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Index ‹ java-programmer
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- 2
- Where Does the Code Go?I have a good programming practice question. Just for fun, Ive taken on a
side project that will help a teacher friend of mine work out grades. I
want a GUI interface that will store and retrieve grading info. So Im
hoping someonecan walk me through my class structure. My biggest question
regards whether or not it is good programming practice to have data objects
as members of my GUI class or if it should be done another way? I have my
main class which calls the GUI class. For now in my most basic skeleton, I
have a very simple student class, contains has a grade class. How should
these classes be arranged?
My first thought was have student a member of the GUI class. Say I have a
form with nothing more then two text fields for name and grade, and a
button. When I click the button, I want to store the the textfield data in
the student/grade classes. I can do that fine if student is a member of the
GUI class, but for some reason Im uncomfortable with this design. It seems
the GUI should be design only, no data access code in there. Eventually I
want to add database connection objects to this model for permanent student
data storage and would need to know where those would be called from as
well. So what do you guys think?
Classes:
Main
Gui
Student -> Grade
How to arrange?
Thanks
Rv5
- 2
- Class.forname()Hello ,
I have a necessity to delete a jar file which is in the CLASSPATH.
But JVM locks it after a class.forName() call, even though the class
loaded is NOT in the JAR file I want to delete. ( I cannot remove the
JAR file from the CLASSPATH )
First of all is it possible?
Any help is appreciated
thanks in advance
- 2
- You don't know anything ...Hello John Bailo , You wrote ,
" I know when someone is bilking his customers
for c++ code whose functionality should be written in
OpenCalc macros "
You comment re-proves :
1 _ You don't know anything about
programming for the desktop .
2_ You don't know anything about my customers ,
even thought I've explained them to you
a million times .
- 4
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_______________________________________________
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To unsubscribe, send any mail to "email***@***.com"
- 4
- Problem with focus on JListHi!
I got 2 JLists . I doubleclick an item to display it's details.
This works fine so far, but:
When I select an item in JList1 and in JList2 the Mouselistener doesn't
know from which JList he should get the item.
So I had the idea that when you select an item in JList1 JList2 should
loose all selections.
But I just don't get it done.
any ideas?
- 7
- how to fire JTree child node eventI have a JTree where each node displays a specific view when selected.
I'd like to somehow fire an event to default the app which view to
display when opened.
How do I fire an event for a JTree as if the user clicked on a specific
child node?
- 9
- help adding items to JComboBox on the flyAnyone happen to see what I might be doing wrong. I'm trying to add
items to my
JComboBox on the fly as nodes are added to the tree. It's like this ...
1. User adds tree nodes to a tree.
2. Then user can select on another node elsewhere in the tree which
renders a JComboBox
and the items just added from step 1 are listed in this box.
I have a few problems ...
- after I select my item in the combobox, the combobox stays there. If
I then select on another node, the item in the combobox doesn't get
selected. It doesn't work where I just select an item and it closes up
and that item is selected.
- sometimes I get a null pointer exception in action performed (because
getSelectedIndex() in getCellEditorValue() returns a -1) which seems to
get called while the program execution is still in the
getTreeCellEditorComponent. This confuses me. Why's it returning -1
when there are items in my combobox?
Any help much appreciated.
(I hope I've got my code snippet here w/o any typos, I had to cut it
down)
----
public class TreeEditor extends AbstractCellEditor implements
TreeCellEditor
{
private JComboBox myComboBox;
public TreeEditor() {
myComboBox = new JComboBox();
myComboBox.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae) {
TreePath path = jTree.getSelectionPath();
stopCellEditing();
Integer val = (Integer) getCellEditorValue();
myComboBox.setSelectedItem(val.intValue());
((MyUserObjectInfo)nodeInfo).setName(
myComboBox.getSelectedItem().toString());
node.setUserObject(((MyUserObjectInfo) nodeInfo));
jTree.getModel().valueForPathChanged(path, nodeInfo);
}
});
}
public Object getCellEditorValue() {
return new Integer(myComboBox.getSelectedIndex());
}
public Component getTreeCellEditorComponent(JTree tree,
Object value, boolean isSelected, boolean expanded,
boolean leaf, int row) {
// find the children of this node that were recently added ...
