Invoice. Java

package business;

import java.text.NumberFormat;

import java.util.Locale;

public class Invoice {

private String productName;

private int quantityPurchased;

private double pricePerItem;

public Invoice() {

setProductName("");;

setQuantityPurchased(1);

setPricePerItem(10);

}

public Invoice(String productName, int quantityPurchased, double pricePerItem) {

setProductName(productName);

setQuantityPurchased(quantityPurchased);

setPricePerItem(pricePerItem);

}

public String getProductName() {

return productName;

}

public void setProductName(String productName) {

if(productName != null && !productName.trim().isEmpty()) {

this.productName = productName;

}

else {

this.productName = "Unknown product";

}

}

public int getQuantityPurchased() {

return quantityPurchased;

}

public void setQuantityPurchased(int quantityPurchased) {

if (quantityPurchased >= 1 && quantityPurchased

this.quantityPurchased = quantityPurchased;

}

else if (quantityPurchased

this.quantityPurchased = 1;

}

else {

this.quantityPurchased = 1000;

}

}

public double getPricePerItem() {

return pricePerItem;

}

public void setPricePerItem(double pricePerItem) {

if (pricePerItem >= 10 && pricePerItem

this.pricePerItem = pricePerItem;

}

else if (pricePerItem

this.pricePerItem = 10;

}

else {

this.pricePerItem = 10000;

}

}

public double getTotalCost() {

return pricePerItem * quantityPurchased;

}

@Override

public String toString() {

NumberFormat cf = NumberFormat.getCurrencyInstance(Locale.US);

StringBuilder str = new StringBuilder();

str.append("Invoice Information:");

str.append(" Product Name: ");

str.append(productName);

str.append(" Number of items: ");

str.append(quantityPurchased);

str.append(" Price Per Item: ");

str.append(cf.format(pricePerItem));

str.append(" Total cost: ");

str.append(cf.format(getTotalCost()));

return str.toString();

}

}

You have to modify below code (only modify to do comment program work);

Invoice_GUI.java

package presentation;

import business.Invoice; import java.awt.Dimension; import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import java.awt.GridLayout; import java.awt.Insets; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JOptionPane; import javax.swing.JTextArea; import javax.swing.JTextField;

public class Invoice_GUI extends JFrame { public static final int WINDOW_WIDTH = 450; public static final int WINDOW_HEIGHT = 400; private Invoice aInvoice; private JButton btnCalculate; private JButton btnClear; private JButton btnExit; private JTextField txtProductName; private JTextField txtQuantity; private JTextField txtCostPerItem; private JTextArea txtTotalCost; public Invoice_GUI() { super(); createPanel(); setFrame(); } private void createPanel() { super.setLayout(new GridLayout(0, 2)); //TODO: create the GUI components and add them to the form for: /* 1. Product name label 2. Product name textfield (name: txtProductName) 3. Quantity label 4. Quanitity textfield (name: txtQuantity) 5. Item cost label 6. Item cost textfield (name: txtCost) 7. JButton to calculate the cost (name: btnCalculate 8. Add a CalculateHandler handler object to the btnCalculate addActionListener */ } private void setFrame() { Dimension windowSize = new Dimension(WINDOW_WIDTH, WINDOW_HEIGHT);

super.setTitle("Week 2 Practice Program--Invoice"); super.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

super.setSize(windowSize); super.setMinimumSize(windowSize); super.setMaximumSize(windowSize);

super.setLocationRelativeTo(null); super.setVisible(true); } private class CalculateHandler implements ActionListener { @Override public void actionPerformed(ActionEvent ae) { boolean valid; if (aInvoice == null) { //TODO: create a new invoice object aInvoice = new Invoice(); } aInvoice.setProductName(txtProductName.getText());

try { int quanity = Integer.parseInt(txtQuantity.getText()); aInvoice.setQuantityPurchased(quanity); valid = true; } catch (NumberFormatException ex) { JOptionPane.showMessageDialog(null, "Quantity needs to be a number between 1 and 1000", "Illegal Quanity value", JOptionPane.ERROR_MESSAGE); valid = false; txtQuantity.setText(""); txtQuantity.requestFocus(); } if (valid) { try { double cost = 0; //TODO: write the state to extract the double value from the txtCost field aInvoice.setPricePerItem(cost); } catch (NumberFormatException ex) { valid = false; JOptionPane.showMessageDialog(null, "Costs needs to be a number between 10 and 10000", "Illegal Cost value", JOptionPane.ERROR_MESSAGE); valid = false; txtCostPerItem.setText(""); txtCostPerItem.requestFocus(); } } if (valid) { //TODO: using the toString method of the invoice object to set the output text } } } }

Week 2 Practice Program-Invoice Product Name Coffee Cup Product Quantity (1 to 1000) 100 Item cost (10 to 10000) 10 Invoice Information: Product Name: Coffee Cup Number of items: 100 Price Per Item: $10.00 Total cost: $1,000.00 Total cost Calculate Total Cost