Using JcheckBox in Java swing components

import java.awt.Container;

import java.awt.GridLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.BorderFactory;

import javax.swing.BoxLayout;

import javax.swing.ButtonGroup;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JList;

import javax.swing.JOptionPane;

import javax.swing.JPanel;

import javax.swing.JRadioButton;

import javax.swing.JCheckBox;

import javax.swing.JLabel;

import javax.swing.JScrollPane;

import javax.swing.ListSelectionModel;

import javax.swing.event.ListSelectionEvent;

import javax.swing.event.ListSelectionListener;

public class Pizzeria extends JFrame {

     

   protected final String SIZE_OPTIONS[]={"Small","Medium","Large","Extra Large"};

   protected final double SIZE_PRICE[]={7,9,11,14};

   protected final String DRINK_OPTIONS[]={"Soda","Tea","Bottled Water","Tap Water"};

   protected final double DRINK_PRICE[]={2,1.5,1.25,0};
   
   String tops[]={"Mushrooms","Onions","Cheese","Green Peppers","Pepperoni","Black Olives","Sausage"};
   
   private JCheckBox peppCheckBox, mushCheckBox;

  

   protected double pizzaCost,drinksCost,toppingsCost;
   

  

   public Pizzeria()

   {

       super("Pizza App");

       setDefaultCloseOperation(EXIT_ON_CLOSE);

         

       createAndDisplayUI();

   }

  

   //The UI is designed as follows. Components are added vertically one below aonohter on the

   //main panel. The 1st one to be added is a panel with 3 components (size, drinks and toppings)

   //which are horizontal. The 2nd one to be added to main panel is the buttons panel consisting

   //of 2 buttons.

   private void createAndDisplayUI()

   {

         

       //horizontal panel to hold the 3 panels for size, drinks and toppings

       JPanel horizontal=new JPanel();

       horizontal.setLayout(new GridLayout(1, 3));

      

       JPanel sizePanel=new JPanel();

       sizePanel.setLayout(new BoxLayout(sizePanel,BoxLayout.Y_AXIS));

       sizePanel.setBorder(BorderFactory.createTitledBorder("Pizza Size"));

      

      

       ButtonGroup group=new ButtonGroup();

       JRadioButton rb=null;
       

      

       //listener for size options selection, will set the basic cost of pizza
       //depending on size

       ActionListener sizeListener =new ActionListener() {

          

           @Override

           public void actionPerformed(ActionEvent e) {

                 

               setPizzaCost(e.getActionCommand());

           }

       };

       //create radio buttons for different sizes and group them and link them

       //with listener

       for(int i=0;i<SIZE_OPTIONS.length;i++)

       {

           rb=new JRadioButton(SIZE_OPTIONS[i]+"( $"+SIZE_PRICE[i]+" )");

           sizePanel.add(rb);

           group.add(rb);

           rb.addActionListener(sizeListener);

       }

       rb.setSelected(true); //make the last radio button as selected

       pizzaCost=SIZE_PRICE[3]; //since the last button is selected the cost is set appropriatel

     
      

       //create a panel for drinks options grouped with border and set teh action listener

       JPanel drinksPanel=new JPanel();

       drinksPanel.setLayout(new BoxLayout(drinksPanel,BoxLayout.Y_AXIS));

      

       drinksPanel.setBorder(BorderFactory.createTitledBorder("Drinks "));

       group=new ButtonGroup();

       //the actionlistener to drinks option will call the method to set

       //drinks cost

       ActionListener drinkListener =new ActionListener() {

          

           @Override

           public void actionPerformed(ActionEvent e) {

                 

               setDrinksCost(e.getActionCommand());

           }

       };

       String price;

       for(int i=0;i<DRINK_OPTIONS.length;i++)

       {

           if(DRINK_PRICE[i]==0)

               price="No Charge";

           else

               price="$"+DRINK_PRICE[i];

           rb=new JRadioButton(DRINK_OPTIONS[i]+"( "+price+" )");

           drinksPanel.add(rb);

           group.add(rb);

           rb.addActionListener(drinkListener);

       }

      

       rb.setSelected(true);

      

         

       //create a panel for the topppings list with scroll pane

       String toppings[]={"Mushrooms","Onions","Cheese","Green Peppers","Pepperoni","Black Olives","Sausage"};

        JPanel toppingsPanel=new JPanel();

        JList toppingsList=new JList(toppings);
        

        toppingsList.setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);

        toppingsList.setVisibleRowCount(6);
        
        
     
        JScrollPane toppingScroll=new JScrollPane(toppingsList);

        toppingsPanel.add(toppingScroll);

        toppingsPanel.setBorder(BorderFactory.createTitledBorder("Toppings"));

        //add list selection listenr to teh jlist object to set the toppings cost whenever

        //selection changes

        toppingsList.addListSelectionListener(new ListSelectionListener() {

          

           @Override

           public void valueChanged(ListSelectionEvent e) {

               toppingsCost=toppingsList.getSelectedIndices().length * 1;

              

           }

       });
        
//        String toppingz[]={"Mushrooms","Cheese","Pepperoni","Sausage"};
//        JPanel panel = new JPanel();
//        for (String topping : toppingz){
//        JCheckBox ct = new JCheckBox(topping);
//        panel.add(ct);
//       
//         }
        
        
        //create the buttons panel

        JPanel buttonsPanel=new JPanel();

        JButton exitBut,costBut;

        buttonsPanel.add(costBut=new JButton("Calculate Price"));

        buttonsPanel.add(exitBut=new JButton("Exit"));
        
        
        

      
        //now start laying out the panels appropirately

        horizontal.add(sizePanel);

        horizontal.add(drinksPanel);

        horizontal.add(toppingsPanel);
        
        //horizontal.add(panel);
        
        
      

        Container mainPanel=getContentPane();

        mainPanel.setLayout(new BoxLayout(mainPanel,BoxLayout.Y_AXIS));

      

        mainPanel.add(horizontal);

        mainPanel.add(buttonsPanel);

      

      

       //set up the action listeners for the 2 buttons

       costBut.addActionListener(new ActionListener() {

          

        
           public void actionPerformed(ActionEvent e) {

               showCost();

              

           }

       });

      

       exitBut.addActionListener(new ActionListener() {

          

           @Override

           public void actionPerformed(ActionEvent e) {

               System.exit(0);

              

           }

       });

       setSize(600,250);

       setVisible(true);
  

   }

     

   private void setDrinksCost(String drink)

   {

       for(int i=0;i<DRINK_OPTIONS.length;i++)

       {

           if(drink.startsWith(DRINK_OPTIONS[i] ))

           {

               drinksCost=DRINK_PRICE[i];

               return;

           }

       }

   }

  

   private void setPizzaCost(String size)

   {

       for(int i=0;i<SIZE_OPTIONS.length;i++)

       {

           if(size.startsWith(SIZE_OPTIONS[i]))

           {

               pizzaCost=SIZE_PRICE[i];

               return;

           }

       }

   }

  

   private void showCost()

   {

       double total=pizzaCost+drinksCost+toppingsCost;

       JOptionPane.showMessageDialog(this,"The total cost is "+total);

   }

   public static void main(String[] args) {

       Pizzeria u =new Pizzeria();

      

   }

}

 

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