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On other forums, this might get modded down as "Unworthy Self Link". I think you should not have posted it here.
As for the article, a brief skimming leaves me quite confused. I think you need more organization. At what point do you show how to write C-style programs? And why do you think those are different from Java, which is already C-style?
Are you planning to write a big main() block of straight line code? I do not see the advantage of that. Teaching bad coding practices to Java beginners seems like a really inappropriate thing to do.
Don't let my name fool you. That's my job.
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I make an excuse for tempering you (as the other forum members) for advertising my article. It is not because lack of modesty but more because I am very old programmer and still consider all kind of forums as public bulletin boards. The times changed, I see it now. The article is addressed to MPU-programmers, who know classical C and don't want to learn Java. The problem is: simple and cheap Cellular Phone is very userful device for MPU-programmes but its software includes only J2ME. I suggest the way for them to use Cell Phone (not Java) as device communicating with MPU's. I posted my link on Java pages to get professional critics of my sourse-code which to my mind has many interresting solutions. I had no intention to teach Java programmers.
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or even further to my BBS days, cross-posting in inappropriate forums was still a big no-no.
I suppose you may have come from pre-Darpanet days when there were no such things as topics. Maybe while you were dodging dinosaurs you'd post wherever you could as fast as possible, just in case a sabre tooth tiger came along or a mammoth tromped on you.
But, yeah, even the earliest versions of America Online had rules. Somehow you missed those...
Don't let my name fool you. That's my job.
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Here's what I'm using to change out the image content in an iframe,
client really needs to have each image linkable, is it possible to add a url variable and array to make each image on click go to a specific URL?
Tryed a few things with my limited java knowledge and can't seem to make it happen.
Any help/suggestions wickedly appreciated!
Script:
<script type="text/javascript">
<!--
function showImage(imgName) {
var curImage = document.getElementById('screenImg');
var curUrl = document.getElementById('screenUrl');
var thePath = 'img/';
var theSource = thePath + imgName;
var theTarget = 'screenImg'
curImage.src = theSource;
curImage.alt = imgName;
curImage.title = imgName;
curImage.target = imgTarget;
}
//-->
</script>
Html:
<iframe src="img/image1.jpg" width="500" height="200" frameborder="0" marginwidth="0" marginheight="0" scrolling="no" name="screenImg" id="screenImg" class="scframe"></iframe>
<a href="#" onMouseOver="showImage('image1.jpg');">Link 1</a><br />
<a href="#" onMouseOver="showImage('image2.jpg');">Link 2</a><br />
<a href="#" onMouseOver="showImage('image3.jpg');">Link 3</a><br />
<a href="#" onMouseOver="showImage('image4.jpg');">Link 4</a><br />
<div class="ForumMod">modified on Wednesday, January 14, 2009 2:41 PM</div>
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HI,
I am using Javascript for bookmark in my project.Here is the code
function prepBookmarkLink() {
if (window.sidebar && window.opera && window.print) {
var bkmkLink = document.getElementById('bookmarkLink');
// bkmkLink.rel = 'sidebar';
// bkmkLink.href = location.href;
// bkmkLink.title = document.title;
// bkmkLink.setAttribute('href',document.URL);
// bkmkLink.setAttribute('title',document.title);
// bkmkLink.setAttribute('rel','sidebar');
// bkmkLink.click();
}
}
function bookmark(){
var title = document.title;
var url= document.URL;
var ua=navigator.userAgent.toLowerCase();
var isKonq=(ua.indexOf('konqueror')!=-1);
var isSafari=(ua.indexOf('webkit')!=-1);
var isMac=(ua.indexOf('mac')!=-1);
var buttonStr=isMac?'Command/Cmd':'CTRL';
if(window.sidebar){
window.sidebar.addPanel(title,url,"");
}
else if(window.opera && window.print) {
prepBookmarkLink();
// (document.write('<a href ="javascript:bookmark()");">Add Bookmark</a>'));
var elem = document.createElement('a');
elem.setAttribute('href',url);
elem.setAttribute('title',title);
elem.setAttribute('rel','sidebar');
elem.click();
// var a=document.createElement('a');
// a.href=location.href;
//
//
// a.rel='sidebar'; // this makes it work in Opera 7+
// a.click();
//
// a.title=document.title;
// return cont.appendChild(a);
// //
document.write('<a href = "'+url+'" title="'+title+'" rel="sidebar">Bookmark Site</a>');
alert('test');
}
else if(window.external && (!document.createTextNode ||
(typeof(window.external.AddFavorite)=='unknown'))) {
// IE4/Win generates an error when you
// execute "typeof(window.external.AddFavorite)"
// In IE7 the page must be from a web server, not directly from a local
// file system, otherwise, you will get a permission denied error.
