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);

}

}

<><>SKU CLASS<><>

public class Sku {

public Sku(String name, double price){

}

public Sku(String name, double price, int quantity, double bulkPrice){

}

public void priceFor(int quantity){

}

public void equals(boolean f){

}

public String toString(){

return String.format("toString on NumSelected works!");

}

}

<><>NumSelected<><>

public class NumSelected {

public NumSelected(){

}

public void getPrice(){

}

public void getSku(){

}

public String toString(){

return String.format("toString on NumSelected works!");

}

}

<><>ShoppingCart.java<><>

public class ShoppingCart {

public ShoppingCart(){

}

public void getTotal(){

}

public void add(NumSelected M){

}

public void addDiscount(boolean discount){

}

public String toString(){

return String.format("toString on ShoppingCart works!");

}

}

<><> MAIN CLASS <><>

import java.io.FileNotFoundException;

// CS211 BC, W.P. Iverson

// September 2016

public class SimpleConsoleTest {

public static void main(String[] args) throws FileNotFoundException {

Sku one = new Sku("book",13.0);

Sku two = new Sku("book",13);

Sku three = new Sku("another",42);

System.out.println(one.equals(two)); // true

System.out.println(one.equals(three)); // false

System.out.println(two); // book, $13.00

System.out.println(two.priceFor(123)); // 1599

ShoppingCart basket = new ShoppingCart();

System.out.println(basket.size()); // 0

NumSelected five = new NumSelected(two,5);

NumSelected six = new NumSelected(three,4);

basket.add(five);

basket.add(six);

System.out.println(basket.getTotal()); // 233

six = new NumSelected(three,1);

basket.add(six);

System.out.println(basket.getTotal()); // 107

basket.setDiscount(true);

System.out.println(basket.getTotal()); // 96.3

}

}