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- 4
- Is the design of 'ArrayList' good ?
Occasionally I think that the design of 'ArrayList' is not good.
Because ...
The access modifier of 'E[] elementData' in 'ArrayList'
is 'private'. That is, Java do not allow a programmer
to access 'E[] elementData'.
Therefore, he will write the following statements to
sort 'ArrayList'.
<example>
List<String> strList = new ArrayList<String>();
Collections.sort(strList); // <- #1
</example>
By the way, the source of #1 is as follows.
<Quote>
public static <T extends Comparable<? super T>> void sort(List<T> list) {
Object[] a = list.toArray(); // <- #2
Arrays.sort(a); // <- #3
ListIterator<T> i = list.listIterator();
for (int j=0; j<a.length; j++) { // <- #4
i.next();
i.set((T)a[j]);
}
}
</Quote>
If 'strList' is large array, #3 is merge sort.
Merge sort requires 2 * M when M is the memory
size of 'strList'.
Because the memory size of 'a' in #2 is M,
'Collections.sort' requires 3 * M and has to execute #4.
It seems inefficient. (note that 'strList' is large array)
If the access modifier of 'E[] elementData' is 'protected',
he can sort 'strList' with 2 * M and without #4.
What is your comment ?
Thanks.
- 4
- got packages working/////////command line///////////////
Microsoft Windows 2000 [Version 5.00.2195]
(C) Copyright 1985-2000 Microsoft Corp.
C:\>javac @comp
C:\>java -classpath
.;C:\java\classes\org\w3c\tidy\Tidy.jar;C:\java\classes\
atreides.jtidy.Tid
yTest
C:\>type comp
-d C:\java\classes\
-g
-sourcepath C:\java\sources\
-classpath .;C:\java\classes\;C:\java\classes\org\w3c\tidy\Tidy.jar
C:\java\sources\atreides\jtidy\TidyTest.java
C:\>type C:\java\sources\atreides\jtidy\TidyTest.java
// adapted from source available at:
//
<http://sourceforge.net/docman/display_doc.php?docid=1298&group_id=13153>
package atreides.jtidy;
import java.io.IOException;
import java.net.URL;
import java.io.BufferedInputStream;
import java.io.FileOutputStream;
import java.io.PrintWriter;
import java.io.FileWriter;
import org.w3c.tidy.Tidy;
public class TidyTest implements Runnable {
private String url;
private String outFileName;
private String errOutFileName;
private boolean xmlOut;
public TidyTest(String url, String outFileName, String
errOutFileName,
boolean xmlOut) {
this.url = url;
this.outFileName = outFileName;
this.errOutFileName = errOutFileName;
this.xmlOut = xmlOut;
}//tidyTest
public void run() {
URL u;
BufferedInputStream in;
FileOutputStream out;
Tidy tidy = new Tidy();
tidy.setXmlOut(xmlOut);
try {
tidy.setErrout(new PrintWriter(new
FileWriter(errOutFileName),
true));
u = new URL(url);
in = new BufferedInputStream(u.openStream());
out = new FileOutputStream(outFileName);
tidy.parse(in, out);
}//try
catch ( IOException e ) {
System.out.println( this.toString() + e.toString() );
}//catch
}//run
public static void main( String[] args ) {
String url = "http://www.google.com/";
String output = "output.txt"; //specify path?
String errorLog = "errorLog.txt"; //specify path?
TidyTest t1 = new TidyTest(url,output,errorLog,true);
Thread th1 = new Thread(t1);
th1.start();
}//main
}//TidyTest
C:\>
- 8
- 9
- Speeding up jsp
Hello, I'd like to know about ways to speed up a java application.
We're using jsp java beans on a webserver running Apache/Tomcat 4.1.18.
It's accessing database information through ODBC from a Microsoft SQL Server
version 8.0 database across a network. We're encountering some problems
with one jsp page because I think it's retrieving a large result set from
the database. The query in question selects from a database with over 30000
records. We're using JDBC, and limiting our select to only one database
column.
Any recommendations about speeding up the specific problem with this jsp
page, or any general suggestions on performance improvements would be
welcome.
Mike
- 9
- Question for Java GurusOn Tue, 18 May 2004, email***@***.com wrote:
> I suspect that the difference lies in how fundamental we think
> those concepts are. I think that the classpath environment
> variable is a rather peculiar aspect of the JDK command-line
> tools. I much prefer, say, Eclipse 3.0, where I can choose
> project properties and just check all of the user-defined
> libraries that my project uses and expect everything to work,
> without dealing with questions of whether I can set an
> environment variable in one place or another, or oops I only
> set it in this shell so it doesn't appear in other shells, etc.
