// Example using Swing classes JRadioButton and JCheckBox
import java.applet.*;
import java.io.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class lunch extends JFrame implements ActionListener, ItemListener
{
  JCheckBox mayoBox;
  JCheckBox lettuceBox;
  JCheckBox tomatoBox;
  JCheckBox onionBox;
  boolean mayo, lettuce, tomato, onion;

  JRadioButton chickenRB;
  JRadioButton beefRB;
  JRadioButton veggieRB;
  boolean chicken, beef, veggie;
  ButtonGroup entree;

  JButton showButton;

  lunch()
  {
    setSize(300,300);
    setLocation(250,250);
    setVisible(true);
    Container c = getContentPane();
    c.setLayout(new BorderLayout());
    
    chickenRB = new JRadioButton("Chicken", true);
    chicken = true;
    beefRB = new JRadioButton("Beef", false);
    veggieRB = new JRadioButton("Vegetarian", false);

    // put the 3 mutually exclusive entree options in the same group
    // this means ONLY ONE of these can be true at any time
    entree = new ButtonGroup();
    entree.add(chickenRB);
    entree.add(beefRB);
    entree.add(veggieRB);

    // now deal with physical layout issues as always
    Panel entreepanel = new Panel();
    entreepanel.setLayout(new GridLayout(3, 1));
    entreepanel.add(chickenRB);
    entreepanel.add(beefRB);
    entreepanel.add(veggieRB);

    mayoBox = new JCheckBox("Mayonnaise");    
    lettuceBox = new JCheckBox("Lettuce");    
    tomatoBox = new JCheckBox("Tomatoes");     
    onionBox = new JCheckBox("Onions");
    Panel optionpanel = new Panel();
    optionpanel.setLayout(new GridLayout(4, 1));
    optionpanel.add(mayoBox);
    optionpanel.add(lettuceBox);
    optionpanel.add(tomatoBox);
    optionpanel.add(onionBox);

    showButton = new JButton("Display");
    Panel commandpanel = new Panel();
    commandpanel.setLayout(new FlowLayout(FlowLayout.CENTER));
    commandpanel.add(showButton);

    c.add(entreepanel, BorderLayout.WEST);
    c.add(optionpanel, BorderLayout.CENTER);
    c.add(commandpanel, BorderLayout.SOUTH);

    mayoBox.addItemListener(this);
    lettuceBox.addItemListener(this);
    tomatoBox.addItemListener(this);
    onionBox.addItemListener(this);

    beefRB.addItemListener(this);
    veggieRB.addItemListener(this);
    chickenRB.addItemListener(this);
    showButton.addActionListener(this);
  }

  public void itemStateChanged (ItemEvent i)
  {
    if (i.getSource() == beefRB)
      {
	if (i.getStateChange() == ItemEvent.SELECTED)
	  beef = true;
	else
	  beef = false;
      }
    if (i.getSource() == chickenRB)
      {
	if (i.getStateChange() == ItemEvent.SELECTED)
	  chicken = true;
	else
	  chicken = false;
      }
    if (i.getSource() == veggieRB)
      {
	if (i.getStateChange() == ItemEvent.SELECTED)
	  veggie = true;
	else
	  veggie = false;
      }
    if (i.getSource() == mayoBox)
      {
	if (i.getStateChange() == ItemEvent.SELECTED)
	  mayo = true;
	else
	  mayo = false;
      }
    else if (i.getSource() == lettuceBox)
      {
	if (i.getStateChange() == ItemEvent.SELECTED)
	  lettuce = true;
	else
	  lettuce = false;
      }
    else if (i.getSource() == tomatoBox)
      {
	if (i.getStateChange() == ItemEvent.SELECTED)
	  tomato = true;
	else
	  tomato = false;
      }
    else if (i.getSource() == onionBox)
      {
	if (i.getStateChange() == ItemEvent.SELECTED)
	  onion = true;
	else
	  onion = false;
      }
  }

  public void actionPerformed(ActionEvent a)
  {
    System.err.println("Current Meal Selection: ");
    if (chicken)
      System.err.println( "CHICKEN");
    else if (beef)
      System.err.println( "BEEF");
    else System.err.println( "VEGETARIAN");

    System.err.println("Options as follows:");

    if (mayo)
      System.err.println("\tWith Mayo");
    else  System.err.println("\tNo Mayo");

    if (lettuce)
      System.err.println("\tWith Lettuce");
    else  System.err.println( "\tNo Lettuce");

    if (onion)
      System.err.println("\tWith Onion");
    else  System.err.println("\tNo Onion");

    if (tomato)
      System.err.println("\tWith Tomato");
    else  System.err.println("\tNo Tomato");

  }
  public static void main (String args[])
  {
    lunch app = new lunch();
  }
}