Hi Friend,

Try the following code:

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
class  JComboBoxExample {
    public static void main(String[] args) 
    {
        JFrame f=new JFrame();
        f.setLayout(null);
        JLabel lab1=new JLabel("Qualification:");
        final JComboBox combo1=new JComboBox();
        combo1.addItem("B tech");
        combo1.addItem("MBA");
        combo1.addItem("MCA");
        combo1.addItem("BBA");
        JButton b=new JButton("Get");
        JLabel lab2=new JLabel("Department:");
        final JComboBox combo2=new JComboBox();
        combo2.addItem("Technologies");
        combo2.addItem("Finance");
        combo2.addItem("Marketing");
        combo2.addItem("Computer Science");

        lab1.setBounds(20,20,100,20);
        combo1.setBounds(120,20,150,20);
        lab2.setBounds(20,50,100,20);
        combo2.setBounds(120,50,150,20);
        b.setBounds(120,80,80,20);
        b.addActionListener(new ActionListener(){
         public void actionPerformed(ActionEvent e){
        String value1 = combo1.getSelectedItem().toString();
        String value2 = combo2.getSelectedItem().toString();
        JOptionPane.showMessageDialog(null,"You have selected '"+value1+"' from Combo1 and '"+value2+"' from Combo2");
         }
         });
        f.add(lab1);
        f.add(combo1);
        f.add(lab2);
        f.add(combo2);
        f.add(b);
        f.setVisible(true);
        f.setSize(400,150);
    }
}

Thanks