FlameBay.java

import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.Panel;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.text.DecimalFormat;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextArea;

public class FlameBay extends JFrame{

    private JButton clearArea = new JButton("Clear");
    private JButton b1 = new JButton("Egg Noodles $1.00");
    private JButton b2 = new JButton("Spaghetti $0.95");
    private JButton b3 = new JButton("Ramen $0.50");
    private JButton b4 = new JButton("Beef $2.00");
    private JButton b5 = new JButton("Chicken $1.50");
    private JButton b6 = new JButton("Pork $1.25");
    private JButton b7 = new JButton("Kung Pao $0.50");
    private JButton b8 = new JButton("Teriyaki $0.25");
    private JButton b9 = new JButton("Curry $0.45");
    private JButton checkout = new JButton("Check Out");


    String defaultWidth = "\t\t              \r";
    JTextArea area = new JTextArea(25,20);

    public FlameBay()
    {
        FoodCallback callback = new FoodCallback(area);
        clearArea.addActionListener(callback);
        b1.addActionListener(callback);
        b2.addActionListener(callback);
        b3.addActionListener(callback);
        b4.addActionListener(callback);
        b5.addActionListener(callback);
        b6.addActionListener(callback);
        b7.addActionListener(callback);
        b8.addActionListener(callback);
        b9.addActionListener(callback);
        checkout.addActionListener(callback);


        JPanel panel = new JPanel();
        //Add buttons into the panel
        panel.add(b1);
        panel.add(b2);
        panel.add(b3);
        panel.add(b4);
        panel.add(b5);
        panel.add(b6);
        panel.add(b7);
        panel.add(b8);
        panel.add(b9);



        // Create grid layout , with column, row arguments
        GridLayout g = new GridLayout(3,3);
        // Set panel to the grid lay out
        panel.setLayout(g);

        // Panel is added to default border layout, default center location
        add(panel);
        add(clearArea, BorderLayout.NORTH);
        add(checkout, BorderLayout.SOUTH);
        add(area, BorderLayout.EAST);

        setTitle("FlameBay");
        setSize(650,410);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setVisible(true);


    }


    // Foodcallback is created, implementing necessary actionlistener interface
    private class FoodCallback implements ActionListener{

        // Text area created to receive object passed to FoodCallback
        private JTextArea area;
        private float total = 0;

        public FoodCallback(JTextArea area)
        {
            // Field initialized
            this.area = area;
        }

        @Override
        public void actionPerformed(ActionEvent e)
        {
            DecimalFormat twoDecimalPlace = new DecimalFormat("#0.00");

            //Button ID saved to variable
            JButton button = (JButton)e.getSource();
            //ID which button
            if(button == b1)
                total += 1.00;
            else if(button == b2)
                total += 0.95;
            else if(button == b3)
                total += 0.50;
            else if(button == b4)
                total += 2.00;
            else if(button == b5)
                total += 1.50;
            else if(button == b6)
                total += 1.25;
            else if(button == b7)
                total += 0.50;
            else if(button == b8)
                total += 0.25;
            else if(button == b9)
                total += 0.45;

            if(button == checkout)
                area.append("--- Cost: $" + twoDecimalPlace.format(total) + "\n");
            else if(button == clearArea)
            {
                area.setText(null);
                total = 0;
            }
            else
                area.append(button.getText()+"\n");

        }

    }

    public static void main(String[] args)
    {
        new FlameBay();

    }

}