TreeModel tModel = jTree.getModel();
Object root = tModel.getRoot();
DefaultMutableTreeNode carRoot = (DefaultMutableTreeNode)
tModel.getChild(root, 0);
String nodeName = null;
if (myComboBox.getItemCount() > 0) {
myComboBox.removeAllItems();
}
// add children of another node into this combobox.
for (Enumeration e = carRoot.children(); e.hasMoreElements();)
{
DefaultMutableTreeNode carNode =
(DefaultMutableTreeNode)e.nextElement();
Object nodeInfo = carNode.getUserObject();
nodeName = ((MyUserObjectInfo)nodeInfo).getName();
myComboBox.addItem(nodeName);
}
if (myComboBox.getItemCount() > 0) {
myComboBox.setSelectedIndex(0);
}
return myComboBox;
}
}
- 9
- best struts-jsp-servlet development tool?Hello,
We are going to develop a web based application that uses Oracle 9i
database at the beckend. We started with Oracle JDeveloper 10g. It
seems fine but it fails to meet our needs at some points. Can you
recommend another tool for us?
Thanks in advance
- 9
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- 9
- fixing image sizeI realise there have been several posting on this subject already.
However, despite these, I still can't quite work out how to do this.
I need to take the image from a file (.gif .jpg etc), ensure that the
entire image fits on a JPanel of some size, then put this JPanel onto
another Jpanel.
From what I could gather, it looked like I had to extend JPanel and
override paint(). The problem comes when I try to use drawImage().
Here's the code.
//relevent imports
public class Picture extends JPanel
{
private String fileName;
/** Creates a new instance of Picture */
public Picture(String file)
{
fileName=file;
}
public void paint(Graphics g)
{
super.paintComponent(g);
}
}
- 10
- Calling own-constructors inside another constructorHi all,
Inspecting some pieces of code from someone I found things like this:
class A {
private String id = "";
public A() {
super();
}
public A(String id) {
this.id = id;
}
}
class B extends A {
public B() {
this(""); <-------------------- HERE!
}
public B(String id) {
super(id);
}
}
Inside constructor B() it's calling a constructor. Could this cause some collateral or strange problems?
I know it's nonsense because id attribute it's being initialized by default to "", but I'd like to know if
also is a problem.
- 10
- How to prevent the filechooser resolving symblic linksHello everybody
I am using a filechooser object to select files.
JFileChooser _fileChooser = new JFileChooser();
File[] selectedfiles = _fileChooser.getSelectedFiles();
for (int i =0 ; i < selectedfiles.length; i++) {
//path = selectedfiles[i].getCanonicalPath();
path = selectedfiles[i].getPath();
}
The _fileChooser.getSelectedFiles() returns already absolute path
names. So no matter if I call getPath or getCanocialPath I get the
abosolute path names.
But I want to display symbolic links as relative pathnames.
Is there a way to accomplish this?
Any help I will welcome.
Thanks in advance,
Zoran
- 13
- String and Char HelpI have a few questions but first here is my code.
public class CountVowels
{
public static void main(String[] args)
{
int vowel = 0;
int i;
char pos;
String String1 = "Event Handlers is dedicated to making your
event a most memorable one.";
int length = String1.length();
for(i = 0; i < length - 1 ; i++);
{
pos = String1.charAt(i);
if (pos == 'A' || pos == 'a' || pos == 'E' || pos == 'e' ||
pos == 'I' || pos == 'i' || pos == 'O' || pos == 'o' || pos == 'U' ||
pos == 'u') {
vowel += 1;
}
}
System.out.println("There are " + vowel + " vowels in this
String");
}
}
Question one is why does String1.length() return 70 when there are
only 69 chars. Second question is why does this code not count the
vowels in the String.
Thanks in advance
Robert
- 13
- Java will not workI have recently bought a new computer with windows XP and
internet explorer 6. Any page that i try to access that
contains java will not load the java. I have recieved
warnings like ". . .requires a java compatible browser to
run". I have searched the security options and can find
nothing that will help.
Do i have to download anything or change any options
to get java working?
Anon.
- 15
- Release build in EclipseDoes anyone know how to make a lean release build with Eclipse,
binaries without debugging info ?
|
| Author |
Message |
Darko Jovisic
|
 Posted: 2004-2-21 8:33:00 |
Top |
java-programmer, remote database
Hello!
I'm quite new to Java. I'm making an MySQL interface. So my problem is:
Can I connect to a remote mysql database without having any additional
software running on that server ?
Is JDBC part of JVM ?
I know these are silly questions, but you would help me a great deal.
Thank you!
