ComboBoxDemo2.java

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

public class ComboBoxDemo2 implements ActionListener

{ 

    private JFrame frame;

	private JComboBox cb1, cb2, cb3;

	private JLabel label;

		public ComboBoxDemo2()

	{

		frame = new JFrame("A Simple Swing App");

		//frame.setSize(600, 400);

		Toolkit tk = frame.getToolkit();

		Dimension dim = tk.getScreenSize();

		int width = (int)dim.getWidth();

		int height = (int)dim.getHeight();

		frame.setSize(width, height);

		 

		frame.setLayout(new FlowLayout());	

		

		String[] months = {"January", "February", "March", "April", "May", "June", "July", "August", 

		                   "September", "October", "November", "December"};

		cb1 = new JComboBox(); cb2 = new JComboBox(months); cb3 = new JComboBox();

		

		for(int i = 1; i<=31; i++){ cb1.addItem(i); }

		for(int i = 1970; i<2048; i++){ cb3.addItem(i); }	

				

		cb1.addActionListener(this); cb2.addActionListener(this); cb3.addActionListener(this);

		frame.add(cb1); frame.add(cb2); frame.add(cb3);

		

		label = new JLabel("I show the selected Date");

		label.setFont(new Font("Verdana", Font.BOLD, 18));

		label.setForeground(Color.RED);

		frame.add(label);

				

		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

		frame.setVisible(true);

	}

	

	public void actionPerformed(ActionEvent ae)

	{   String message = "";

	    message += (Integer)cb1.getSelectedItem()+", ";

		message += (String)cb2.getSelectedItem()+", ";

		message += (Integer)cb3.getSelectedItem();

		label.setText(message);		 

	}

	

	public static void main(String[] args)

	{   new ComboBoxDemo2();

	}

}