JSpinner custom step value

Question

Use the following code to create a Date Spinner.
        spnDate = new JSpinner ();
        date = new GregorianCalendar ();
        date.setTime ( Calendar.getInstance ().getTime () );
        dateModelDate = new SpinnerDateModel ( date.getTime (), null, null,
                                               Calendar.DAY_OF_MONTH );
        spnDate.setModel ( dateModelDate );
        spnDate.setEditor ( new JSpinner.DateEditor ( spnDate, "dd/MMM/yyyy" ) );I'm wondering is there a way of changing the step value so that i cud add every 3rd day instead adding a day at a time. But i'd like to keep adding months, a month at a time.
Making sense? Any help?

Answer 1

this might be one way
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.plaf.basic.BasicSpinnerUI;
class Testing extends JFrame
  JSpinner spnDate = new JSpinner ();
  public Testing()
    setLocation(400,300);
    setDefaultCloseOperation(EXIT_ON_CLOSE);
    GregorianCalendar date = new GregorianCalendar ();
    date.setTime ( Calendar.getInstance ().getTime () );
    SpinnerDateModel  dateModelDate = new SpinnerDateModel(
         date.getTime (), null, null,Calendar.DAY_OF_MONTH);
    spnDate.setModel ( dateModelDate );
    spnDate.setEditor ( new JSpinner.DateEditor ( spnDate, "dd/MMM/yyyy" ) );
    getContentPane().add(spnDate);
    pack();
    spnDate.setUI(new MyUI());
  class MyUI extends BasicSpinnerUI
    protected Component createNextButton()
      JButton btnNext = (JButton)super.createNextButton();
      btnNext.addActionListener(new ActionListener(){
        public void actionPerformed(ActionEvent ae){
          GregorianCalendar gc = new GregorianCalendar();
          gc.setTime((Date)spnDate.getValue());
          gc.add(Calendar.DAY_OF_MONTH,2);
          spnDate.setValue(gc.getTime());}});
      return btnNext;
    protected Component createPreviousButton()
      JButton btnPrevious = (JButton)super.createPreviousButton();
      btnPrevious.addActionListener(new ActionListener(){
        public void actionPerformed(ActionEvent ae){
          GregorianCalendar gc = new GregorianCalendar();
          gc.setTime((Date)spnDate.getValue());
          gc.add(Calendar.DAY_OF_MONTH,-2);
          spnDate.setValue(gc.getTime());}});
      return btnPrevious;
  public static void main(String[] args){new Testing().setVisible(true);}
}