> I think it's clearly possible to develop Java software without
> worrying one bit about environment variables. So I question
> why understanding the CLASSPATH environment variable (or
> command-line option, etc) would be a necessary prerequisite to
> learning programming in Java.
This is analogous to java programmers thinking they can code
database applications without understanding the underlying
database. Oh, I'm sorry, the JVM is the only world one needs to
know.
--
Galen Boyer
- 9
- [OT] Java 7 features: PLEASE STOP IT! All of you.This is an OpenPGP/MIME signed message (RFC 2440 and 3156)
Twisted schreef:
> On Aug 2, 8:29 am, Lasse Reichstein Nielsen <email***@***.com> wrote:
> [overly verbose off-topic commentary]
Subject says it all.
H.
--
Hendrik Maryns
http://tcl.sfs.uni-tuebingen.de/~hendrik/
==================
http://aouw.org
Ask smart questions, get good answers:
http://www.catb.org/~esr/faqs/smart-questions.html
- 9
- change money program - newbie questionHi,
I would appreciate any help I can get with this. The program accepts a
range of numbers (dollors) and provides a combination of the least
amount of bills and coins needed to make change for the input. This
program works for most numbers but there is a bug. try 19.99 and you
will see that the change is a penny short. Thanks for your help.
-R
public class MoneyDriver {
public static void main(String[] args) {
if(args.length != 1){
System.out.println("Please suppy only one argument on the command
line");
return;
}
double dblAmount = Double.parseDouble(args[0]);
Money m = new Money();
m.changeMoney(dblAmount);
}
}
public class Money {
Money (){
}
public void changeMoney(double dblAmount){
if((dblAmount < 0.01) || dblAmount > 9999.99){
System.out.println("The number you entered is out of range. Please
enter a number between 0.01 and 9999.99");
return;
}
double [] dblMoneyDenomination = {100.00, 50.00, 20.00, 10.00, 5.00,
1.00, 0.25, 0.10, 0.05, 0.01};
int count = 0;
for(int i = 0; i < dblMoneyDenomination.length; i++){
while((dblAmount > dblMoneyDenomination[i])){
++count;
dblAmount = dblAmount - dblMoneyDenomination[i];
}
if(count != 0){
System.out.println("Change is " + count + " " +
dblMoneyDenomination[i] + " bill(s)");
}
/* if(i + 1 == dblMoneyDenomination.length){
System.out.println("Change is " + ++count + " " +
dblMoneyDenomination[i] + " bill(s)");
}
*/
count = 0;
}
}
}
- 11
- Java Hotspot VM Client 1.4.2.xxxx ???hi,
i've installed JDK 1.4.2, then I installed netbeans 5.0, and have
netbeans use this JDK version (I've uninstalled previous JDK versions
installed on my machine prior to installing 1.4.2). now, netbeans says:
"broken platform 'Java_Hotspot_TM__Client_VM_1.4.2_08-b03'...
From Sun's site, Java Hotspot is included in JDK 1.4.2, but where can
I find the jar file for it (i don't even know the name of the jar
file)?
your help is appreciated.
crash.test.dummy
- 11
- xerces parseri have slight problem:
i downloaded the xerces xml-parser and want to use the DOMParser class:
import org.apache.xerces.parsers.DOMParser;
later in code:
DOMParser parser = new DOMParser();
this class resides in a jar-file which i put in my classpath
(/dir/xalan-j_2_6_0/xercesImpl.jar)
jar -tvf reveals the DOMParser class is there, but the compiler says it
can't resolve the symbol.
Is this because you can't access this class directly anymore?
Should i use JAXP, to access it?
anybody an idea?
tx
- 13
- Error Code / Number ?Hi Group
is there any way to get the Error Code or Number related to the error ?
(Say within catch bolck)
Is java support that type of thing ?
What can i get from hashCode ?
Dishan
- 14
- How to process 1000 request using ThreadI have one problem. What is the optimal approach for handling 1000
request by using thread.there are 2 scenario. 1 create 1000 thread and
execute the program 2. create 10 thread and pool 1000 requests by some
scheduling algorithm.
- 16
- animation in custom table cell rendererDoes anybody know how to make animated gifs work in cell renderer?
I'm trying to use JLabel as base component with animated gif as image.
It works perfectly anywere except JTable...
