JAVA：传递给另一个类时为空值

Question

我正在开发一个将数组传递给另一个类的程序。但是，当我尝试加载我传递一组数组值的类时，其中没有值。看我的代码：

Menu.java

public class Menu extends javax.swing.JFrame {

        private String[] menu;
        private Globals vars = new Globals();
        private DefaultTableModel grill;
        private DefaultTableModel seafoods;
        private DefaultTableModel rice;
        private DefaultTableModel drinks;
        private int menuCount;

        public Menu() {
            initComponents();
            this.setLocationRelativeTo(null);
            menuCount = vars.countMenu();
            menu = new String[menuCount];
            menu = vars.setMenu();
            grill = (DefaultTableModel) jTable1.getModel();
            seafoods = (DefaultTableModel) jTable2.getModel();
            rice = (DefaultTableModel) jTable3.getModel();
            drinks = (DefaultTableModel) jTable4.getModel();

            /*** SOME CODES HERE ***/

            /*** item_name, item_code, item_qty, item_price are arrays ***/
            /*** I have already tested them and they have values ***/


            if (noValue > 0) {
                JOptionPane.showMessageDialog(null, "Please input quantity");
                return;
            }

            if (count == 0) {
                JOptionPane.showMessageDialog(null, "Plese select some items");
                return;
            } else {
                Transaction trns = new Transaction();
                //JOptionPane.showMessageDialog(null, count);
                trns.setSelectedItems(item_name, item_code, item_qty, item_price, count);
                trns.setVisible(true);
                //this.setVisible(false);
            }
        }

        public static void main(String args[]) {
            java.awt.EventQueue.invokeLater(new Runnable() {
                public void run() {
                    new Menu().setVisible(true);
                }
            });
        }

Transaction.java

public class Transaction extends javax.swing.JFrame {

    private String[] itemcode;
    private double[] qty;
    private double[] price;
    private String[] items;
    private String[] info;
    private static Scanner iRead;
    private int count;

    public Transaction() {
        initComponents();
        this.setLocationRelativeTo(null);

        itemcode = new String[count];

        DefaultListModel listModel = new DefaultListModel();
        String header = "| Item Code | Item Name | Price | Quantity";
        listModel.addElement(header);
        JOptionPane.showMessageDialog(null, count);

        lsItems.setModel(listModel);
    }
    public void setSelectedItems(String[] itm, String[] cd, double[] qnty, double[] prc, int itemCnt) {
        this.items = itm;
        this.itemcode = cd;
        this.qty = qnty;
        this.price = prc;
        this.count = itemCnt;
    }
}

我正在尝试将{setSelectedItems()类的数组[Menu]传递给Transaction类。但是，当我加载Transaction类时，没有收到任何值。