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Index ‹ java-programmer
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- 1
- 2
- On Java and C++On 28 Apr 2006 00:59:19 -0700, "al pacino" <email***@***.com>
wrote, quoted or indirectly quoted someone who said :
>improve your programming skills and what better tool to do that than
>using c++.
You might find the work of W. Edwards Deming interesting. He was the
man who taught the art of quality control to the Japanese.
He argues there is no point in exhorting people to be better. You
have to change the environment so they naturally and without
additional effort produce better results.
C++ allows well made programs but does little to insist on or even
encourage them. The beautiful quality remains a theoretical goal
rarely achieved. It is a bit like an impressive high wire act.
You can see the effect. If you look over C++ code you will see a huge
range of quality. If you look at Java code it is much more uniform.
The artisan in you yearns for the sporadic brilliance, but the manager
prefers the uniformity.
As a programmer you see the effect. In Java, a higher percentage of
trouble is caught at compile time. Once you have the compiler happy,
usually the code works. Because of the null pointer checks, enforced
initialisation and subscript checks, if a program works at all there
is a higher probability it is working correctly than the equivalent
C++ program. That means a poor programmer who writes buggy code has a
bigger safety net with Java to watch over him to catch these errors.
--
Canadian Mind Products, Roedy Green.
http://mindprod.com Java custom programming, consulting and coaching.
- 2
- how to get the content from an URL?Hi people,
I have write some code that outputs the content of an URL in
System.out,
which is really trivial using the following code:
URL url=new URL("http://www.some-url.com");
URLConnection c=url.openConnection();
BufferedReader is=new BufferedReader(new
InputStreamReader(c.getInputStream()));
String line;
while ((line=is.readLine())!=null) {
System.out.println("line: "+line);
}
But, some URLs have javascript code embedded that redirects the page
or refills
it in some way when it's automatically run by the browser. I want to
have the HTML code after executing that javascript code, exactly as
you can get it from your internet browser's "view source-code", not as
I'am getting it by now.
The cuestion is...
there is ANY workaround to this issue? some way to run javascripted
pages from
java? some way to deliver it to a web browser, or something nicer?
thanks to everyone,
hernan rancati, cesare.
- 5
- 6
- Save gif file from the URLHello,
I just want to save on disc a gif file taken from the internet (i.e.
save as logo.gif the image
http://www.google.com/intl/us_ALL/images/logo.gif ). Is it possible
without much effort (I have read about the extra & not free libraries
but I hope there is a simple way to do so (just read bytes and write
bytes - no modification).
Regards. Marko
- 10
- Paint methodI'm still new to Java, so this may be a pretty pathetic question.
Anyway, I have a paint method in an applet that paints something and
then when a certain button is pushed it needs to draw more (rectangles
and strings to be precise). However, the paint method is above, and
the scope of 'g' does not extend into the actionPerformed method. Can
'Graphics g' be declared outside the paint method, and if not is there
a way to make it work, while rewriting as little as possible?
- 10
- VM -> secure Web Memory, Patent 863I'm releasing to Open Source an e-commerce local memory technique that
could reduce web congestion. A web-based operating system might be
possible. I am releasing this application also to Open Source.
To protect bandwidth for this technique, I applied for and received US
Patent 6,636,863 - the claims of this patent will be interesting to the
Open Source community.
Information:
http://209.87.142.42/webmemory/
Background:
* I originally published in June of 2000 on javaboutique
(http://javaboutique:internet.com/articles/shoppingcart/index.html) and
released the code for an e-commerce front end as Open Source.
* The article was mirrored on Linux Today
(http://linuxtoday.com/news/2000070200204OSSW).
* On Oct. 21, 2003, after a lengthy process including a quality review
by a number of patent examiners, I was granted US Patent 6,636,863
based on this work (to read the text, go to
http://patft.uspto.gov/netahtml/srchnum.htm and input the patent
number).
* Web Memory is secure, client-based, user-specific memory, based in
the JAVA VM present in computers, cell phones, Palm Pilots and chips.
It works in dotNET as well. The bandwidth for this technique has been
protected by patent. Is the method useful to the Open Source community?
Lane Friesen
e-mail: lanefriesen (at) hotmail.com
- 14
- open source poker codeHi,
Bit of a long shot I imagine, but has anyone tried to use:
http://sourceforge.net/projects/pokersource/
They promise some sort of java wrapper in the readme, but all I have
found is c code.
I guess there's a chance to use JNI to call the c stuff but I suffer
from a very rare and extreme form of laziness that prevents this (and I
can't understand the code!).
cheers
Andy
- 14
- steganography using javaHi all,
I am actually new to this steganography thing.So I want to know if
there are any built-in methods and classes to handle stego in
Java.Also,I will very much appreciate if any of you have a sample code
or tutorial link.