- 16
- Creating a (META) FAQ for c.l.j.g? (was: Re: New to the group)"S. Balk" <email***@***.com> writes:
> There is no FAQ for this newsgroup, maybe not that bad to have one...
You think so? There is so much good stuff out there that I don't think
a full FAQ is needed. What is maybe needed is some kind of meta FAQ
pointing to the most interesting stuff (the stuff which we always refer
newbies to).
What is the group's opinion about this? I would volunteer to create
such a meta FAQ if there is sufficient demand. It would be based on the
list of resources I post from time to time in response to newbie
questions.
/Thomas
- 16
- Open Source OCR for Java/C++I found a lot of open source ocr projects from the net. But none of
them was usable.
Could anyone recommend an open source OCR programs to me?
For Java or Windows VC++ or Linux G++
Thanks
Jack
- 16
- change jscrollpane bar?hi,
is it possible to change the scrollbar in a jscrollpane? i wanted to
replace it with an image, is this possible? i just want to change it's
look, i've see some skins but not exactly what i wanted, and i'm not
sure how to make my own skin. if it's possible can someone tell me
how, or point me to a place that shows how to create look and feel
skins for java applications?
Thank you.
|
| Author |
Message |
srinu1982
|
 Posted: 2007-3-2 21:56:00 |
Top |
java-programmer, Wanted Online pdf books about java for download
Hai,
Can anyone tell me where can i find pdf books for download on java.....
|
| |
|
| |
|
Mark Jeffcoat
|
| Posted: 2007-3-3 2:38:00 |
Top |
java-programmer >> Wanted Online pdf books about java for download
email***@***.com writes:
> Can anyone tell me where can i find pdf books for download on java.....
Bruce Eckel has made his __Thinking in Java, 2nd Edition_
available online, at
http://mindview.net/Books/DownloadSites
It's an older edition, and doesn't cover the new bits in
Java 1.5, but it's an excellent place to get started.
--
Mark Jeffcoat
Austin, TX
|
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Index ‹ java-programmer |
- Next
- 1
- Netbeans V5......Tomcat just won't start.. Why??My appologies if this is not the correct forum but I am desperate.
I have downloaded Netbeans V5.0 with JDK 1.5.0_05. Tomcat will not start.
It just seems to hang until it times out. If anyone else has had this
problem OR can direct me to a possible solution I would be deeply grateful.
PS Netbeans refuse to answer my emails!!
- 2
- 3
- Can't compile simple Java code1 class DecimalToBinary{
2 public static void main(String[] y){
3 int dec = new Integer(y[0]).intValue();
4 if (dec/32 = 0)
5 System.out.println(0 + (dec % 32) / 16);
6 else System.out.println(1);
}}
When I try to compile the above code I get an error on line 4:
Error: unexpected type
required: variable
found : value
What is wrong??
Mvh
Johs
- 4
- Java Newbie questionHi all, I'm learning Java 2 by myself and find question for help.
I'm testing the System.in.read() method and tried the following program:
import java.io.*;
class ReadBytes {
public static void main(String args[])
throws IOException {
byte data[] = new byte[10];
System.out.println("Enter some characters.");
System.in.read(data);
System.out.print("You entered: ");
for (int i=0; i<data.length; i++) {
System.out.print((char)data[i]);
}
}
}
My question are:
(1) if I just comment out the "throws IOException" in the main, I
just got compilation error! Is the any condition I can tell whether
I have to throw something or not? I remembered in the HelloWOrld
app, I don't have to throw anything.
(2) If I entered more than 10 characters in the above test, I didn't
get overflow error. Why? Actually I'm expected an exception to
be caught.
Thanks in advance.
- 5
- programi would to get the solution for the following program.
Write a complete Java program that does the following:
Prompt the user to type in the hour and minute departure time for an
airline flight.
Prompt the user to type in the hour and minute arrival time for that
flight. (Note: assume that the flight occurs in just one afternoon, leaving
at or after 1:00 and arriving at or before 12:59. Assume also that the user
provides valid input values!)
Calculate the total number of minutes the flight will be in the air.
Display the departure time, the arrival time, and the flight time (in
minutes) of the flight.
--
Message posted via http://www.javakb.com
- 6
- FreeBSD / Eclipse 3.1 / WTP 0.7Hello,
As port of Eclipse 3.1 is already available, I was trying to install Eclips=
e=20
WTP 0.7 to improve my work with JSPs and Servlets. I installed first: GEF,=
=20
EMF, and Java EMF Model Runtime: JEM-SDK-1.1.zip (this is the problem) from=
=20
WTP site, but I have still error saying that there is no such plugin as=20
org.eclipse.jem.util - I checked plugins directory and there is such plugin=
=20
installed, in manage configuration it is shown as disabled - that's probabl=
y=20
mean that this version is incompatible with FreeBSD.
