This example shows you how to create a JSpinner
that allow you to select an hour value. As the spinner model we are using the SpinnerDateModel
and set the calendar field to Calendar.HOUR_OF_DAY
.
To correctly display the hour value on the spinner we also change the formatter of the spinner’s text field using SimpleDateFormatter
class.
package org.kodejava.swing;
import javax.swing.*;
import javax.swing.text.DefaultFormatterFactory;
import javax.swing.text.DateFormatter;
import java.awt.*;
import java.util.Date;
import java.util.Calendar;
import java.text.SimpleDateFormat;
public class JSpinnerHour extends JFrame {
public JSpinnerHour() {
initializeUI();
}
public static void main(String[] args) {
SwingUtilities.invokeLater(
() -> new JSpinnerHour().setVisible(true));
}
private void initializeUI() {
setSize(500, 500);
setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
setLayout(new BorderLayout());
// The following spinner model will have current date as its
// value and using hour of day as the calendar field. The start
// and end comparable has a null values which mean it doesn't
// have minimum or maximum value.
SpinnerDateModel model = new SpinnerDateModel(new Date(), null,
null, Calendar.HOUR_OF_DAY);
JSpinner spinner = new JSpinner(model);
// Reformat the display of our spinner to show only the hour
// and minute information part.
JFormattedTextField textField =
((JSpinner.DefaultEditor) spinner.getEditor()).getTextField();
DefaultFormatterFactory dff =
(DefaultFormatterFactory) textField.getFormatterFactory();
DateFormatter formatter = (DateFormatter) dff.getDefaultFormatter();
formatter.setFormat(new SimpleDateFormat("hh:mm a"));
getContentPane().add(spinner, BorderLayout.NORTH);
}
}