuItemsJPanel.add( dessertJComboBox );
dessertJComboBox.addItemListener(
new ItemListener() // anonymous inner class
{
// event handler called when item in dessertJComboBox
// is selected
public void itemStateChanged( ItemEvent event )
{
dessertJComboBoxItemStateChanged( event );
}
} // end anonymous inner class
); // end addItemListener
// add items to dessertJComboBox
dessertJComboBox.addItem( "" );
loadCategory( "Dessert", dessertJComboBox );
} // end method createMenuItemsJPanel
// add items to JComboBox
private void loadCategory(
String category, JComboBox categoryJComboBox )
{
} // end method loadCategory
// user select beverage
private void beverageJComboBoxItemStateChanged( ItemEvent event )
{
} // end method beverageJComboBoxItemStateChanged
// user select appetizer
private void appetizerJComboBoxItemStateChanged( ItemEvent event )
{
} // end method appetizerJComboBoxItemStateChanged
// user select main course
private void mainCourseJComboBoxItemStateChanged(
ItemEvent event )
{
} // end method mainCourseJComboBoxItemStateChanged
// user select dessert
private void dessertJComboBoxItemStateChanged( ItemEvent event )
{
} // end method dessertJComboBoxItemStateChanged
// user click Calculate Bill JButton
private void calculateBillJButtonActionPerformed(
ActionEvent event )
{
} // end method calculateBillJButtonActionPerformed
// calculate subtotal
private double calculateSubtotal()
{
return 0;
} // end method calculateSubtotal
// user close window
private void frameWindowClosing( WindowEvent event )
{
} // end method frameWindowClosing
// method main
public static void main( String[] args )
{
// check command-line arguments
if ( args.length == 2 )
{
// get command-line arguments
String databaseDriver = args[ 0 ];
String databaseURL = args[ 1 ];
// create new RestaurantBillCalculator
RestaurantBillCalculator application =
new RestaurantBillCalculator (
databaseDriver, databaseURL );
}
else
{
System.out.println( "Usage: java " +
"RestaurantBillCalculator databaseDriver databaseURL" );
}
} // end method main
} // end class RestaurantBillCalculator
Best Answer chosen by Ellsa JamesEllsa JamesSolved