import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.*;

public class Costam
{

	static int postcode;
	static int amount = 29;
	static int bill;

	static final JFrame frame = new JFrame();
	static final JLabel name = new JLabel();
	static final JFormattedTextField postcodeField = new JFormattedTextField(new Integer(0));
	static final JButton startShopping = new JButton("startShopping");

	static void Costam()
	{
		frame.setTitle("Costam");
		frame.setSize(800, 600);
		frame.setLocationRelativeTo(null);
		frame.setLayout(null);


		name.setText("Welcome to ...");
		name.setBounds(100, 100, 200, 20);
		frame.add(name);
		name.setVisible(true);
	}

	static void screen1 (Boolean flag)
	{
		name.setVisible(flag);
		postcodeField.setVisible(flag);
		startShopping.setVisible(flag);
	}



	public static void main(String[] args)
	{
		frame.setTitle("Costam");
		frame.setSize(800, 600);
		frame.setLocationRelativeTo(null);
		frame.setLayout(null);


		name.setText("Welcome to ...");
		name.setBounds(100, 100, 200, 20);
		frame.add(name);
		name.setVisible(true);

		postcodeField.setBounds(100, 300, 200, 20);
		postcodeField.setText(null);
		frame.add(postcodeField);
		postcodeField.setVisible(true);

		final JLabel products = new JLabel();
		products.setText("Products");
		products.setBounds(100, 100, 200, 20);
		frame.add(products);
		products.setVisible(false);

		final JLabel output = new JLabel();
		output.setBounds(100, 200, 200, 20);
		frame.add(output);
		output.setVisible(false);

		startShopping.setBounds(100, 200, 200, 20);
		startShopping.addActionListener(new ActionListener()
		{

			@Override
			public void actionPerformed(ActionEvent e)
			{
				screen1(false);
				postcode = (int) postcodeField.getValue();
				System.out.println(postcode);
				products.setVisible(true);

				bill = postcode * amount;
				output.setText(Integer.toString(bill));
				output.setVisible(true);

			}
		});
		frame.add(startShopping);
		startShopping.setVisible(true);





		frame.setVisible(true);

	}

}