e787. 用JSpinner实现小时选择

  // Create a calendar object and initialize to a particular hour if desired
    Calendar calendar = new GregorianCalendar();
    calendar.set(Calendar.HOUR_OF_DAY, 13); // 1pm

    // Create a date spinner that controls the hours
    SpinnerDateModel dateModel = new SpinnerDateModel(
        calendar.getTime(), null, null, Calendar.HOUR_OF_DAY);
    JSpinner spinner = new JSpinner(dateModel);

    // Get the date formatter
    JFormattedTextField tf =
        ((JSpinner.DefaultEditor)spinner.getEditor()).getTextField();
    DefaultFormatterFactory factory =
        (DefaultFormatterFactory)tf.getFormatterFactory();
    DateFormatter formatter = (DateFormatter)factory.getDefaultFormatter();

    // Change the date format to only show the hours
    formatter.setFormat(new SimpleDateFormat("hh:00 a"));

    // Or use 24 hour mode
    formatter.setFormat(new SimpleDateFormat("HH:00 a"));

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