Question

我在Netbeans中创建了2个JFrame（Booking，ConfirmBooking），两个框架都连接到SQL数据库。在Booking类中，用户通过在jtextfield中输入数字来选择显示的表格。如果用户按下下一个按钮。将处理课程预订并打开ConfirmBooking。我想访问在ConfirmBooking的jtextfield中在Booking中输入的变量，以访问用户预订的度假村的名称。

预订类编码，我想访问类中上面设置为public int的ID。

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
    String x = jTextFieldID.getText();
    ID = Integer.valueOf(x);
    String sql = "SELECT RESORT_NAME FROM LouwDataBase.Resorts WHERE ID = "+ ID;  
        try (PreparedStatement pstmt = conn.prepareStatement(sql)) {

                try (ResultSet rs = pstmt.executeQuery()) {
                    if (rs.next()) {
                    String resortName = rs.getString("RESORT_NAME");

                    int n =  JOptionPane.showOptionDialog(null, 
                    "Do you want to make a booking at "+resortName+"?",
                    "Confirm booking?", 
                    JOptionPane.OK_CANCEL_OPTION, 
                    JOptionPane.INFORMATION_MESSAGE, 
                    null, 
                    new String[]{"Yes I do", "No I don't"},"default");


                    if (n == JOptionPane.YES_OPTION) 
                    {
                        ConfirmBooking CB = new ConfirmBooking();
                        dispose();
                        CB.setLocationRelativeTo(null);
                        CB.setVisible(true);

                    } 
                        else if (n == JOptionPane.NO_OPTION) 
                    {              
            }  
        }
    }

} 
catch (SQLException ex) 
{
Logger.getLogger(Booking.class.getName()).log(Level.SEVERE, null, ex);
}

}

ConfirmBooking类代码

    public void SetUp()
    {
        UserList();

        String sql = "SELECT RESORT_NAME, COST_PER_NIGHT_ZAR FROM LouwDataBase.Resorts WHERE ID = "+ ID;  
            try (PreparedStatement pstmt = conn.prepareStatement(sql)) 
            {
                    try (ResultSet rs = pstmt.executeQuery()) 
                    {
                        if (rs.next()) 
                        {
                        String Name1 = rs.getString("RESORT_NAME");
                        double Price = rs.getDouble("COST_PER_NIGHT_ZAR");
                        String Rands = Double.toString(Price);
                        ResortName.setText(Name1);
                        ResortPrice.setText("R "+Rands);
                        }
                    }
            } 
            catch (SQLException ex) 
            {
                Logger.getLogger(Booking.class.getName()).log(Level.SEVERE, null, ex);
            }
    }

Answer 1

你可以修改一下ConfirmBooking类，这样你就可以在类的构造函数中传递该变量

然后你可以这样做：

if (n == JOptionPane.YES_OPTION) {
     ConfirmBooking CB = new ConfirmBooking(ID);
     dispose();
     CB.setLocationRelativeTo(null);
     CB.setVisible(true);
}

您将该ID存储在ConfirmBooking的成员中，并在您需要时在setUp方法中检索该ID！

Answer 2

您可以尝试这样的事情：

ConfirmBooking CB = new ConfirmBooking();
CB.setResortNumber(resortName);

在类之间共享变量

2 个答案: