CheckBoxDemo.java

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class CheckBoxDemo implements ItemListener
{
private JFrame frame;
	private JCheckBox c1, c2, c3, c4;
	private JLabel label;
	private String message =" ";

	public CheckBoxDemo()
	{
		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());

		c1 = new JCheckBox("Pizza");
		c1.addItemListener(this);
		c1.setFont(new Font("Verdana", Font.BOLD, 18));
		frame.add(c1);

		c2 = new JCheckBox("Burger");
		c2.addItemListener(this);
		c2.setFont(new Font("Verdana", Font.BOLD, 18));
		frame.add(c2);

		c3 = new JCheckBox("Rolls");
		c3.addItemListener(this);
		c3.setFont(new Font("Verdana", Font.BOLD, 18));
		frame.add(c3);

		c4 = new JCheckBox("Beverage");
		c4.addItemListener(this);
		c4.setFont(new Font("Verdana", Font.BOLD, 18));
		frame.add(c4);

		label = new JLabel("I show the selected items");
		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 itemStateChanged(ItemEvent ie)
	{
		if(c1.isSelected())
			message += c1.getText() +" ";
		if(c2.isSelected())
			message += c2.getText() +" ";
		if(c3.isSelected())
			message += c3.getText() +" ";
		if(c4.isSelected())
			message += c4.getText() +" ";
		label.setText(message);

		message = " ";
	}

	public static void main(String[] args)
	{
		new CheckBoxDemo();
	}
}