Darko
|
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Ryan Stewart
|
| Posted: 2004-2-21 11:59:00 |
Top |
java-programmer >> remote database
"Darko Jovisic" <email***@***.com> wrote in message
news:c168vh$dor$email***@***.com...
> Hello!
>
> I'm quite new to Java. I'm making an MySQL interface. So my problem is:
>
> Can I connect to a remote mysql database without having any additional
> software running on that server ?
> Is JDBC part of JVM ?
>
> I know these are silly questions, but you would help me a great deal.
>
> Thank you!
>
> Darko
>
>
http://java.sun.com/docs/books/tutorial/
Especially:
http://java.sun.com/docs/books/tutorial/jdbc/index.html
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Alan Liu
|
| Posted: 2004-2-22 0:07:00 |
Top |
java-programmer >> remote database
You can download the mysql JDBC driver. I don't remember where I got it.
Add the MySQL JDBC jar file to your classpath and follow the tutorial below.
"Ryan Stewart" <email***@***.com> wrote in message
news:email***@***.com...
> "Darko Jovisic" <email***@***.com> wrote in message
> news:c168vh$dor$email***@***.com...
> > Hello!
> >
> > I'm quite new to Java. I'm making an MySQL interface. So my problem is:
> >
> > Can I connect to a remote mysql database without having any additional
> > software running on that server ?
> > Is JDBC part of JVM ?
> >
> > I know these are silly questions, but you would help me a great deal.
> >
> > Thank you!
> >
> > Darko
> >
> >
> http://java.sun.com/docs/books/tutorial/
>
> Especially:
> http://java.sun.com/docs/books/tutorial/jdbc/index.html
>
>
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Tales Mein
|
| Posted: 2006-1-24 2:19:00 |
Top |
java-programmer >> remote database
How do I handle the situation where the website and Sql server are at the
remote site, and I sit here in my underpants at home.
I can get to the website, but how do i browe or connect the data from here.
thanks
|
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QWxiZXJ0IFBhc2N1YWw
|
| Posted: 2006-1-24 2:36:00 |
Top |
java-programmer >> remote database
Terminal Service
"Tales Mein" wrote:
> How do I handle the situation where the website and Sql server are at the
> remote site, and I sit here in my underpants at home.
>
> I can get to the website, but how do i browe or connect the data from here.
>
> thanks
>
>
>
|
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Tales Mein
|
| Posted: 2006-1-24 3:35:00 |
Top |
java-programmer >> remote database
well how do i browse the data and set up sql connections thru the remote IDE
"Albert Pascual" <email***@***.com> wrote in message
news:email***@***.com...
> Terminal Service
>
> "Tales Mein" wrote:
>
>> How do I handle the situation where the website and Sql server are at the
>> remote site, and I sit here in my underpants at home.
>>
>> I can get to the website, but how do i browe or connect the data from
>> here.
>>
>> thanks
>>
>>
>>
|
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Raymond
|
| Posted: 2006-1-24 5:30:00 |
Top |
java-programmer >> remote database
You generally get the server name, uid, pwd and connect to it
from Enterprise Manager by registering it. And you may need to
use TCP/IP instead named pipes. Have you tried registering the server
in EM?
"Tales Mein" <email***@***.com> wrote in message
news:email***@***.com...
> How do I handle the situation where the website and Sql server are at the
> remote site, and I sit here in my underpants at home.
>
> I can get to the website, but how do i browe or connect the data from
here.
>
> thanks
>
>
|
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Luca
|
| Posted: 2006-7-8 1:26:00 |
Top |
java-programmer >> remote database
I'have Easy PHP in localhost and i need connect php page (local) to remote
database:
$db_host = "62.149.225.23";
$db_user = "gfo";
$db_password = "gfo";
$db_name = "gfonline";
$db = mysql_connect($db_host, $db_user, $db_password);
The browser show this message:
Warning: mysql_connect(): Can't connect to MySQL server on '62.149.225.23'
(10061) in e:\php\gfonline.it\provaremoto.php on line 7
Bye
Luca
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Alvaro G. Vicario
|
| Posted: 2006-7-8 2:24:00 |
Top |
java-programmer >> remote database
*** Luca escribi?wrote (Fri, 7 Jul 2006 19:26:04 +0200):
> $db_host = "62.149.225.23";
> $db_user = "gfo";
> $db_password = "gfo";
> $db_name = "gfonline";
> $db = mysql_connect($db_host, $db_user, $db_password);
>
> The browser show this message:
>
> Warning: mysql_connect(): Can't connect to MySQL server on '62.149.225.23'
> (10061) in e:\php\gfonline.it\provaremoto.php on line 7
Does mysql_error() provide further info?
