Hi Devendra, Here I am giving a sample code against your problem. you can read this complete tutorial from the link given below

http://www.roseindia.net/java/example/java/swing/store-jcombobox-selecteditem-value-msaccess.shtml

import java.awt.*;
import java.awt.event.*;
import java.sql.*;
import javax.swing.*;
public class GetValueOfJcomboBox implements ActionListener{

    String[] petStrings = { "Bird", "Cat", "Dog", "Rabbit", "Pig" };
    String petName ="";

private void createUI()
    {
        JFrame frame = new JFrame("JDBC All in One");
        JComboBox petList = new JComboBox(petStrings);
        petList.setPreferredSize(new Dimension(10,20));
        petList.setSelectedIndex(0);
        petList.addActionListener(this);
        Container cn = frame.getContentPane();
        JPanel p= new JPanel();             
        p.add(petList);
        cn.add(p);
        Insets insets = cn.getInsets();
        Dimension size = p.getPreferredSize();
        p.setBounds(80 + insets.left, 135 + insets.top,
                size.width, size.height);
        cn.setLayout(new BoxLayout(cn,BoxLayout.Y_AXIS));
        frame.add(petList);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.pack();
        frame.setVisible(true);
    }

@Override
public void actionPerformed(ActionEvent e)
{
    JComboBox cb = (JComboBox)e.getSource();
    petName = (String)cb.getSelectedItem();
    for(String s : petStrings)
    {
        if(petName.equals(s))
        {
            addOperation();
            System.out.println("Value added successfully");
        }       
      }
    }

 private void addOperation()
 {
    try
    {
        Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
        Connection con = DriverManager.getConnection("jdbc:odbc:swing");
        String sql = "INSERT INTO PetTable(petName) Values('"+petName+"')";
        Statement st = con.createStatement();
        st.execute(sql);
        JOptionPane.showMessageDialog(null, "Record Added Succesfully.","Record Added",
                JOptionPane.INFORMATION_MESSAGE);
    }
    catch(Exception e)
    {
        JOptionPane.showMessageDialog(null, e.getMessage(),"Error",
                JOptionPane.ERROR_MESSAGE);
    }
  }
 public static void main(String args[])
 {
     GetValueOfJcomboBox gvb = new GetValueOfJcomboBox();
     gvb.createUI();
 }
}// class closed