Question about typecast to more generic Class
I have controls refnum and pages refnum and I want to know which way is better:
1) let LabVIEW doing the job
or 2) use "typecast to more generic Class".
In both case the VI works properly.
Thanks
Jean-Marc
Jean-Marc
LV2009 and LV2013
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Thanks for your reply Ben.
I need the controls refnum in the visible part of the pane (for the translation english to french and french to english ).
Jean-Marc
Jean-Marc
LV2009 and LV2013
Free PDF Report with iTextSharp
Attachments:
Translation LV86.zip 235 KB
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Design question about when to use inner classes for models
This is a general design question about when to use inner classes or separate classes when dealing with table models and such. Typically I'd want to have everything related to a table within one classes, but looking at some tutorials that teach how to add a button to a table I'm finding that you have to implement quite a sophisticated tablemodel which, if nothing else, is somewhat unweildy to put as an inner class.
The tutorial I'm following in particular is this one:
http://www.devx.com/getHelpOn/10MinuteSolution/20425
I was just wondering if somebody can give me their personal opinion as to when they would place that abstracttablemodel into a separate class and when they would just have it as an inner class. I guess re-usability is one consideration, but just wanted to get some good design suggestions.It's funny that you mention that because I was comparing how the example I linked to above creates a usable button in the table and how you implemented it in another thread where you used a ButtonColumn object. I was trying to compare both implementations, but being a newbie at this, they seemed entirely different from each other. The way I understand it with the example above is that it creates a TableRenderer which should be able to render any component object, then it sets the defaultRenderer to the default and JButton.Class' renderer to that custom renderer. I don't totally understand your design in the thread
http://forum.java.sun.com/thread.jspa?forumID=57&threadID=680674
quite yet, but it's implemented in quite a bit different way. Like I was saying the buttonClass that you created seem to be creating an object of which function I don't quite see. It looks more like a method, but I'm still trying to see how you did it, since it obviously worked.
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Message was edited by:
deadseasquirrels -
A question about a method with generic bounded type parameter
Hello everybody,
Sorry, if I ask a question which seems basic, but
I'm new to generic types. My problem is about a method
with a bounded type parameter. Consider the following
situation:
abstract class A{ }
class B extends A{ }
abstract class C
public abstract <T extends A> T someMethod();
public class Test extends C
public <T extends A> T someMethod()
return new B();
}What I want to do inside the method someMethod in the class Test, is to
return an instance of the class B.
Normally, I'm supposed to be able to do that, because an instance of
B is also an instance of A (because B extends A).
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Test.java:16: incompatible types
found : B
required: T
return new B();
^
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First of all, thank you very much for all the answers. After I posted the comment, I worked on the program
and I understood that in fact, as spoon_ says the only returned value can be null.
I'm agree that I asked you a very strange (and a bit stupid) question. Actually, during recent months,
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interfaces for defining keys and key factories specification, such as KeySpec (interface) and
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protected abstract <T extends KeySpec> T engineGetKeySpec
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in order to not to open a complicated security discussion but just to explain the ambiguous
part for me, that is, the use of T generic parameter.
The abstract class KeyFactorySpi was defined by Sun Microsystem, in order to give to security
providers, the possibility to implement cryptography services and algorithms according to a given
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verify this, by looking the source code of the KeyFactory class.) So here the T parameter is a
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defined by the provider and not Sun.
stefan.schulz wrote:
>
If you define the method to return some bound T that extends A, you cannot
return a B, because T would be declared externally at invocation time.
The definition of T as is does not make sense at all.>
He is absolutely right about that, but the problem is, as I said, here we are
talking about the implementation and not the invocation. The implementation is done
by the provider whereas the invocation is done by Sun in the class KeyFactory.
So there are completely separated.
Therefore I wonder, how a provider can finally impelment this method??
Besides, dannyyates wrote
>
Find whoever wrote the signature and shoot them. Then rewrite their code.
Actually, before you shoot them, ask them what they were trying to achieve that
is different from my first suggestion!
>
As I said, I didn't choose this method header and I'm completely agree
with your suggestion, the following method header will do the job very well
protected abstract KeySpec engineGetKeySpec (Key key, KeySpec key_spec)
throws InvalidKeySpecException and personally I don't see any interest in using a generic bounded parameter T
in this method header definition.
Once agin, thanks a lot for the answers. -
Questions about ABAP Unit (Integrate in class / encapsulate DB access)
Hi,
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Best Regards
Klaus -
What is branding all about, make it more generic a...
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(N95)
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dona wana by a branded phone!!
Any comments welcome
Some things in life are guaranteed, but can you claim on them?The operator's primary tools for trying to "encourage" customer to stick with them are:
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The main reason operators do more than that - branding, customization - is differentiation; they want to promote/advertise their own brand and services over their competition and "generic" services by the device manufacturers or anyone on the Internet.
Those are their tools to get people to sign up for the contracts and their tariffs (to get back the money they already "lost" on customer acquistion, device subsidy, and to make a profit, too.)