Is there anybody who installed WTP with success on Free, and can share=20
his/her knowledge on this topic? Anybody work on porting JEM and WTP to=20
FreeBSD?
Best Regards,
Lee
_______________________________________________
email***@***.com mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-java
To unsubscribe, send any mail to "email***@***.com"
- 7
- 8
- Java text compressionWhat's the fastest way to compress/decompress text?
We're doing that over really large datasets in our app. We're currently
converting char arrays to byte arrays using our own UTF-8 conversion
code, and then compressing the bytes using java.util.zip. The code is
pretty old.
I don't like this two-step process, and the profiler shows that this is
a bottleneck in our app.
Is anyone aware of any code that compresses chars directly? Perhaps a
third-party library that does it faster?
In our particular situation, decompression speed is a lot more important
than compression speed.
- 9
- Applet downloading from netI have a beginner's question.
If I go to internet, a web page containing a java applet. The applet
class
should be downloaded to my hardware.
Does anybody can tell me where I can find the downloaded applet class
file
and image file related to the applet class?
Thanks in advance,
P.Kaviarasu
email***@***.com
- 10
- 11
- Swing textboxes can't get focus after JFileChooserHi Java guru's,
I have a swing form that has a text field where a directory name can
be entered. Just to its right I have a button that will open the
JFileChooser dialog to allow selection of the directory name from a
dialog.
I can go in and type the directory name into the textbox by hand. So
far, so good.
I can go in and press the button, have the dialog appear, choose a
directory, and have the textbox programatically updated. Again, this
works.
But, if I press the button and choose a directory, I then lose the
ability to use my mouse to access any textboxes on my form. I am able
to use the tab button to move to, and update the textboxes.
I can't then click my mouse on a textbox and be able to enter in data.
Instead, I have to tab to it. The mouse also cannot be used to select
data within a textbox by double clicking or highlighting it. I CAN
hold down the mouse button and scroll right or left and have the
textbox's data shift if the text exceeds the width of the textbox.
But, the textbox appears to be disabled.
Interestingly enough, I AM able to use my mouse to click other BUTTONs
on the page.
So, its just the textboxes that seem affected.
Anyone have a solution or hints?
(btw, I'm using Java 1.4.2.x)
TIA
Here is my button listener:
public void actionPerformed(ActionEvent event)
{
if (event.getSource() == btnRun)
if (areAllFieldsPopulated())
{
lblStatus.setText("Processing");
ExportFunctionalAreas exportFunctionalAreas = new
ExportFunctionalAreas();
exportFunctionalAreas.ExportXml(txtInputFileName.getText(),
txtOutputFileName.getText(), txtElementName.getText());
lblStatus.setText("Finished");
}
else
{
}
else if (event.getSource() == btnSelectFile)
txtInputFileName.setText(FileHandler.OpenFileDialog(txtInputFileName,"Open
Input File","xml","XML files (*.xml)"));
else if (event.getSource() == btnOutputDirectory)
txtOutputFileName.setText(FileHandler.OpenDirectoryDialog(txtOutputFileName));
}
and here is the open directory dialog code:
public static String OpenDirectoryDialog(Component Owner)
{
JFileChooser chooser = new JFileChooser();
chooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
if (JFileChooser.APPROVE_OPTION == chooser.showOpenDialog(Owner))
return chooser.getSelectedFile().getPath();
else
return null;
}
- 12
- Full Casino Source Codes For JUST $9,900We'd like to know if you or your company is interested in buying online
casino software.
We are now selling full casino sourcecodes for crazy cheap price, $9,900.
Yes, it's not $99,000. IT'S JUST $9,900 for full casino sourcecodes
including software, flash, database and everything we have.
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You own the sourcecodes
There are no royalties to pay
You can setup as many casino sites as you want, without additional cost.
You can license the software for additional revenue opportunities
You can modify software, flash and database anytime at your own will.
You can do whatever you want.
No download flash casino software backed by java technology.
Stunning 3d graphics and sound add quality to our casino software.
The casino software includes the popular games like roulette, craps,
blackjack, caribbean poker, paigow, video poker games, slots, multi-line
slots and more.
