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

public class JCBExample1			// demo for a JComboBox - simple program, select a String from the JComboBox out of an array
{									// and use the array index of the selected item to select a String from a second array to display
	public static void main(String[] args)			// in a JLabel, this GUI has just the JComboBox and JLabel
	{
		JFrame frame=new JFrame("");
		frame.setSize(350,80);
		JCBPanel p=new JCBPanel();
		frame.add(p);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.setVisible(true);
	}
	
	public static class JCBPanel extends JPanel implements ItemListener
	{
		private JLabel lab;					// to appear on the right hand side in response to the combo box selection
		private JComboBox box;				// drop down box
		private String[] list={"Apple", "Banana", "Cherry", "Date", "Fig", "Orange", "Peach"};	// items for the combo box
		private String[] descr={"One every day is good for you",			// items to display in the JLabel
				"Don't slip on that peal",
				"3 of these and you win the jackpot",
				"Lots and lots of sugar",
				"Can I make that into a cookie?",
				"No thanks, I'd rather have juice", "From Georgia?"};
		
		public JCBPanel()			// note:  we could have instantiated list and descr here
		{
			lab=new JLabel("                         ");	// start with an initially blank JLabel
			box=new JComboBox<String>(list);				// instantiate the JComboBox with the array list
			box.addItemListener(this);						// use ItemListener to handle any itemStateChanged events
			setLayout(new BorderLayout());					// create the layout for the JPanel
			add(box,BorderLayout.CENTER);
			add(lab,BorderLayout.EAST);
		}
		public void itemStateChanged(ItemEvent e)	// method is invoked when the JComboBox's selection changes
		{
			lab.setText(descr[box.getSelectedIndex()]);		// obtain the index of the selected item in the JComboBox
		}													// and use the same index to pull out the corresponding String
	}														// from list and put this in the JLabel
}