window.external.AddFavorite(url, title); // IE/Win
} else if(isKonq) {
alert('You need to press CTRL + B to bookmark our site.');
} else if(window.opera) {
alert("dfsdf");
void(0); // do nothing here (Opera 7+)
//return true;
} else if(window.home || isSafari) { // Firefox, Netscape, Safari, iCab
alert('You need to press '+buttonStr+' + D to bookmark our site.');
} else if(!window.print || isMac) { // IE5/Mac and Safari 1.0
alert('You need to press Command/Cmd + D to bookmark our site.');
} else {
alert('In order to bookmark this site you need to do so manually '+
'through your browser.');
}
}
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1) you don't follow the posting guidelines and the messages formatting rules.
2) this is not Java, it is Javascript, so ask the right forum if you want to get relevant answers about this.
Also, I'm sure google knows plenty of cross-browsers working solutions
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I've got an Object array that holds various types of objects. I'm trying to code up some sort of parameterized class or method that will print the contents of those objects.
This array belongs to the framework, and is populated accordingly before a notification routine is called. For example, if the notification routine is called with a value of 100, I know the array contains Orange objects, if it is called with a value of 200, I know the array contains Apple objects, etc. In the notification routine, I need to call a "print" function that will print the contents of the object regardless of its type.
Here's how I am currently doing it:
case 100:
Orange orange = (Orange) m_objectNames[0].getListObject();
printContents(new Orange(), m_objectNames);
break;
case 200:
Apple Apple = (Apple) m_objectNames[0].getListObject();
printContents(new Apple(), m_objectNames);
break;Is this clear as mud? My print function looks like:
public static <T> int printContents( T t, ObjectName objNames[] )
{
for (int x = 0; x < objNames.length; x++)
t = (T) objNames[x].getListObject();
}The loop runs the correct number of times, but I can't figure out how to access the methods and properties of the T objects.
- DC
"Love people and use things, not love things and use people." - Unknown
"The brick walls are there for a reason...to stop the people who don't want it badly enough." - Randy Pausch
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Hi David, coding java now ?! ^^
well, you're not really facing a Java problem, but more a polymorphism one IMO.
as long as you're handling a T (generic class), you cannot guess which methods to call...
the only thing which can be done is calling a method which is in every classes, by telling T is an interface (or an abstract base class)...
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toxcct wrote: Hi David, coding java now ?! ^^
Yes, and have been for nearly two years now. It's been an enjoyable change.
What I have since found out is that I can use instanceof on the objects in the ObjectName[] array. It correctly reports them as being Apple, Orange, Truck, etc. My print routine now looks like:
public void printContents( ObjectName objectNames[] )
{
if (objectNames[0] instanceof Apple)
...
else if (objectNames[0] instanceof Orange)
...
else if (objectNames[0] instanceof Truck)
...
}
"Love people and use things, not love things and use people." - Unknown
"The brick walls are there for a reason...to stop the people who don't want it badly enough." - Randy Pausch
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hum, yes, I thought of that way, but since reflexion is performance consuming (IIRC), I always prefer using "regular" OOP, not tricky solution, but it's true, you can to this (and explicit cast back to the actual type before calling methods)...
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toxcct wrote: ...I always prefer using "regular" OOP, not tricky solution...
What did you have in mind?
"Love people and use things, not love things and use people." - Unknown
"The brick walls are there for a reason...to stop the people who don't want it badly enough." - Randy Pausch
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class Fruit{}
class Orange extends Fruit {}
class Banana extends Fruit {}
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In reality, that is what I have in place:
class InfoBase
{
}
class MessageBase extends InfoBase
{
String strDate;
String strTime;
}
class RecipientBase extends InfoBase
{
String strName;
}
"Love people and use things, not love things and use people." - Unknown
"The brick walls are there for a reason...to stop the people who don't want it badly enough." - Randy Pausch
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Somewhere at home I have a wicked cool printing function that I tweaked from the original code, taken from an online article. I even got the author to suggest some improvements. Unfortunately, I'm at work and the whole thing is based on reflection.
What you seem to want is to override the toString() method.
By default, your objects will use Object.toString(), which merely prints out a hash code or some such. Not very useful for complex requirements.
Override it in your Fruit InfoBase class to print out whatever it is you want. Then, override it again in the subclasses only if you have special changes that the super class cannot see.
[Edited: just realized Fruit was not your class.]
If you want a one-size fits all solution, however, you'll definitely need reflection. If I remember to look tonight, I'll see if I can find that class.