--
-+ http://alvaro.es - 羖varo G. Vicario - Burgos, Spain
++ Mi sitio sobre programaci髇 web: http://bits.demogracia.com
+- Mi web de humor con rayos UVA: http://www.demogracia.com
|
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David Haynes
|
| Posted: 2006-7-8 2:31:00 |
Top |
java-programmer >> remote database
Luca wrote:
> I'have Easy PHP in localhost and i need connect php page (local) to remote
> database:
>
> $db_host = "62.149.225.23";
> $db_user = "gfo";
> $db_password = "gfo";
> $db_name = "gfonline";
> $db = mysql_connect($db_host, $db_user, $db_password);
>
> The browser show this message:
>
> Warning: mysql_connect(): Can't connect to MySQL server on '62.149.225.23'
> (10061) in e:\php\gfonline.it\provaremoto.php on line 7
>
> Bye
> Luca
Can you connect using the mysql command line?
If not, check for firewall ports and remote db server running.
-david-
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Jerry Stuckle
|
| Posted: 2006-7-8 3:00:00 |
Top |
java-programmer >> remote database
Luca wrote:
> I'have Easy PHP in localhost and i need connect php page (local) to remote
> database:
>
> $db_host = "62.149.225.23";
> $db_user = "gfo";
> $db_password = "gfo";
> $db_name = "gfonline";
> $db = mysql_connect($db_host, $db_user, $db_password);
>
> The browser show this message:
>
> Warning: mysql_connect(): Can't connect to MySQL server on '62.149.225.23'
> (10061) in e:\php\gfonline.it\provaremoto.php on line 7
>
> Bye
> Luca
>
>
Sounds like the db server isn't listening on the default port, or a
firewall is blocking your access.
--
==================
Remove the "x" from my email address
Jerry Stuckle
JDS Computer Training Corp.
email***@***.com
==================
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Index ‹ java-programmer |
- Next
- 1
- what's wrong? my first simplest java program failed..I created a test.java file in D:\j2sdk1.4.2_04\bin>
and the content:
class
{
public static void main(String[] args)
{
System.out.println("Hello World!");
}
}
then I compile it:
D:\j2sdk1.4.2_04\bin>javac test.java
test.java:1: <identifier> expected
class
^
test.java:8: '{' expected
^
2 errors
D:\j2sdk1.4.2_04\bin>
my book tell me it would work well, what's wrong?
--
Your fault as a Government is My failure as a Citizen.
- 2
- HELP got 'the code of method is exceeding 65535 limit in jaxbi have 50 elements like this:
<xsd:element name="Refer" substitutionGroup="ResultBaseSub" >
<xsd:complexType >
<xsd:complexContent>
<xsd:extension base="ResultBase">
<xsd:attribute name="Text" type="DbRef" />
</xsd:extension>
</xsd:complexContent>
</xsd:complexType>
</xsd:element>
i can divide them to smaller substituion groups, but will it help?
- 3
- Automatically install java plug-inHello,
How can I automatically install (Internet explorer install dialogbox) the
java plugin from my HTML page.
Need sample code, please.
Thanks :)
- 4
- The Smallcap Journal vINSIDE INFO ALERT
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GET IN ON MONDAY NOV 6th:
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The NTSB's update outlined factual information about the crash, but did not conclude what the probable cause of the crash was. The full board will likely vote on a ruling at a later date.
Funeral services were also scheduled over the next several days for firefighters Jess McLean, 27, of Beaumont; Daniel Hoover-Najera, 20, of San Jacinto; Mark Loutzenhiser, 43, of Idyllwild; and Pablo Cerda, 23, of Fountain Valley. A public memorial service for all five men was planned for Sunday.
Oyler was charged with five counts of murder, 11 counts of arson and 10 counts of use of an incendiary device. The charges include seven fires in June, one in July, one in September and two in October.
The National Transportation Safety Board said the wind, coupled with the pilot's inability to turn sharply, forced the aircraft away from its intended path over the East River and into the building.
- 5
- How to approachLuc The Perverse wrote:
...
>
> WAIT!
>
> I think I got it (I'm not meaning to imply that you didn't help) - and I
> didn't look at anything.
>
> Let's say there are NxN squares, and there are x number of moves.
