Question

第一次来这里

我正在尝试第一次使用秋千。单击时我的按钮不起作用。我找不到错误。我有2个按钮，一个是“添加”，一个是“清除”。添加将稍后将文本字段中的文本添加到文件中，而清除将清除所有文本字段。但是搞定没有回应。我没有看到警告消息框“请填写所有字段！”。或“成功添加”

这是我的代码：

public class CustomerList {

    private JFrame frame;
    private JTextField txtCompanyName;
    private JTextField txtSector;
    private JTextField txtCity;
    private JTextField txtAddress;
    private JTextField txtNotes;
    private JButton btnAdd;

    /**
     * Launch the application.
     */
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    CustomerList window = new CustomerList();
                    window.frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    /**
     * Create the application.
     */
    public CustomerList() {
        initialize();
    }

    /**
     * Initialize the contents of the frame.
     */
    private void initialize() {
        frame = new JFrame();
        frame.setBounds(100, 100, 646, 469);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.getContentPane().setLayout(null);

        JLabel lblCompanyName = new JLabel("Company Name");
        lblCompanyName.setBounds(12, 27, 104, 16);
        frame.getContentPane().add(lblCompanyName);

        JLabel lblSector = new JLabel("Sector");
        lblSector.setBounds(12, 56, 56, 16);
        frame.getContentPane().add(lblSector);

        JLabel lblCountry = new JLabel("Country");
        lblCountry.setBounds(12, 85, 56, 16);
        frame.getContentPane().add(lblCountry);

        JLabel lblCity = new JLabel("City");
        lblCity.setBounds(12, 114, 56, 16);
        frame.getContentPane().add(lblCity);

        JLabel lblAddress = new JLabel("Address");
        lblAddress.setBounds(12, 143, 56, 16);
        frame.getContentPane().add(lblAddress);

        JLabel lblNotes = new JLabel("Notes");
        lblNotes.setBounds(12, 251, 56, 16);
        frame.getContentPane().add(lblNotes);

        txtCompanyName = new JTextField();
        txtCompanyName.setBounds(128, 24, 224, 22);
        frame.getContentPane().add(txtCompanyName);
        txtCompanyName.setColumns(10);

        txtSector = new JTextField();
        txtSector.setBounds(128, 53, 224, 22);
        frame.getContentPane().add(txtSector);
        txtSector.setColumns(10);

        JComboBox comboCountry = new JComboBox();
        comboCountry.addItem("Select");
        comboCountry.addItem("Turkey");
        comboCountry.addItem("Afghanistan");
        comboCountry.addItem("Albania");
        comboCountry.addItem("Algeria");
        comboCountry.addItem("Andorra");
        comboCountry.addItem("Angola");
        comboCountry.addItem("Antigua and Barbuda");


        comboCountry.setToolTipText("Country");
        comboCountry.setBounds(128, 82, 224, 22);
        frame.getContentPane().add(comboCountry);

        txtCity = new JTextField();
        txtCity.setBounds(128, 111, 224, 22);
        frame.getContentPane().add(txtCity);
        txtCity.setColumns(10);

        txtAddress = new JTextField();
        txtAddress.setBounds(128, 140, 224, 99);
        frame.getContentPane().add(txtAddress);
        txtAddress.setColumns(10);

        txtNotes = new JTextField();
        txtNotes.setBounds(128, 248, 224, 99);
        frame.getContentPane().add(txtNotes);
        txtNotes.setColumns(10);


        /*
        JButton btnAdd = new JButton("Add");
        */
        btnAdd = new JButton("Add");

        btnAdd.setBounds(388, 23, 97, 25);
        frame.getContentPane().add(btnAdd);


        btnAdd.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {

                if((txtCompanyName.getText().isEmpty())||(txtSector.getText().isEmpty())||(txtCity.getText().isEmpty())||(txtAddress.getText().isEmpty())||(txtNotes.getText().isEmpty())||(comboCountry.getSelectedItem().equals("Select")))
                    JOptionPane.showMessageDialog(null, "Please fill all fields!");
                else        
                JOptionPane.showMessageDialog(null, "Successfully Added");



            }
        });



        JButton btnClear = new JButton("Clear");
        btnClear.setBounds(497, 23, 97, 25);
        frame.getContentPane().add(btnClear);


        btnClear.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                txtCompanyName.setText(null);
                txtSector.setText(null);
                txtCity.setText(null);
                txtAddress.setText(null);
                txtNotes.setText(null);
                comboCountry.setSelectedItem("Select");


            }
        });

        JButton btnClose = new JButton("Close");
        btnClose.setBounds(497, 81, 97, 25);
        frame.getContentPane().add(btnClose);
        btnClose.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                System.exit(0);             

            }
        }); 
    }
}

Answer 1

您的代码对我来说很好用，但是在JOptionPane.showMessageDialog()的parentComponent参数中使用if ((txtCompanyName.getText().isEmpty()) || (txtSector.getText().isEmpty()) || (txtCity.getText().isEmpty()) || (txtAddress.getText().isEmpty()) || (txtNotes.getText().isEmpty()) || (comboCountry.getSelectedItem().equals("Select"))) { JOptionPane.showMessageDialog(frame, "Please fill all fields!"); } else { JOptionPane.showMessageDialog(frame, "Successfully Added"); }可能在不同平台上表现不同。也就是说，也许对话框正在显示，但没有显示在您期望的位置。

既然有父框架，为什么不指定它呢？

func getSubscriptionPricePerMonth() -> String {}

Java swing JButton用法，无响应

1 个答案: