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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.

Missing image

What's missing?

There are at least three features that we would need to add to turn this program into asimple but functional web browser.

  • A way for the user to enter the website of interest and to change it at will.
  • A "Back" button.
  • A "Forward" button.

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.

Run the program

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.

What's next?

The next module will introduce sockets for network programming.

Miscellaneous

This section contains a variety of miscellaneous information.

Housekeeping material
  • Module name: Java4655: A Rendering Web Browser
  • File: Java4655.htm
  • Published: 03/02/14
  • Revised: 02/07/16
Disclaimers:

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.

Complete program listing

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

Questions & Answers

what is variations in raman spectra for nanomaterials
Jyoti Reply
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
sciencedirect big data base
Ernesto
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
Daniel
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Source:  OpenStax, Object-oriented programming (oop) with java. OpenStax CNX. Jun 29, 2016 Download for free at https://legacy.cnx.org/content/col11441/1.201
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