>
> I can make the square x, y be represented as an integer 0..N * N - 1
>
> So I create a 2D array [N*N][x] of longs which will represent the sum of the
> number of unique paths to the given point.
...
You got it. There is an optimization that reduces the memory cost,
but you have a dynamic programming solution to the problem. And you have
the really big savings from exponential to linear increase in time and
memory as the number of moves increases.
> Hey thanks everyone. This is more than just a single problem or some points
> on a practice problem that doesn't matter anyway. I'm learning how to do
> this, and becoming a better programmer - and that is important to me.
> Learning new abstract concepts, and having exciting revelations is actually
> (though sadly) a bit of a rarity for me.
I think, more than ever after seeing this, that you would benefit from
reading a book on algorithm design.
Patricia
- 6
- java assembler pjb[[[ Google probably will join this post to the 2003-01-03 thread of
the same name, your newsreader may be less helpful. ]]]
Kindly offline I was asked to confirm ...
Yes, instructions appear at:
http://groups.google.com/groups?threadm=2695edf1.0301031438.6fb5cd8%40posting.google.com
Yes I can fetch 48,910 bytes from:
http://members.aol.com/plforth/pjb.zip
Yes that .zip contains the compressed folder pjb/.
pjb/README.txt tells us nothing new except that I am
mailto:email***@***.com and we can click thru to pjb/cshlog.txt. In
turn, pjb/cshlog.txt suggests ..
Three steps:
--- 1) a procedure to produce the disassembly
HelloWorldAppJavaAssembler.java:
cd pjb
javac HelloWorldApp.java pjb/JavaAssembler.java
cp -ip HelloWorldApp.class HelloWorldApp.bin
java pjb.JavaAssembler HelloWorldApp
--- 2) A procedure to reassemble the disassembly:
javac HelloWorldAppJavaAssembler.java
rm HelloWorldApp.class
java HelloWorldAppJavaAssembler
--- 3) A comparison to show we have reassembled precisely the same
.class file:
diff HelloWorldApp.bin HelloWorldApp.class
Pat LaVarre
P.S. I ran this example in Mac OS X, with ships with javac installed,
even if you do not install the Developer's Disk. Linux with Java
should work identically. Windows with Java syntax for these is as
shown except `copy /-y` and `del` and `fc /b` for what here appears as
`cp -ip` and `rm` and `diff`.
- 7
- SocketServer accept() fails to work (Linux)Hello,
I have the following problem with my server appllication:
This is typical server implemented in Java, using ServerSocket object,
waiting for client to connenct on ServerSocket.accept()
method. When the client connects (socket is received from accept() method)
it is handled by the server in separate thread.
The server writes the received data to the file and then closes the socket.
The problem:
the server handles about 20 connections daily, receiving about 100kB - 1MB
of data in each connection.
However after a few days the server fails to work,
the server waits on ServerSocket.accept() (as usually), however the clients
fail to connect to the server, but the server does not see
that any client tried to connect to it, it just waits on
ServerSocket.accept().
I'm using jre1.4.2_04 on Linux - Red Hat 9
Is there some bug in java-Linux-socket implementation or in my code ?
Thanks in advance.
This is the result of system netstat (after a few clients failed to connect
to the server):
tcp 78 0 localhost:32323 localhost:2560 CLOSE_WAIT
tcp 78 0 localhost:32323 localhost:2568 CLOSE_WAIT
tcp 78 0 localhost:32323 localhost:2576 CLOSE_WAIT
tcp 78 0 localhost:32323 localhost:2584 CLOSE_WAIT
tcp 78 0 localhost:32323 localhost:2340 CLOSE_WAIT
tcp 78 0 localhost:32323 localhost:2592 CLOSE_WAIT
tcp 78 0 localhost:32323 localhost:2348 CLOSE_WAIT
tcp 78 0 localhost:32323 localhost:2344 CLOSE_WAIT
tcp 78 0 localhost:32323 localhost:2356 CLOSE_WAIT
tcp 78 0 localhost:32323 localhost:2352 CLOSE_WAIT
tcp 78 0 localhost:32323 localhost:2608 CLOSE_WAIT
A snippet of the server source:
private class Server
{
private ServerSocket _serverSckt = null;
private boolean _break = false;
ServerRunnable()
{
_serverSckt= new ServerSocket(32323);
_serverSckt.setSoTimeout(2000);
}
public void exeServer()
{
try {
Socket clientSckt = null;
while (!_break)
{
try {
clientSckt = _serverSckt.accept();
} catch (SocketTimeoutException ex) {
// ok, timeout occured, while loops again
} catch (InterruptedIOException ex) {
final String sMsg = "_serverSckt Interrupred!!!
