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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

how do they get the third part x = (32)5/4
kinnecy Reply
can someone help me with some logarithmic and exponential equations.
Jeffrey Reply
sure. what is your question?
ninjadapaul
20/(×-6^2)
Salomon
okay, so you have 6 raised to the power of 2. what is that part of your answer
ninjadapaul
I don't understand what the A with approx sign and the boxed x mean
ninjadapaul
it think it's written 20/(X-6)^2 so it's 20 divided by X-6 squared
Salomon
I'm not sure why it wrote it the other way
Salomon
I got X =-6
Salomon
ok. so take the square root of both sides, now you have plus or minus the square root of 20= x-6
ninjadapaul
oops. ignore that.
ninjadapaul
so you not have an equal sign anywhere in the original equation?
ninjadapaul
Commplementary angles
Idrissa Reply
hello
Sherica
im all ears I need to learn
Sherica
right! what he said ⤴⤴⤴
Tamia
hii
Uday
what is a good calculator for all algebra; would a Casio fx 260 work with all algebra equations? please name the cheapest, thanks.
Kevin Reply
a perfect square v²+2v+_
Dearan Reply
kkk nice
Abdirahman Reply
algebra 2 Inequalities:If equation 2 = 0 it is an open set?
Kim Reply
or infinite solutions?
Kim
The answer is neither. The function, 2 = 0 cannot exist. Hence, the function is undefined.
Al
y=10×
Embra Reply
if |A| not equal to 0 and order of A is n prove that adj (adj A = |A|
Nancy Reply
rolling four fair dice and getting an even number an all four dice
ramon Reply
Kristine 2*2*2=8
Bridget Reply
Differences Between Laspeyres and Paasche Indices
Emedobi Reply
No. 7x -4y is simplified from 4x + (3y + 3x) -7y
Mary Reply
is it 3×y ?
Joan Reply
J, combine like terms 7x-4y
Bridget Reply
how do you translate this in Algebraic Expressions
linda Reply
Need to simplify the expresin. 3/7 (x+y)-1/7 (x-1)=
Crystal Reply
. After 3 months on a diet, Lisa had lost 12% of her original weight. She lost 21 pounds. What was Lisa's original weight?
Chris Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
China
Cied
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
Porter
many many of nanotubes
Porter
what is the k.e before it land
Yasmin
what is the function of carbon nanotubes?
Cesar
I'm interested in nanotube
Uday
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
AMJAD
preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
AMJAD
what is system testing
AMJAD
what is the application of nanotechnology?
Stotaw
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
Azam
anybody can imagine what will be happen after 100 years from now in nano tech world
Prasenjit
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
Azam
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
Prasenjit
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
Damian
silver nanoparticles could handle the job?
Damian
not now but maybe in future only AgNP maybe any other nanomaterials
Azam
Hello
Uday
I'm interested in Nanotube
Uday
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
Prasenjit
can nanotechnology change the direction of the face of the world
Prasenjit Reply
At high concentrations (>0.01 M), the relation between absorptivity coefficient and absorbance is no longer linear. This is due to the electrostatic interactions between the quantum dots in close proximity. If the concentration of the solution is high, another effect that is seen is the scattering of light from the large number of quantum dots. This assumption only works at low concentrations of the analyte. Presence of stray light.
Ali Reply
the Beer law works very well for dilute solutions but fails for very high concentrations. why?
bamidele Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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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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