Thanks all,
Anindya
- 14
- Got my Java console application finishedI finished my Java console application and it works
great in Windows and Linux. The problem right now is testing
it in Mac. I only have an old Mac Performa with OS8, and my Mac isn't reading
it right. Anyone know how to use a Java console program in pre-OSX Macs?
When I double click on the jar file it launches an editor now, does anyone know
how to launch it as a console application? I have the
Java Runtime Engine installed.
I believe want to associate the jar files with the Java Runtime Engine in
OS8...does anyone know how to do that with a Mac?
- 14
- [Java-Printer]My printers are not senn by java appsThis problem apparently has nothing todo with Java applications : I am on
Linux and apparently now any Java apps run do not see my printer list as
handled by CUPS.
Before it worked ; I think it has to do with the JDK installed ?
Any ideas will be wellcome.
Thanks.
- 14
- Seaching word in text file using JAVA.Hello,
I have a problem on seaching word in text file using JAVA.
Below are the sample code i have written for searching word honda,
1990 and imran.I also want to save word honda in static string name
classtring. For first line i use this java code to save word honda in
classtring and its working well. I have a problem to save second line
1990 and imran.
The technique i use is searching until "=" and save word after "=".Can
anyone give the idea and java code.
Thank you...
------------java code ------------------
content = f.readLine();
// find class name
StringTokenizer s = new StringTokenizer (content,"=");
while (s.hasMoreTokens())
{
String string_val = s.nextToken();
if (string_val.trim().equals("classname".trim()))
{
classString=s.nextToken();
}
}
------- data text file -------------
name_car = honda
year = 1990
owner = imran
- 15
- USB support for Java (Win32)Does anybody know any win32 usb library for java that I can use to
communicate with device. Application will communicate with device
using USB in the same way as RS232 - for control and management.
Thanks,
Dimitry
- 15
- 16
- Core Java ( JAVA 2.0), J2EE, XML, Swing,XSL Opening in Chennai 3+YearsHi All,
We are looking Software Engineer for my MNC Client in
chennai.. L&T info, HCL, Virtusa, EDS
Skill: Core Java ( JAVA 2.0), J2EE, XML, Swing,XSL
Exp 3 to 6 Years
Work Location: Chennai
>> SE, TL, PL openings
If you are looking for a good opening Please send the
resume to email***@***.com
Please send me the following information for a faster
Processing
Name:
Contact NO:
Cell:
Landline:
Current company:
Current Location:
Current Salary:
Expected Salary:
Notice Period with Present Employer:
Total IT Experience:
Relevant Experience:
Key Skills:
Domain Worked:
Are you willing to relocate to chennai
Regards
Latha HR Solutions
Chennai
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| Author |
Message |
rdvarmaa
|
 Posted: 2007-2-19 14:31:00 |
Top |
java-programmer, doubtsin java
Helloo
I am a newer one to java. just started to study it. I am getting so
many doubts in the language. I don have any previous knowledge in
progamming.
I would like to know more about JAVA and its applications in the real
world.
Where can I find jobs after studyig it??? From where will I get
practice programs in it???
Thanks in advance
Deepa
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Arne Vajh鴍
|
| Posted: 2007-2-20 1:19:00 |
Top |
java-programmer >> doubtsin java
email***@***.com wrote:
> I am a newer one to java. just started to study it. I am getting so
> many doubts in the language. I don have any previous knowledge in
> progamming.
>
> I would like to know more about JAVA and its applications in the real
> world.
> Where can I find jobs after studyig it??? From where will I get
> practice programs in it???
Java is the most widely used programming language today
en most places of the world.
If you are good at Java then you should not have a problem
finding a job.
Java is used for almost all kinds of applications: J2EE,
desktop, J2ME.
Arne
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mickey
|
| Posted: 2007-2-20 4:47:00 |
Top |
java-programmer >> doubtsin java
On Feb 19, 11:30 am, email***@***.com wrote:
> Helloo
>
> I am a newer one to java. just started to study it. I am getting so
> many doubts in the language. I don have any previous knowledge in
> progamming.
>
> I would like to know more about JAVA and its applications in the real
> world.
> Where can I find jobs after studyig it??? From where will I get
> practice programs in it???
>
> Thanks in advance
>
> Deepa
hi.. im a junior java programmer.. just a jump starter
im again planning to brush up right from beginning ..actually there's
a book by HORTAN ..hotrtan's java ..and khalid mughal(for basic
fundas)......
actually after u start advance part of java its harder to get into the
apllication development part unless u have strong bese for core
concepts ..
me 2 not having a programming foundations and still facing problems
with coding ,logic building etc ...
mailto:email***@***.com
hey ! deepa plzz replty me .......r u from punjab??