They want users to think that the operator brand and services are what people really want, and not the device (device manufacturer's name.
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Message Edited by petrib on 09-Dec-200701:13 PM -
New to Arch(64), with a few questions about Xorg and more
Hello and Happy New Year everyone,
I'm a user that has just recently decided to try and switch to Linux as the main OS for all things that don't concern gaming. I've been using the "server side" of Linux at work for a couple years now, but when it comes to its desktop part I consider myself not fully competent yet. Under recommendation of a friend I decided to give Arch a shot, and I can say that it really suits my philosophy on how an OS should be like.
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Last edited by Akaraxle (2009-01-03 21:25:43)xisal wrote:
Take a look into /etc/hal/fdi/policy/10-keymap.fdi. This works with portuguese layout:
<snip>
The file did not exist, so I created it and changed "pt" to "it". Thanks a bunch, that fixed it!
Try SMPlayer.
Ah, I'd rather not involve Qt. Besides, isn't SMPlayer simply a frontend to Mplayer (who already has GMplayer integrated into it, IIRC)?
Mikko777 wrote:
Why would you want to use 75Hz with lcd display?
Does it make a difference?
On my monitor, from my point of view, it appears to make a difference. It's that simple
azleifel wrote:In gmplayer Preferences -> Audio -> (assuming alsa selected) -> Configure driver and change the mixer channel to something other than PCM, e.g. Master.
For all the three combos, I have "driver default" selected. The other option is "default"; I tried to manually type "Master" into the mixer channel field, but then gmplayer's windows and my Xfce taskbar started blinking, so I knew I had just "crossed streams".
Regarding NVIDIA X Server Settings, running "usr/bin/nvidia-settings --load-config-only" at login is the only way to apply the settings "automatically".
I've slapped that on my ~/.xinitrc before "exec startxfce4". Thanks in advance, going to test it now!
About the refresh and non-decorated windows issues (which *appears* to be solved after I've wiped the xfce-session cache), I've been thinking: could they somehow be related the login manager I've chosen, SLIM?
P.S. New question: is there any way to enable the ALT+num126 for ~ keyboard behaviour I'm used to under M$ environments?
Last edited by Akaraxle (2009-01-03 09:43:02) -
Question about writeObject/readObject and descendants classes
Hello to all,
I have a doubt about how class serialization is done that I'd like to remove.
I wrote a class (called "A") that implements Serializable interface and, according to java documentation, I implemented the methods read/writeObject and all seem work well.
Now I would know if I have to copy and paste the same methods also in classes that are instantiated into my A class or it is not necessary.
This is an example code:
public class A implements Serializable {
private B Bclass;
private void writeObject(ObjectOutputStream out) throws IOException {...}
private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException {...};
public A() {
B = new Bclass(1,2,3);
public class B implements Serializable {
private int a,b,c;
private C Cclass;
public B(int a, int b, int c) {
this.a = a;
this.b = b;
this.c = c;
C = new Cclass(a,b);
public class C implements Serializable {
private int a,b;
public C(int a, int b) {
this.a = a;
this.b = b;
this.c = c;
}Is it necessary add read/writeObject methods also in "B" and "C" classes?
Thank you in advance for your answers.
Kind Regards,
Antonio.Antonio.A wrote:
The only thing that I do is (d)encrypt in a special manner the (In|Out)put object Stream (and all works well).
The problem is not the method's implementation, but if I have to copy and paste read/writeObject also in the classes initialized into the root class of serialized tree.if i understand correctly, you want to serialize some graph of objects, encrypt that, and then write the encrypted data to the actual ObjectOutputStream. so, assuming you always know the root object of your graph, then this special behavior only needs to exist on these root objects. if any object could be the root of the graph, you would need it on every object. of course, then every object would be independently re-encrypted. this seems like behavor which would be better to handle outside of the objects themselves. unless of course you have some wrapper class whose only purpose is to encrypt the actual data.
*If read/writeObject methods are correctly implemented in the root class that I would serialize, Are they automatically used to serialize also other classes that I initialize and save into the DataStruct of my root class?* i would say the documentation on the Serializable interface is pretty clear and concise. -
Question about static context when using classes
hey there.
i'm pretty new to java an here's my problem:
public class kreise {
public static void main (String[] args) {
//creating the circles
create a = new create(1,4,3);
create b = new create(7,2,5);
System.out.println(a);
System.out.println(b);
//diameters...unimportant right now
getDiameter a_ = new getDiameter(a.radius);
getDiameter b_ = new getDiameter(b.radius);
System.out.println(a_);
System.out.println(b_);
//moving the circles
double x = 2;
double y = 9;
double z = 3;
a = create.move();
System.out.println(a);
}creating a circle makes use of the class create which looks like this:
public class create {
public double k1;
public double k2;
public double radius;
public create(double x,double y,double r) {
k1 = x;
k2 = y;
radius = r;
public create move() {
k1 = 1;
k2 = 1;
radius = 3;
return new create (k1,k2,radius);
public String toString() {
return "Koordinaten: "+k1+" / "+k2+". Radius: "+radius;
}now that's all totally fine, but when i try to usw create.move to change the circles coordinates the compiler says that the non-static method move() can't be referenced from a static context. so far i've seen that my main() funktion MUST be static. when declaring the doubles k1, k2, and radius in create() static it works, but then of course when having created the second circle it overwrites the first one.
