What am I missing to run this program? Whenever I run it, it says I need to use

Question

What am I missing to run this program? Whenever I run it, it says I need to use an "ant build", however it says I don't have an ant build file to run. Please tell me what I need to do to run this!

import javax.swing.*;

import java.awt.*;

import java.awt.event.*;

import java.text.*;

import java.util.*;

@SuppressWarnings("serial")

public class ShoppingFrame extends JFrame {

private ShoppingCart selections;

private JTextField total;

public ShoppingFrame(ArrayList products) {

// create frame and order list

setTitle("CS Gift Catalog");

setDefaultCloseOperation(EXIT_ON_CLOSE);

selections = new ShoppingCart();

// Just making sure we're using the Iverson version:

if (!(selections instanceof ArrayList))

throw new RuntimeException("This quarter I require an ArrayList");

// set up text field with order total

total = new JTextField("$0.00", 12);

total.setEditable(false);

total.setEnabled(false);

total.setDisabledTextColor(Color.BLACK);

JPanel p = new JPanel();

p.setBackground(Color.blue);

JLabel l = new JLabel("Order Total");

l.setForeground(Color.YELLOW);

p.add(l);

p.add(total);

add(p, BorderLayout.NORTH);

p = new JPanel(new GridLayout(products.size(), 1));

removeDuplicates(products);

for (Sku i : products) {

addItem(i, p); // add selections to panel

}

add(p, BorderLayout.CENTER); // add panel to frame

p = new JPanel();

add(makeCheckBoxPanel(), BorderLayout.SOUTH);

// adjust size to just fit

pack();

}

// Should probably use Set rather than Array List, but this is Chapter 10

private void removeDuplicates(ArrayList products) {

for (Sku i: products) {

if (products.indexOf(i) != products.lastIndexOf(i))

products.remove(i);

}

}

// Sets up the "discount" checkbox for the frame

private JPanel makeCheckBoxPanel() {

JPanel p = new JPanel();

p.setBackground(Color.blue);

final JCheckBox cb = new JCheckBox("qualify for discount");

p.add(cb);

cb.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

selections.setDiscount(cb.isSelected());

updateTotal();

}

});

return p;

}

// adds a product to the panel, including a textfield for user input of

// the quantity

private void addItem(final Sku product, JPanel p) {

JPanel sub = new JPanel(new FlowLayout(FlowLayout.LEFT));

sub.setBackground(new Color(0, 180, 0));

final JTextField quantity = new JTextField(3);

quantity.setHorizontalAlignment(SwingConstants.CENTER);

quantity.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

updateItem(product, quantity);

quantity.transferFocus();

}

});

quantity.addFocusListener(new FocusAdapter() {

public void focusLost(FocusEvent e) {

updateItem(product, quantity);

}

});

sub.add(quantity);

JLabel l = new JLabel("" + product);

l.setForeground(Color.white);

sub.add(l);

p.add(sub);

}

// When the user types a new value into one of the quantity fields,

// parse the input and update the ShoppingCart. Display an error

// message if text is not a number or is negative.

private void updateItem(Sku product, JTextField quantity) {

int number;

String text = quantity.getText().trim();

try {

number = Integer.parseInt(text);

} catch (NumberFormatException error) {

number = 0;

}

if (number <= 0 && text.length() > 0) {

Toolkit.getDefaultToolkit().beep();

quantity.setText("");

number = 0;

}

selections.add(new NumSelected(product, number));

updateTotal();

}

// reset the text field for order total

private void updateTotal() {

double amount = selections.getTotal();

total.setText(NumberFormat.getCurrencyInstance().format(amount));

}

// Below used to be separate ShoppingMain, now an easier entry point:

public static void main(String[] args) {

// the Catalog is a simple Array List of Items:

ArrayList list = new ArrayList();

list.add(new Sku("silly putty", 3.95, 10, 19.99));

list.add(new Sku("silly string", 3.50, 10, 14.95));

list.add(new Sku("bottle o bubbles", 0.99));

list.add(new Sku("Nintendo Wii system", 389.99));

list.add(new Sku("Mario Computer Science Party 2 (Wii)", 49.99));

list.add(new Sku("Don Knuth Code Jam Challenge (Wii)", 49.99));

list.add(new Sku("Computer Science pen", 3.40));

list.add(new Sku("Rubik's cube", 9.10));

list.add(new Sku("Computer Science Barbie", 19.99));

list.add(new Sku("'Java Rules!' button", 0.99, 10, 5.0));

list.add(new Sku("'Java Rules!' bumper sticker", 0.99, 20, 8.95));

ShoppingFrame f = new ShoppingFrame(list);

f.setVisible(true);

}

}

Explanation / Answer

First of all, it needs 2 more classes Sku and ShoppingCart. Do you have these classes too ?

Which IDE do you use? You can use eclipse for your java development. Its very simple and easy to use. Below is the link to download eclipse. Make sure you have the other 2 classes as well.

http://www.eclipse.org/downloads/packages/eclipse-ide-java-developers/oxygenr

Let me know if you need any further help.

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