code: public void zSetAppropriateTextFieldMinimumWidth() {
          Integer programmerSuppliedWidth = settings.getSizeTextFieldMinimumWidth();
          // Determine the appropriate minimum width for the text field.
          int minimumWidthPixels = CalculateMinimumTimeFieldSize.getFormattedTimeWidthInPixels(
                  settings.getFormatForDisplayTime(), settings.fontValidTime, 0);
          if (programmerSuppliedWidth != null) {
              if (settings.getSizeTextFieldMinimumWidthDefaultOverride()) {
                  minimumWidthPixels = Math.max(programmerSuppliedWidth, minimumWidthPixels);
              } else {
                  minimumWidthPixels = programmerSuppliedWidth;
              }
          }
          // Apply the minimum and preferred width to the text field.
          // Note that we only change the width, not the height.
          Dimension newMinimumSize = timeTextField.getMinimumSize();
          newMinimumSize.width = minimumWidthPixels;
          timeTextField.setMinimumSize(newMinimumSize);
          Dimension newPreferredSize = timeTextField.getPreferredSize();
          newPreferredSize.width = minimumWidthPixels;
          timeTextField.setPreferredSize(newPreferredSize);
          this.validate();
      }
docs: zSetAppropriateTextFieldMinimumWidth, This sets the minimum (and preferred) width of the time
  picker text field. The width will be determined (or calculated) from the current time picker
  settings, as described below.
  
  If the programmer has not supplied a setting for the minimum size, then a default minimum
  size will be calculated from the current display format (which includes the locale
  information), and the font for valid times.
  
  If the programmer has supplied a setting for the text field minimum size, then the programmer
  supplied value will be used instead, unless a default override is allowed. (In this case, the
  default value will only be used if the default setting is larger than the programmer supplied
  setting).
  
  For additional details, see the javadoc for this function:
  TimePickerSettings.setSizeTextFieldMinimumWidthDefaultOverride().