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Index ‹ java-programmer |
- Next
- 1
- Is it possible to design Audio CD player by using Java only?Never tried it myself, but have you looked at java media api. i am thinking
if reading file from the cd in a normal way (binary stream) and then
feeding it to media api can do the job....!!!
Good luck anyways :-)
"MiLF" <email***@***.com> wrote in message
news:bdesn5$rki$email***@***.com...
> I am not expecting how fancy the CD player will be, but basic function is
> enough.
>
>
- 2
- recognizing java processesHow would you recognize a java process (as java process) in runtime
from outside the JVM? (win32)
is there a nicer way than monitorizing DLL loads in order to detect
the jvm.dll/javai.dll load?
- 3
- How to compute a regex match against an object's parameter by name?Consider that you want to do a regex match on the contents of an
attribute of that object. Say, for example, the contents of:
SomeObjectInstance.x
All is well unless you don't know ahead of time that "x" is the
attribute that the user will search against. Suppose that the object
can have any attribute name, and even all those possibilities aren't
known at compile time. The user can/will select this attribute, as well
as the regex pattern.
So the trick is how to apply the match against "x" in this case with
only "x" as a string passed to the method?
// this doesn't work!
public boolean isRegexMatch(String p, String m, SomeObject o, String
attribute){
Pattern pat = Pattern.compile(p);
Matcher mat = pat.matcher(o."attribute"); <--- doesn't work, obviously
return (mat.find());
}
The above would be nice, but as expected-it doesn't work.
So the question is, how to make the method functional without knowing
what it will be passed for "attribute"?
TIA!
BogusException
- 4
- I miss my preprocessor!There's one thing I really used the C/C++ preprocessor for, and that is
compile-time control of debugging statements.
in it's simplest form:
----------------------------------------------
// comment out this line to disable debugs
#define DEBUG 1
#ifdef DEBUG
# define dbg(msg) printf(msg)
#else
# define dbg(msg)
#endif
void main(int argc, char argv[][])
{
dbg("Some sorta message\n");
}
----------------------------------------------
This system had evolved to a very powerful mechanism for
enabling/disabling/removing debug statements from my code. The beauty of it
is that debugging code can be removed
entirely from released code, without removing from the source. (I like
leaving it in the source because it provides a sort of ancillary
documentation). The only shortcoming was the lack of variable macro
parameters in C/C++.
The nearest I could come up with in java is:
----------------------------------------------
class xxx
{
private static final boolean DEBUG=true; // set to false to turn
off debugging
void dbg(String msg)
{
if (DEBUG) // this gets optimized out
System.out.print(msg);
}
public static void main( String[] args )
{
if (DEBUG) dbg("Some sorta message\n");
}
} // xxx
----------------------------------------------
While this does seem to work, it relies on the compiler to implicitly
optimize the code out. Not that I don't trust the compiler, but how can I
prove it?
From an aesthetic point of view, the "if (DEBUG)" part seems to clutter up
the source.
And it leaves a stub for dbg() in the code.
My point is, what options are available to reproduce the desired mechanism?
(Don't give me anything from java 1.5/5.0; I can't use it till it is
officially released, and the major ide manufactures endorse it).
regards,
Dar7yl (the 7 is silent)
- 5
- Reading an array of byte with special delimiter....help me!!Hi guys,
i've developed a java application that has in input a txt file with a
standard format
string string string
string double double
string double double
and stores it into an array of byte with a fixed format,
that is
byte(whitespace)byte(whitespace)byte(;)byte(whitespace)byte(whitespace)byte(;)byte(whitespace)byte(whitespace)byte(;)
that mean introducing byte whitespace value and byte ; value to
separate different columns and different rows.
Now i have to develop inverse routine,that has to read the array of
byte and rebuild its original format.
Can you help me with some idea ord code?
I'm inexepert...please help me with clear suggest...
I post you my routine that converts txt file into an array of byte
P.S.In my txt file number of columns and rows change for each file,what
is standard is a firtst headline that is an array of string and others
row with the same format string array of doubles....
