Need help with Calendar class

Question

I am writing a class that does the following:
Uses JComboBoxes so that the user can select Day, Month, and Year. I have the months set up January through December. When I choose a month, I wrote a subclass that gets the chosen month and enters the correct number of days in the Day ComboBox.
Here is some sample code:
// This code is in the main class
monthList.addActionListener(new SelectedMonth());
// This code is in the SelectedMonth subclass
selected = monthList.getSelectedIndex();
switch(selected) {
case 0: // for January
dayList.removeAllItems();
g.set(Calendar.MONTH, selected);
max = g.getActualMaximum(Calendar.DAY_OF_MONTH);
for(int i = 1; i <= max; i++) {
dayList.addItem(new Integer(i));
This code is repeated for Cases 1 through 11 to cover the other months.
After Day, Month, and Year are selected, I click an OK button and then want to send the chosen Day, Month, and Year to a database. So, I have another subclass which uses ActionListener and gets the data from the Month, Day, and Year ComboBoxes.
However, I get runtime errors when retrieving the chosen Day using the following command:
String fromDay = (String)dayList.getSelectedItem();
Because the Days were put put into the Day JComboBox in a subclass, this doesn't want to work.
Does anybody have a solution? Any help would be greatly appreciated.
If you would like to look at all of my code, leave your e-mail address and I'll let you have a look.

Answer 1

Hi,
i got solution for ur problem, here u copy the following code and paste in some editor and try to run to see the results.
import java.io.*;
import java.awt.*;
import java.util.Calendar;
import java.awt.event.*;
import javax.swing.*;
public class CalExample extends JFrame
     private String months[]={"Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec"};
     private     JComboBox monthList=new JComboBox(months);
     private     JComboBox dayList=new JComboBox();
     private JButton button=new JButton();
     private int selectedMonth=1;
     private int selectedDay=1;
     public static void main(String[] args)
                    CalExample pe=new CalExample();
     public CalExample()
          JPanel panel=new JPanel();
          panel.setBackground(Color.blue);
          panel.setLayout(null);
          // Month Combo Box related init Stuff
          monthList.setBounds(100,30,100,20);
          monthList.setBackground(Color.white);
          // Day Combo Box related init Stuff
          dayList.setBounds(220,30,100,20);
          dayList.setBackground(Color.white);
          // Output textbox init stuff
          button.setBounds(340,30,100,20);
          button.setText(" Click Me ");
          panel.add(monthList);
          panel.add(dayList);
          panel.add(button);
          getContentPane().add(panel);
          setSize(500,300);
          setVisible(true);
          // Adding Listeners
          monthList.addActionListener
                    new ActionListener()
                              public void actionPerformed(ActionEvent ae)
                                        selectedMonth=monthList.getSelectedIndex();
                                        showDays(selectedMonth);
          button.addActionListener
                    new ActionListener()
                              public void actionPerformed(ActionEvent ae)
                                        selectedDay=dayList.getSelectedIndex();
                                   JOptionPane.showMessageDialog(null,"You Selected Month : "+(months[selectedMonth])+",--> Day : "+(selectedDay+1));
          addWindowListener(new WindowAdapter()
               public void windowClosing(WindowEvent we)
                    System.out.println( " Exiting ...");
                    System.exit(0);
          fillCurrentDate();
     public void showDays(int selectedMonth)
          Calendar cal=Calendar.getInstance();
          cal.set(Calendar.MONTH,selectedMonth);
          int maxDays=cal.getActualMaximum(Calendar.DAY_OF_MONTH);
          dayList.removeAllItems();
          for(int i=1;i<=maxDays;i++)
               dayList.addItem(String.valueOf(i));
     public void fillCurrentDate()
               Calendar cal=Calendar.getInstance();
               showDays(cal.get (Calendar.DAY_OF_MONTH));
HAPPY CODING...
regards
Bandi
mail : [email protected], [email protected]
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