Retail Calculator

package retail.calculator; import java.awt.*; import java.awt.event.*; import java.text.DecimalFormat; import javax.swing.*; public class RetailCalculator extends JFrame { //create ojects JLabel department; JLabel number; JLabel name; JLabel price; JLabel discount; JLabel sale; JComboBox dept; JTextField itemNum; JTextField itemName; JTextField itemPrice; JTextField itemDisc; JTextField salePrice; JButton calculate; JButton clear; public RetailCalculator() { //set object variables super("Retail Sales Calculator"); //window title setSize(250, 250); //set window size setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //window close GridLayout grid = new GridLayout(7, 2); setLayout(grid); department = new JLabel("Department"); dept = new JComboBox(); dept.addItem("Select"); dept.addItem("Apperal"); dept.addItem("Automotive"); dept.addItem("Cosmetics"); dept.addItem("Jewlry"); dept.addItem("Pets"); dept.addItem("Pharmacy"); //add ItemListener...combobox and jtextfield dept.addItemListener(new ItemListener() { public void itemStateChanged(ItemEvent ie) { String str = (String)dept.getSelectedItem(); itemNum.setText(str); } //end public void }); //end item listener number = new JLabel("Item Number"); itemNum = new JTextField(10); name = new JLabel("Item Name"); itemName = new JTextField(10); price = new JLabel("Original Price"); itemPrice = new JTextField(10); discount = new JLabel("Discount"); itemDisc = new JTextField(10); sale = new JLabel("Sale Price");