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Figure 4 shows the initial output from running this program. Note the vertical scroll bar on the right side of the image.
Figure 4 - JFrame output from the program named Java4655a.
There are at least three features that we would need to add to turn this program into asimple but functional web browser.
Adding these features is not particularly difficult, but I will leave it as an exercise for the student to add these features andconvert this program into a functional web browser.
I encourage you to copy the code from Listing 11 , Listing 12 , and Listing 13 . Compile the code and execute it. Experiment with the code,making changes, and observing the results of your changes. Make certain that you can explain why your changes behave as they do.
The next module will introduce sockets for network programming.
This section contains a variety of miscellaneous information.
Financial : Although the Connexions site makes it possible for you to download a PDF file for thismodule at no charge, and also makes it possible for you to purchase a pre-printed version of the PDF file, you should beaware that some of the HTML elements in this module may not translate well into PDF.
I also want you to know that, I receive no financial compensation from the Connexions website even if you purchase the PDF version ofthe module.
In the past, unknown individuals have copied my modules from cnx.org, converted them to Kindle books, and placed them for sale on Amazon.com showing me as the author. Ineither receive compensation for those sales nor do I know who does receive compensation. If you purchase such a book, please beaware that it is a copy of a module that is freely available on cnx.org and that it was made and published withoutmy prior knowledge.
Affiliation : I am a professor of Computer Information Technology at Austin Community College in Austin, TX.
Listing 11 - The program named Java4655c.
/*File Java4655c.java
Copyright 2014, R.G.BaldwinRev 01/07/14
This is a skeleton program that illustrates how to loada web page into a JEditorPane and illustrates how to
identify the three types of hyperlink events:ENTERED
EXITEDACTIVATED
**********************************************************/import javax.swing.*;
import javax.swing.event.*;import javax.swing.text.html.*;
import java.net.*;import java.awt.*;
class Java4655c{public static void main(String[]args){
new Java4655c().runner("http://www.austincc.edu/baldwin");
}//end main//-----------------------------------------------------//void runner(String webSiteLink){
try{//Create a new URL object from the website string
URL website = new URL(webSiteLink);//Instantiate an overall web page handler
new Java4655cHtmlHandler(website);}catch(Exception e){
e.printStackTrace();}//end catch
}//end runner}//end class Java4655c
//=======================================================//class Java4655cHtmlHandler extends JFrame
implements HyperlinkListener{//Constructor
public Java4655cHtmlHandler(URL website) {setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setTitle("Copyright 2014, R.G.Baldwin");try{
if(website != null) {//Create a JEditorPane containing the web page.
JEditorPane html = new JEditorPane(website);html.setEditable(false);//Register a listener to listen for hyperlink
// events.html.addHyperlinkListener(this);
//Display the JEditorPanethis.getContentPane().add(html);
this.setSize(669,669);this.setVisible(true);
}//end if}catch(Exception e){
e.printStackTrace();}//end catch
}//end constructor//-----------------------------------------------------//
//This hyperlink event listener simply displays the// type of event on the command-line screen.
public void hyperlinkUpdate(HyperlinkEvent e) {if (e.getEventType() ==
HyperlinkEvent.EventType.ENTERED){System.out.println("ENTERED");
}else if (e.getEventType() ==HyperlinkEvent.EventType.EXITED){
System.out.println("EXITED");}else if (e.getEventType() ==
HyperlinkEvent.EventType.ACTIVATED){System.out.println("ACTIVATED");
}//end if}//end hyperlinkUpdate method
//------------------------------------------------------//}//end class Java4655cHtmlHandler
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