[code]public byte[] getBytes(){
byte middlerow=' ';
byte endrow=';';
Vector temp=new Vector(10000000);
int i=0;
String g=null;
Riga r;
Double val[];
while(i<intest.length){
//copio tutto nell'array di byte
byte []bytes = intest[i].getBytes();
// memorizza in byte un elemento del vettore alla volta
for( Byte aByte : bytes ) {
temp.addElement( aByte );
}
temp.addElement( Byte.valueOf( middlerow ) );
i++;
}
temp.addElement(Byte.valueOf(endrow));
System.out.println("Intestazione convertita in byte");
for(int l=0;l<rows.size()-1;l++){
r=(Riga)rows.get(l);
g=r.getgeneid();
temp.addElement(g.getBytes());
temp.addElement(Byte.valueOf(middlerow));
val=r.getvalues();
for(int e=0;e<=val.length-1;e++){
temp.addElement(Byte.valueOf(val[e].byteValue()));
//val[e].byteValue() fa il casting double in byte
temp.addElement(Byte.valueOf(middlerow));
}
temp.addElement(Byte.valueOf(endrow));
}
byte [] b=new byte[temp.size()];
for (int k=0;i<temp.size();i++){
b[k]=(((Byte)temp.elementAt(k)).byteValue());
}
return b;
}[/code]
Thanks for your help...
- 6
- JBoss 3.2.2 security
Hello,
I'm developing EJB based system on JBoss. The system consists of
two parts: the set of EJB's, mainly Entity Beans which are interfaces
to DB and servlet which is used as user interface. As the interface to
entity beans i'm using statefull session bean. Every call from servlet
have to pass throught it.
To authenticate users I'm using DatabaseServerLoginModule. Users are
able to login, but then they try again to execute eny method from
session bean the server throws exception
Authentication exception, principal=null
What am i doing wrong ?? Should I store the users principal or
it is stored in session context ?
Cheers,
--
Marcin Krasowski mkrasowski (at) zagiel (dot) com (dot) pl
To iterate is human, to recurse divine.
L. Peter Deutsch
- 7
- Capture keystrokeHi,
I have a command line java program and I am trying to capture a keypress
from the user to say pause or stop the program. The only way I can get
this to work at the moment is to read in a key but the program waits for
the user to press return. I don't want this. I want to read the keypress
asynchronously without the user hitting return.
Anybody give me some pointers to how to do this?
Thanks in advance
Brian
- 8
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- 9
- Java Applet in Mac FireFox sets multiple DIFFERENT cookiesI've been fighting with this one for a couple days. I'm getting two
(different) cookie headers being set.
Quick Background:
- Using a TurboGears web application.
- Embedding an Applet to assist in file uploads (JUpload).
- Applet uploads the files and sends the data to a secure URL.
- A session ID preserves the user's login information so they don't
get a 403 or have to login again.
- Works totally fine in everything EXCEPT FireFox on a Mac (Safari
works fine, as well as FireFox in Windows)
Using Ethereal to look at the HTTP header, there are two "Cookies"
values being set. The one that I set, and some other random one which
I have NO idea where it is coming from. As follows:
POST /import/upload HTTP/1.1
Cookies: tg-visit=2k842fgj237dfkvh232c32hdh3832
Content-length: 123541
<blah blah blah other headers>
Cookies: tg-visit=743jk82hfg94520fng62j8233jfg826
The first tg-visit value (the session id) is correct. The second one
which is the last header being set, is some other id being set. In
Safari the tg-visit value is the same on both lines and it works fine.
Other browsers properly only sets a single line. Firefox on a Mac
gives me two different values, and I have NO idea why.
Code to follow:
<APPLET CODE="foo.bar.myApplet" ARCHIVE="/static/myApplet.jar"
WIDTH="450" HEIGHT="320">');
<PARAM name="type" value="application/x-java-applet;version=1.4" /
>');
<PARAM name="scriptable" value="true" />
<PARAM name="postURL" value="${postUrl}" />
<PARAM name="redirectURL" value="${redirectUrl}" />
<PARAM name="tgVisitValue" value="tg-visit=${tgVisitValue}" />
</APPLET>
I have also tried to use the MAYSCRIPT attribute, but that doesn't
really help.
Using TurboGears which fills in the ${tgVisitValue} properly (which
works fine).
myApplet.java
this.mycookies = this.getParameter("tgVisitValue",
DEFAULT_COOKIE_STRING);
if (this.mycookies == DEFAULT_COOKIE_STRING) {
try
{
JSObject window = JSObject.getWindow(this );
JSObject document =
(JSObject)window.getMember( "document" );
String cookies =
(String)window.eval("self.document.cookie");
if (cookies.equals("undefined")) // we're IE
cookies = (String)document.getMember("cookie");
// NAOMI
// get all the unexpired cookies
// this.mycookies = (String) document.getMember( "cookie" );
}
catch ( Exception e )
{
this.mycookies = "nocookie=0";
}
}
This grabs the cookie value properly, so I don't think there are any
problems there. The code that does all the HTTP magic is here:
try{
String boundary = "-----------------------------" +
getRandomString();
url = new URL(uploadURL);
// Setting up the connection for upload.