managed to transfer " + ex.bytesTransferred + " [bytes]";
_LOGGER.error(sMsg, ex);
}
if (clientSckt != null) {
getClientHandler().handleClient(clientSckt); //
handles client in separate thread
// note: clientSckt is closed by client handler
clientSckt = null;
}
}
} catch (IOException e) {
_LOGGER.error(e);
} catch (Throwable thr) {
_LOGGER.fatal(thr);
} finally {
_serverRunning = false;
try {
_serverSckt.close();
} catch (IOException e) {
Assert.catchReport(e);
}
}
}
}
- 8
- From JAVA to EXE without the JRE
"Emil" <email***@***.com> wrote in message
news:email***@***.com...
> I would like to find a software or a way to have all my classes in my
> application as well as the .dll that I have (from C++) installed into
> one executable.
>
> Any suggestions will be appreciated.
>
> Or, can I have the JRE encapsulated somehow, and later unzip in the
> same directory so that the program would run ?
>
> Emil
>
I think a lot of IDE's have the jre with the install package. Try doing a
search of various installers. I think a popular one is InstallAnywhere
(www.zerog.com).
- 9
- javap: fully qualified names for "new" statementsHello,
I'm using javap for my project.
Basically, what I'm interested in are the "new", "newarray" and
"anewarray" statements.
However, javap only outputs things like:
new #10; //class StringBuffer
but does not give me the fully qualified name.
Is there any way I could get to know this information?
Cheers,
Sebastien Marion
- 10
- RMI between Java 1.4 and Java 1.5 problemWhen attempting to RMI between a 1.4 client and a 1.5 server ( with a
1.5 interface, remote object, stubs and skeletons using the -vcompat
rmic flag ), I get the following error:
java.lang.ClassNotFoundException:
java.rmi.server.RemoteObjectInvocation
Handler (no security manager: RMI class loader disabled)
The plot thickens. The 1.4 client will connect to the 1.5 server if I
run the 1.4 client classes in a 1.5 jvm. However, when I run the 1.4
compiled classes in a 1.4 jvm I get no joy.
Any ideas anyone?
The context is this: getting a Java strored procedure in an Oracle
database running a 1.4 jvm to send "trigger" information to a java
1.5 server on a different machine.
BTW, the rmi interface is very simple. One method, no return type and
the only passed parameter is a string.
- 11
- Java Parallel Port Programming with the Java Communications APII've read some messages on here regarding the Java Communications API
and the problems some have had with writing to parallel ports. I also
was puzzled by why I couldn't get this to work and then finally
figured out something that worked for me so am sharing this.
First of all, I am using Linux, downloaded the RXTX software,
downloaded the Sun x86/Solaris drivers for the Comm API (yes you need
this even for Windows/Linux), and installed per the instructions.
There were a few snags but the instructions contain much of what you
need to get past these.
The main problem I had was with properly wiring the cable from the
parallel port to drive my external circuits. You definately need some
sort of buffer chips to provide the interface from/to the parallel
port and your external devices (i.e. motors, LEDs, etc) and of course
power that circuit with an external 5V supply. That wasn't the problem
for me though. I had my data lines from the parallel port connected to
drive the external device...but it wasn't working with the Java
Communications API.
After some more tinkering, the trick was to tie the parallel port
status lines 10 & 11 (Ack and Busy) to low/ground and lines 12, 13, &
15 (paper out, select, & error) to high/5V. This should be done
through the output of a buffer chip though. I also tied lines 18-25 to
low/ground.
With that, the Java Communications API worked like a charm. The OS and
driver software must cleary require that the status input lines be
broadcasting signals that indicate the external device is OK...and by
tying the status lines mentioned to the proper signal levels...it
looks as if the external device is OK (i.e. no errors, not busy, has
paper, etc).
Previously, I had the status lines all tied to ground or had them
floating. After looking at a parallel port spec, I figured out what
the status lines are signalling to the system.
I hope this helps some of you trying to do something similar.
Regards,
Paul
/******************************************************************/
Paul J. Perrone
Assured Technologies, Inc.
