How to create a custom popup form with multiple text fields in Java?

How to Create a Simple Popup Form with Multiple Text Fields in Java

When implementing a desktop application, it is often necessary to collect user input through a form. While the JOptionPane.showInputDialog method can be used for simple input, it is not suitable for forms with multiple fields. This article provides an alternative solution that allows developers to create custom popup forms with multiple text fields.

To achieve this, developers should utilize the JOptionPane.showConfirmDialog method in conjunction with a custom panel containing the desired form components. The following steps outline the process:

1. Create a Panel: Instantiate a JPanel and set its layout using GridLayout. This will arrange the form components vertically.
2. Add Form Components: Add JComboBox, JTextField, and JLabel components to the panel as needed.
3. Display the Popup: Call JOptionPane.showConfirmDialog with the panel as the primary argument. This will display the custom popup form with the specified components.
4. Handle Result: After the user interacts with the form, the result variable will indicate whether the OK or Cancel button was clicked. Developers can then process the form data accordingly.

The provided code sample demonstrates how to create a custom popup form with a JComboBox and two JTextField components:

import java.awt.EventQueue;
import java.awt.GridLayout;
import javax.swing.*;

/** @see https://stackoverflow.com/a/3002830/230513 */
class JOptionPaneTest {

    private static void display() {
        String[] items = {"One", "Two", "Three", "Four", "Five"};
        JComboBox<String> combo = new JComboBox<>(items);
        JTextField field1 = new JTextField("1234.56");
        JTextField field2 = new JTextField("9876.54");
        JPanel panel = new JPanel(new GridLayout(0, 1));
        panel.add(combo);
        panel.add(new JLabel("Field 1:"));
        panel.add(field1);
        panel.add(new JLabel("Field 2:"));
        panel.add(field2);
        int result = JOptionPane.showConfirmDialog(null, panel, "Test", JOptionPane.OK_CANCEL_OPTION, JOptionPane.PLAIN_MESSAGE);
        if (result == JOptionPane.OK_OPTION) {
            System.out.println(combo.getSelectedItem() + " " + field1.getText() + " " + field2.getText());
        } else {
            System.out.println("Cancelled");
        }
    }

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                display();
            }
        });
    }
}

By leveraging this technique, developers can easily create custom popup forms with multiple fields, providing a more user-friendly and efficient way to collect user input within their Java applications.

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