Also it includes full marketing and management tools for your successful
casino business.
Check our website.
http://www.eplaysoft.com
http://www.megabetcasino.com (demo site)
The winning rate in fun mode play is different from that of real money
mode.
In real money mode, you can control the winning rate of each game.
Temporary user account for testing realmode play can be provided upon
request.
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database and documents is JUST $9,900
Don't think that our software value is just $ 9,900. It's way beyond even
$99,000.
Check our software at the above site.
We are selling just 3 copies for this price on a first-come-first-served
basis to invest in developing different software(not gaming one).
We are selling full sourcecodes including everything(software, flash,
database and documents).
If you want, we can use escrow.com to make the deal safe and ensured to
you. Using escrow.com, you can release money to us after you receive the
source codes and check/verify if your casino works as megabetcasino.com.
We can install casino on your own server for you.
Contact us if you are interested.
We are the developers of the casino software, not sales broker or
reseller.
David.
email***@***.com
Eplaysoft, the gaming software development company.
http://www.eplaysoft.com
- 13
- Any way to turn off array bounds checking? (Matrix multiplication is so slow!)
I am just starting to learn Java J2RE 5.0. I coded the matrix library
below and found that the array accessing is really slow since each
access is checked:
http://f1.pg.briefcase.yahoo.com/bc/agascoig/vwp2?.tok=bccV1CVBYRRfg_eF&.dir=/Guest&.dnm=ComplexDoubleMatrixJava.zip&.src=bc
It appears that with gcj and a -f switch I can turn off the array
bounds checking.
Will a JVM ever be smart enough to know that if the array bound is a
constant variable within a loop, that it can multiply and check the
final array index is within bounds before doing the loop, and then only
have to check once? It seems stupid to me that a general Matrix isn't
included in the Java class libraries. Anybody have a better general
Matrix library in Java?
Also, a newbie observation, that Double (capital D) didn't get passed
as a reference. Why not? This seems dumb to me, as all other objects
seem to get passed by reference.
- 14
- M-I'5.P ersecution - Capital Radi o - Chris T arrant-=-=-=-=-=-=-=-=-=-=-=-=--=-=-=-=-=
-= Capital Radio -. Chris Tarrant -=
-=-=-=-=-=-=-=-=-=-=-=-=--=-=-=-=-=
Capital Radio DJs have been "in on it" from the start.. One of the first
things. I heard in the summer of 1990 was from a Capital DJ who said, "If
he listens to Capital then he can't be all bad". (supportive, you see. We're
not bastards). Much. of what came over the radio in 1990 is now so far away
the precise details. have been obliterated by time. No diary was kept of the
details, and although archives if they. exist may give pointers, the
ambiguity of what broadcasters said would leave that open. to
re-interpretation.
In spring 1994, Chris Tarrant on his Capital morning show made an aside. to
someone else in the studio, about a person he didn't identify.. He said,
"You know this bloke? He says we're trying to kill him. We. should be done
for. attempted manslaughter".
That mirrored something I had said a day or. two before. What Tarrant said
was understood by the staff member in. the studio he was saying it to; they
said, "Oh no, don't say. that" to Tarrant. If any archives exist of the
morning show (probably unlikely) then. it could be found there; what he said
was so out of. context that he would be very hard put to find an explanation.
A couple of days later, someone at the site where I. was working repeated the
remark although. in a different way; they said there had been people in a
computer room when automatic fire. extinguishers went off and those people
were "thinking of suing. for attempted manslaughter".
Finally, this isn't confined to. the established radio stations. In 1990
after I had listened to. a pirate radio station in South London for about
half an hour, there was. an audible phone call in the background, followed
by total silence for a. few moments, then shrieks of laughter. "So what are
we supposed to say now?. Deadly torture? He's going to talk to us now, isn't
he?", which meant that they could. hear what I would say in my room.
5716
- 15
- How to get Cell ID from J2ME location API, on modern phones!Hi all, I wanted to know how to get the Cell ID using the J2ME
location API? I have found so much sites on the net bu they're all
since 2005 or 2003, and none of them contains a clear example (or even
basic idea) how to take the Cell ID. What I've tryed:
set the Criteria power management to low, so it doesn't search for
bluetooth. Everything else I've left as it is (now limits). It stops
the app for 60 secs (that's what I've set) and then it pops exception
- LocationException, which means it can't find info or timeout. I've
tested with longer times - same result. I'm sure the operator supports
it and the phone supports it (N73).
Please give an idea, please!
Thanks in advance...
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