urlConn = url.openConnection();
urlConn.setRequestProperty("Cookie", this.mycookies);
urlConn.setDoInput (true);
urlConn.setDoOutput (true);
urlConn.setUseCaches (false);
urlConn.setRequestProperty("Content-length", ""+totalFilesLength);
urlConn.setRequestProperty("Content-Type",
"multipart/form-data; boundary=" +
boundary.substring(2,
boundary.length()));
String CRLF = "\r\n";
urlConn.connect();
// Retrieve OutputStream For upload (Post).
dOut = new DataOutputStream(urlConn.getOutputStream());
// Actual Uploading part.
StringBuffer sb;
File f;
uploadedLength = 0;
for(int i=0; i < aTotalFiles.length && !stop; i++){
f = aTotalFiles[i];
sb = new StringBuffer();
// Line 1.
sb.append(boundary);sb.append(CRLF);
// Line 2.
sb.append("Content-Disposition: form-data; name=
\"File");sb.append(i);
sb.append("\"; filename=\"");sb.append(f.toString());
sb.append("\"");sb.append(CRLF);
// Line 3 & Empty Line 4.
sb.append("Content-Type: application/octet-stream");
sb.append("Content-Length: " + f.length());
sb.append(CRLF);sb.append(CRLF);
dOut.writeBytes(sb.toString());
uploadFileStream(f,dOut);
dOut.writeBytes(CRLF);
}
// Telling the Server we have Finished.
dOut.writeBytes(boundary);
dOut.writeBytes("--");
dOut.writeBytes(CRLF);
dOut.flush ();
if(!stop) progress.setString("File(s) uploaded. Wait for server
response!");
bInp = new BufferedReader(new
InputStreamReader(urlConn.getInputStream ()));
Any ideas?
- 10
- Problem with table nameHi!
I have a problem to access tables in an Informix Database. Table names
are something like that :
informix.pv_tvvte
When I try a "SELECT informix.pv_tvvte.numero_vente FROM
informix.pv_tvvte WHERE informix.pv_tvvte.numero_vente=#value#", (I use
ibatis and spring) I get a syntax error exception (SQLException "Bad SQL
Grammar").
If I replace dot with "_" in the name, I get a "Table Not Found" Exception.
How could I escape the dot in the tables names ?
TIA
Arnaud
- 11
- Storing and parsing variable length stringsHi folks...
I have an application which needs to store variable-length strings (up
to 24 characters long) that must then be matched according to prefix.
That is, whenever a prefix is given, the application has to be able to
retrieve all stored strings that start with this prefix. Conversely,
the program has to be able to store strings in such a way, so that
prefix-based retrieving is fast and accurate (i.e., all relative
strings are located and retrieved). Doing this linearly is obviously
slow and inefficient.
So, what is the best way of implementing this functionality in J2SE 1.4
or later? Or, if there is no ready (preprogrammed) way of doing it
properly in the standard distribution, are you aware of any open source
implementation (e.g., tree or something similar)?
Thanks,
Dimitris
- 12
- J2ME interview questionshey all,
i am wondering if u ca give me j2me interview questions link or u can
advice me regarding that.
Thanks!
- 13
- java & CGII am a programming student attempting a quoting system (similar to what
geico does) for my job. I've written a program that is executable from
the command prompt that returns the expected values, but I need it to
work with a webpage.
I want the user to be able to input data, the program process it, and
then display the results. I've found code that uses "POST" to get the
data to a program, but how does the program process it and how do I get
it back into another web page? I've searched the web but I'm having
difficulty finding answers.
Thanks in advance to anyone who can help.
- 14
- problems with TCPMONHi,
I'm using axis 1.2-RC3 and eclipse 3.01RC. When i run tcpmon from
command line
>java -cp org.apache.axis.utils.tcpmon
i use the panel for setting me as listener on port 8083 while tomcat is
on port 8080.
The problem is that when the client comunicate with server i dont have
2 SOAP messages but the tcpmon loops infinite on an error message.
I cant post you the output because tcpmon goes in infinite loop and its
impossible to copy text.
However i have set the axis path appropriately and i have added it to
classpath and classpath to path so i can call tcpmon with java org.....
I have also the needed jars (expecially) axis.jar included in axis
server (on tomcat) and imported in eclipse project.
Thank you in advance!
- 15
- One class in several filesHello
Is possible make one class in several files ?
I would like do this for organization reason.
Thanks in advice
GG
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