Don't let my name fool you. That's my job.
modified on Monday, February 9, 2009 9:30 PM
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Hi all.. our project is an IEEE paper.Title of the project is "Application of Software Agent to e-Commerce consumer buying support".Where can i get the source code for this project?at least i need some code snippets for this project.Kindly guide us.
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Hello,
I have downloaded Sun Java SE version and NetBeans but dont know where to run the Hello World program.It seems that I should not use NetBeans before I know the basics of Java programming.
I am a VC++ programmer and aware of object oriented language.
Need Help
Prithaa
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hi,
simply click on the 'file' menu in netbeans and make a new project. Select 'Java' from 'catagory' pane and 'Java Application' from 'project' pane. click next and then finish. File 'main.java' will open itself with the following code in it.
package javaapplication2;
public class Main {
public static void main(String[] args) {
}
}
add the following statement in static main after "// TODO code application logic here".
System.out.println("Hello World!");
NetBeans is a very good IDE. infact not that much like Visual studio but still good enough. I can provide you with some tutorials if you want.
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Hello,
Thanks for your help,
Yes I do want the tutorials.
Pritha
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is Sun's very own.
If you are using NetBeans (or Eclipse or another IDE), then you won't need to worry too much about the installation stuff.
If you want to do things the hard way (as Sun's tutorials assume), then you need to make sure you follow the installation guide carefully. Mainly so the Java binaries are in the system path.
When you do it this way, you will have to understand how the package hierarchy works and where you need to be relative to that when you launch your programs. It's a real PITA, but the experience is very helpful. Good luck.
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C#
private void button_Click(object sender, EventArgs e)
{
SerialPort sp = new SerialPort(SerialPort.GetPortNames()[0], 9600, Parity.None, 8, StopBits.One);
String[] str = SerialPort.GetPortNames();
sp.Open();
sp.DtrEnable = true;
sp.RtsEnable = true;
sp.WriteLine("Hello World!");
sp.Close();
}
Java
Enumeration pList = CommPortIdentifier.getPortIdentifiers();
CommPortIdentifier cpi = (CommPortIdentifier) pList.nextElement();
if (cpi.getPortType() == CommPortIdentifier.PORT_SERIAL && cpi.getName().compareTo("COM1") == 0) {
try {
CommPort port = cpi.open("DarwinSys Printing", 30 * 1000);
try {
OutputStream os = port.getOutputStream();
String str = "Hello World!";
byte[] b = str.getBytes();
os.write(b);
os.flush();
os.close();
} catch (IOException ex) {
}
} catch (PortInUseException ex) {
}
I have a device on the serial port which has a led on it. The LED blinks on the C#'s code. I think the code i have written in java is approximately doing the samething but the LED does not blink.
thanks in advance.
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Hi team,
plz explain this program how to run, i want full source code..
thanks
MANI.G
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I got a kind of weird problem. I have created a Java Desktop Application project in NetBeans. I have created a new java class say A. Class A does not has MAIN in it. It contains just METHODS like insert, delete, update, openConnection, closeConection and others like that. To test the class A, I created the MAIN in it and tried to connect to the database, the database connects successfully and all the methods work aswell.
I created a button on the java application and the method which is called when the button is called is named as button1Pressed. Here is the simple code in the button event.
@Action
public void button1Pressed() {
A a = new A();
a.openConnection();
}
Here is the method in class A
public void openConnection() {
String connectionString = "jdbc:mysql://172.16.11.12:3306/Projector_Manager";
try {
Class.forName("com.mysql.jdbc.Driver");
conn = DriverManager.getConnection(connectionString,"root","1");
insertStatement = conn.prepareStatement("insert into Current_Status values (?,?,?,?,?)");
} catch (SQLException ex) {
System.out.println(ex.getMessage());
} catch (ClassNotFoundException ex) {
System.out.println(ex.getMessage());
}
}
The error on the statement is
Communications link failure<br />
<br />
Last packet sent to the server was 1 ms ago. the error comes after 4-5 minutes and until then the application hangs.
but when I declare MAIN in the class A like
public static void main(String[] args)
{
A a = new A();
a.openConnection();
} and execute the code it connects to the database fine.
I dont know why it connects to the database the single file is executed and not when i run the GUI and press the button and it goes to the same code and does not connect.
I have also pasted the whole code in the button1Pressed but still it does not connects to the database
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Can any some say whether its possible to develop a discussion forum using core java? if so can somebody share info on how to start on with that...
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hi
i need to know how to impliment port adress translation for a simulator program, can anyone help
many thanks
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