ComboBoxDemo.java

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

public class ComboBoxDemo implements ActionListener
{
    private JFrame frame;
	private JComboBox cb;
	private JLabel label;

	public ComboBoxDemo()
	{
		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());

		cb = new JComboBox();
		cb.addItem("Banana"); cb.addItem("Apple"); cb.addItem("Orange");
		cb.addItem("Grape");  cb.addItem("Mango"); cb.addItem("Pineapple");

		cb.addActionListener(this);
		frame.add(cb);

		label = new JLabel("I show the selected item");
		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)
	{   label.setText((String)cb.getSelectedItem());
	}

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