Web: www.assuredtech.com
Author of various books on J2EE, Java, XML, and Web
Services: http://www.assuredtech.com/books_page.htm
Recently completed project includes the
"J2EE Developer's Handbook" geared for J2EE v1.4.
/******************************************************************/
- 12
- help with java assignmentWas just hoping someone could shed a bit of light on how to approach
this assignment. It would seem we have to determine the value of a in
order to determine how many times the method m() is called, but there
doesn't seem to be enough information to determine a's value. Any tips
would be greatly appreciated...
Many Thanks
For each of the following snippets of code, give the number of times
method m() is called, with a brief explanation. Assume that a and b are
nonnegative integers.
Snippet A
for (int i = a; i < a*a; ++i) {
m();
}
int i = 0; int j = a;
while (i <= j) {
++i;
m();
--j;
}
Snippet B
For this one, first we define a method m1:
public static void m1(int a) {
for (int i = 0; i <= a*a; ++i) {
m();
}
}
Now the snippet:
m1(a*a);
Snippet C
for (int i = a; i != a + b; i += 2) {
for (int j = a/2; j > 0; --j) {
for (int k = 1; k < a; ++k) {
m();
}
}
}
Snippet D
for (int i = 0; i < a; ++i) {
for (int j = 148; j < i; ++j) {
m();
}
}
- 13
- Eclipse - problem with external tool path name.I am running Eclipse 3.2 with on Windows with WebSphere WSAdmin set up
as an external tool. WSAdmin is basically a bat file that executes a
Java program. It takes a number of parameters one of which can be a
file containing properties.
External tool: C:\IBM\WAS51\DeploymentManager\bin\wsadmin.bat
Working directory ${workspace_loc:/WSAdmin}
Arguments:
-lang jacl
-host localhost -port 8879
-f ${resource_loc} ${resource_loc:/WSAdmin/WAS5.1/propertyFiles/Aquila/
aquila.properties}
The property file name "${resource_loc:/WSAdmin/WAS5.1/propertyFiles/
Aquila/aquila.properties}" gets converted to
"C:homepatrickeclipseWSAdminCVSWSAdminWAS5.1propertyFilesAquilaquila.properties
"
Obviously the back slashes are being escaped. Is there any way I can
prevent this?
I have already tried "${resource_loc:\\WSAdmin\\WAS5.1\\propertyFiles\
\Aquila\\aquila.properties}" without success.
ERROR: file
C:homepatrickeclipseWSAdminCVSWSAdminWAS5.1propertyFilesAquilaquila.properties
does not exist.
- 14
- JApplet Structure ProblemHi,
I can't run this Japplet in a web browser. But the eclipse applet
viewer works...
I guess it's beacause we havn't implemented the methods init, start,
stop and resize.
Can you post some standard example methods?
Should we move the code from the main method in the init method?
Any help will be appreciated...
Thanks alot
Dennis
package mn;
import java.awt.BorderLayout;
import java.awt.Dimension;
import javax.swing.JApplet;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JSlider;
import javax.swing.JTextField;
public class NewJApplet extends javax.swing.JApplet {
private JPanel jPanel2;
private JPanel jPanel1;
private JPanel jPanel3;
private JPanel jPanel7;
private JLabel jLabel1;
private JLabel jLabel4;
private JPanel jPanel5;
private JLabel jLabel5;
private JTextField jTextField2;
private JSlider jSlider2;
private JPanel jPanel10;
private JLabel jLabel3;
private JPanel jPanel9;
private JCheckBox jCheckBox1;
private JPanel jPanel6;
private JPanel jPanel4;
private JSlider jSlider1;
private JLabel jLabel2;
private JButton OK;
private JTextField jTextField1;
private JButton jb1;
private JButton jb2;
{
//Set Look & Feel
try
{
javax.swing.UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
} catch(Exception e) {
e.printStackTrace();
}
}
/**
* Auto-generated main method to display this
* JApplet inside a new JFrame.
