JComboBox：选择后出现错误的表单

Question

JComboBox 有一些问题，需要选择不同的项目。选择项目时，我希望新的相关表单出现在用户可以为所选项目输入更多信息（仅每个选择的形式）。在我的程序中，出现了错误的表格，或者几个表格出现的顺序错误。例如，如果我运行程序并选择“Smycke”（珠宝，我的部分代码是瑞典语），则在我选择另一个选项之前不会发生任何事情，例如“Aktie”（Stock） - 然后出现“Smycke”表单通过“Aktie”形式。如何让正确的表格出现？

我的部分代码：

public class Program extends JFrame {

    private ArrayList<Valueables> allValueables = new ArrayList<>();

    private JTextArea display;
    private JRadioButton sortName;
    private JRadioButton sortValue;

    private String[] valueables = { "Smycke", "Aktie", "Apparat" };
    private JComboBox<String> box = new JComboBox<String>(valueables);


    Program() {
        super("Sakregister");
        JPanel top = new JPanel();
        top.add(new JLabel("Värdesaker"));
        add(top, BorderLayout.NORTH);

        JPanel left = new JPanel();
        add(left, BorderLayout.WEST);

        JPanel right = new JPanel();
        right.add(new JLabel("Sortering"));
        sortName = new JRadioButton("Namn", true);
        right.add(sortName);
        sortValue = new JRadioButton("Värde");
        right.add(sortValue);
        ButtonGroup groupb = new ButtonGroup();
        groupb.add(sortName);
        groupb.add(sortValue);
        add(right, BorderLayout.EAST);
        right.setLayout(new BoxLayout(right, BoxLayout.Y_AXIS));

        JPanel bottom = new JPanel();
        bottom.add(new JLabel("Nytt:"));

        bottom.add(box);
        box.addActionListener(new BoxLis());
        add(bottom, BorderLayout.SOUTH);

        display = new JTextArea();
        JScrollPane scroll = new JScrollPane(display);
        display.setEditable(false);
        display.setWrapStyleWord(true);
        add(scroll, BorderLayout.CENTER);

        setSize(600, 500);
        setLocationRelativeTo(null);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setVisible(true);
    }

    class BoxLis implements ActionListener {
        public void actionPerformed(ActionEvent ave) {

            if (box.getSelectedIndex() == 0) {
                box.addActionListener(new JewelryLis());
            } else if (box.getSelectedIndex() == 1) {
                box.addActionListener(new StockLis());
            } else if (box.getSelectedIndex() == 2) {
                box.addActionListener(new DeviceLis());
            }
        }
    }

    class JewelryLis implements ActionListener {
        public void actionPerformed(ActionEvent ave) {

            JewelryForm f = new JewelryForm();
            try {
                int svar = JOptionPane.showConfirmDialog(Program.this, f, "Nytt smycke", JOptionPane.OK_CANCEL_OPTION);
                if (svar != JOptionPane.OK_OPTION)
                    return;

                String name = f.getName();
                int stones = f.getStones();
                boolean isGold = f.getGold();

                addJewelry(name, stones, isGold);

            } catch (NumberFormatException e) {
                JOptionPane.showMessageDialog(Program.this, "Fel inmatning!");
            }
        }
    }

    class StockLis implements ActionListener {
        public void actionPerformed(ActionEvent ave) {

            StockForm f = new StockForm();
            try {
                int svar = JOptionPane.showConfirmDialog(Program.this, f, "Ny aktie", JOptionPane.OK_CANCEL_OPTION);
                if (svar != JOptionPane.OK_OPTION)
                    return;

                String name = f.getName();
                int amount = f.getAmount();
                int stockPrice = f.getStockPrice();

                addStock(name, amount, stockPrice);

            } catch (NumberFormatException e) {
                JOptionPane.showMessageDialog(Program.this, "Fel inmatning!");
            }
        }

    }

    class DeviceLis implements ActionListener {
        public void actionPerformed(ActionEvent ave) {

            DeviceForm f = new DeviceForm();
            try {
                int svar = JOptionPane.showConfirmDialog(Program.this, f, "Ny apparat", JOptionPane.OK_CANCEL_OPTION);
                if (svar != JOptionPane.OK_OPTION)
                    return;

                String name = f.getName();
                int purchasePrice = f.getPurchasePrice();
                int wear = f.getWear();

                addDevice(name, purchasePrice, wear);

            } catch (NumberFormatException e) {
                JOptionPane.showMessageDialog(Program.this, "Fel!");
            }
        }

    }

Answer 1

在您的 BoxLis 列表器中，您将 actionlistnere 添加到组合框中，而不是显示适当的表单。

对您的代码进行更改后将解决该问题。

box.addActionListener(new ActionListener() {
        @Override
        public void actionPerformed(ActionEvent e) {
            if (box.getSelectedIndex() == 0) {
                showJewlryForm();
            } else if (box.getSelectedIndex() == 1) {
                showStockForm();
            } else if (box.getSelectedIndex() == 2) {
                showDeviceForm();
            }

        }
    });    

    private void showJewlryForm() {
        JewelryForm f = new JewelryForm();
        try {
            int svar = JOptionPane.showConfirmDialog(Program.this, f, "Nytt smycke", JOptionPane.OK_CANCEL_OPTION);
            if (svar != JOptionPane.OK_OPTION)
                return;

            String name = f.getName();
            int stones = f.getStones();
            boolean isGold = f.getGold();

            addJewelry(name, stones, isGold);

        } catch (NumberFormatException e) {
            JOptionPane.showMessageDialog(Program.this, "Fel inmatning!");
        }
    }

    private void showStockForm() {

        StockForm f = new StockForm();
        try {
            int svar = JOptionPane.showConfirmDialog(Program.this, f, "Ny aktie", JOptionPane.OK_CANCEL_OPTION);
            if (svar != JOptionPane.OK_OPTION)
                return;

            String name = f.getName();
            int amount = f.getAmount();
            int stockPrice = f.getStockPrice();

            addStock(name, amount, stockPrice);

        } catch (NumberFormatException e) {
            JOptionPane.showMessageDialog(Program.this, "Fel inmatning!");
        }

    }

    private void showDeviceForm() {

        DeviceForm f = new DeviceForm();
        try {
            int svar = JOptionPane.showConfirmDialog(Program.this, f, "Ny apparat", JOptionPane.OK_CANCEL_OPTION);
            if (svar != JOptionPane.OK_OPTION)
                return;

            String name = f.getName();
            int purchasePrice = f.getPurchasePrice();
            int wear = f.getWear();

            addDevice(name, purchasePrice, wear);

        } catch (NumberFormatException e) {
            JOptionPane.showMessageDialog(Program.this, "Fel!");
        }

    }