// chap_11\netlinks.java
// program to display a set of buttons on the screen
// to allow for the selection of different sites on the Web

import java.awt.*;
import java.awt.event.*;
import java.applet.*;
import java.net.*;

public class netlinks extends Applet implements ActionListener
{
	// initialize an array with the names of the Web sites
	String[] webSiteNames = {"Oxford Brookes University",
							 	    "Oxford Computing Laboratory",
							 	    "Jones & Bartlett",
							 	    "Java Development",
							 	    "Windows 95 utilities"};
	// initialize an array with the URLs of the Web sites
	String[] webURLs      = {"http://www.brookes.ac.uk",
							 	    "http://www.comlab.ox.ac.uk",
		                      "http://www.jbpub.com",
							 	    "http://java.sun.com",
							 	    "http://www.windows95.com"};
	// array of buttons that will denote the different Web sites	
	Button[] button = new Button[webSiteNames.length];
	
	// override method init to display the group of buttons
	public void init()
	{	
		setLayout(null);
		setBackground(Color.yellow);
		
		for (int index=0; index != webSiteNames.length; index++)
		{
			button[index] = new Button(webSiteNames[index]);
			button[index].setLocation(10,25*index);
			button[index].setSize(200,20);
			button[index].setBackground(Color.cyan);
			button[index].addActionListener(this);
			add(button[index]);
		}
	}

	
	// use an implementation of the actionPerformed method taken
	// from the ActionListener abstract class
	public void actionPerformed(ActionEvent event)
	{
		// find the name of the button that was pressed
		Object source = event.getActionCommand();

		for (int index=0; index != webSiteNames.length; index++)
		{
			// inspect each web site name in the array of Web site names
			if (source.equals(webSiteNames[index]))
			{
				// display the relevant page from the Web site
				try
				{
					URL site = new URL(webURLs[index]);
					getAppletContext().showDocument(site);
				}
				catch (MalformedURLException m){System.exit(1);}
			
				return;
			}
		}
	}
}