*/
public static void main(String[] args) {
JFrame frame = new JFrame();
NewJApplet inst = new NewJApplet();
// inst.setSize(500,500);
frame.getContentPane().add(inst);
//((JComponent)frame.getContentPane()).setPreferredSize(new
java.awt.Dimension(
// 500,
// 500));
// frame.setSize(500,500);
frame.pack();
// ((JComponent)frame.getContentPane()).setPreferredSize(new
java.awt.Dimension(
// 500,
// 500));
// frame.setSize(500,500);
// inst.setSize(500,500);
frame.setVisible(true);
}
public NewJApplet() {
super();
initGUI();
}
private void initGUI() {
try {
BorderLayout thisLayout = new BorderLayout();
getContentPane().setLayout(thisLayout);
//this.setSize(576, 300);
{
jPanel2 = new JPanel();
getContentPane().add(jPanel2, BorderLayout.NORTH);
//jPanel2.setPreferredSize(new java.awt.Dimension(576, 78));
}
{
jPanel1 = new JPanel();
getContentPane().add(jPanel1, BorderLayout.SOUTH);
BorderLayout jPanel1Layout = new BorderLayout();
jPanel1.setLayout(jPanel1Layout);
//jPanel1.setPreferredSize(new java.awt.Dimension(576, 103));
{
jPanel3 = new JPanel();
BorderLayout jPanel3Layout = new BorderLayout();
jPanel3.setLayout(jPanel3Layout);
//jPanel3.setPreferredSize(new java.awt.Dimension(361, 113));
{
jPanel7 = new JPanel();
jPanel7.setPreferredSize(new java.awt.Dimension(600, 35));
{
jLabel2 = new JLabel();
jPanel7.add(jLabel2);
jLabel2.setText("Signal");
jLabel2.setPreferredSize(new java.awt.Dimension(
58,
17));
}
{
jSlider1 = new JSlider();
jPanel7.add(jSlider1);
}
{
jTextField1 = new JTextField();
jPanel7.add(jTextField1);
jTextField1.setText("1000");
}
{
jLabel1 = new JLabel();
jPanel7.add(jLabel1);
jLabel1.setText("Hz");
}
{
jb1 = new JButton();
jPanel7.add(jb1);
jb1.setText("OK");
}
jPanel3.add(jPanel7, BorderLayout.NORTH);
}
{
jPanel10 = new JPanel();
//jPanel10.setPreferredSize(new java.awt.Dimension(
// 339,
// 35));
{
jLabel4 = new JLabel();
jPanel10.add(jLabel4);
jLabel4.setText("Abtastung");
jLabel4.setPreferredSize(new java.awt.Dimension(
58,
17));
}
{
jSlider2 = new JSlider();
jPanel10.add(jSlider2);
}
{
jTextField2 = new JTextField();
jPanel10.add(jTextField2);
jTextField2.setText("1000");
}
{
jLabel5 = new JLabel();
jPanel10.add(jLabel5);
jLabel5.setText("Hz");
}
{
jb1 = new JButton();
jPanel10.add(jb1);
jb1.setText("OK");
}
jPanel3.add(jPanel10, BorderLayout.SOUTH);
}
jPanel1.add(jPanel3, BorderLayout.WEST);
}
{
jPanel4 = new JPanel();
BorderLayout jPanel4Layout = new BorderLayout();
jPanel4.setLayout(jPanel4Layout);
//jPanel4.setPreferredSize(new java.awt.Dimension(186, 68));
{
jPanel6 = new JPanel();
jPanel4.add(jPanel6, BorderLayout.NORTH);
{
jCheckBox1 = new JCheckBox();
jPanel6.add(jCheckBox1);
jCheckBox1.setText("Abtastungspunkte");
}
}
{
jPanel9 = new JPanel();
jPanel4.add(jPanel9, BorderLayout.CENTER);
//jPanel9
// .setPreferredSize(new java.awt.Dimension(202, 53));
{
jLabel3 = new JLabel();
jPanel9.add(jLabel3);
jLabel3.setText("Abtasttheorem ist erf黮lt");
}
{
OK = new JButton();
jPanel9.add(OK);
OK.setText("Reset");
}
}
{
jPanel5 = new JPanel();
jPanel4.add(jPanel5, BorderLayout.WEST);
}
jPanel1.add(jPanel4, BorderLayout.EAST);
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
- 15
- Shootout (startup)
>On Wed, 30 Apr 2008 08:00:38 -0700 (PDT), Isaac Gouy
<email***@***.com> wrote:
>Why don't you go through all...
startup benchmark...
http://shootout.alioth.debian.org/gp4/benchmark.php?test=hello&lang=all
Damn! C & C++ are killing java in this benchmark. Though I discovered
a trick that improves the speed somewhat and saves some face...
With n = 200 (i.e 200 startups in continuous order).
java hello
time: 23.433s
However, just adding the flag -XX:+AggressiveHeap
java -XX:+AggressiveHeap hello
time: 9.914s
that's a huge improvement.
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