i pretty much have the feeling this is very much a standard beginner problem, but searching for the topic never really brought up my problem exactly. thanks in advance!You can't access a non-static method from within a static context. So, you have to call move() from outside of the main method. main has to be static because, in short, at least one method has to be static because there haven't been any objects initialized when the program is started. There are more fundamental problems than with just the static context issue.
I'm confused by your code though. You call create.move(), but this would only be possible if move() was static, and from what I see, it's not. Now that's just one part of it. My second issue is that the logic behind the move() method is very messy. You shouldn't return a newly instantiated object, instead it should just change the fields of the current object. Also as a general rule, instance fields should be private; you have them as public, and this would be problematic because anything can access it.
Have you heard of getters and setters? That would be what I recommend.
Now, also, when you are "moving" it, you are basically creating a new circle with completely differently properties; in light of this, I've renamed it change(). Here would be my version of your code:
public class CircleTester {
public static void main (String[] args)
//Bad way to do it, but here's one way around it:
new CircleTester().moveCircle();
private void moveCircle() //really a bad method, but for now, it'll do
Circle a = new Circle(1,4,3);
Circle b = new Circle(7,2,5);
System.out.println(a);
System.out.println(b);
//diameters. Don't need to have a new getDiameter class
double a_ = a.getRadius() * 2; //Instead of doing * 2 each time, you could have a method that just returns the radius * 2
double b_ = b.getRadius() * 2;
System.out.println(a_);
System.out.println(b_);
//move the circle
a.change(2,9,3);
System.out.println(a);
public class Circle {
private double k1;
private double k2;
private double radius;
public Circle(double x,double y,double r)
k1 = x;
k2 = y;
radius = r;
public void change(int x, int y, int r)
k1 = x;
k2 = y;
radius = r;
public String toString()
return "Koordinaten: "+k1+" / "+k2+". Radius: "+radius;
public double getRadius()
return radius;
}On another note, there is already a ellipse class: http://java.sun.com/j2se/1.5.0/docs/api/java/awt/geom/Ellipse2D.html -
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1, close() method
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What does it mean by "associative channels"?
2, read(byte[] b) method
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Any help??
please help
thankswhile(true){
int lim = in.read(bufferArray);
if(lim == -1)break;
buffer.limit(lim);
buffer.flip();
channel.write(buffer);
buffer.clear();
while (true)
int lim = in.read(buffer);//No such method in InputStream
if (lim < 0) break;
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channel.write(buffer);
buffer.compact();
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In my code I am using a byte array, which is backed by the buffer, I don�t believe that when writing to this byte array , the InputStream will try to update the internal accounting system of the buffer, that�s why I have done this manually by setting the limit of the buffer (the number of bytes actually read are set as the limit).
Correct me if I am a wrong thanks for your feedback . -
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hello everybody. i have a question about the non-static inner class. following is a block of codes:
i can declare and have a handle of a non-static inner class, like this : Inner0.HaveValue hv = inn.getHandle( 100 );
but why cannot i create an object of that non-static inner class by calling its constructor? like this : Inner0.HaveValue hv = Inner0.HaveValue( 100 );
is it true that "you can never CREATE an object of a non-static inner class( an object of Inner0.HaveValue ) without an object of the outer class( an object of Inner0 )"??
does the object "hv" in this program belong to the object of its outer class( that is : "inn" )? if "inn" is destroyed by the gc, can "hv" continue to exist?
thanks a lot. I am a foreigner and my english is not very pure. I hope that i have expressed my idea clearly.
// -------------- the codes -------------------
import java.util.*;
public class Inner0 {
// definition of an inner class HaveValue...
private class HaveValue {
private int itsVal;
public int getValue() {
return itsVal;
public HaveValue( int i ) {
itsVal = i;
// create an object of the inner class by calling this function ...
public HaveValue getHandle( int i ) {
return new HaveValue( i );
public static void main( String[] args ) {
Inner0 inn = new Inner0();
Inner0.HaveValue hv = inn.getHandle( 100 );
System.out.println( "i can create an inner class object." );
System.out.println( "i can also get its value : " + hv.getValue() );
return;
// -------------- end of the codes --------------when you want to create an object of a non-static inner class, you have to have a reference of the enclosing class.
You can create an instance of the inner class as:
outer.inner oi = new outer().new inner(); -
hi just got my new apple ipod touch and to download apps it wants to add questions about myself for more sercurity information. i get up to question 3 and it wont let me select a question but it will let me write an answer so i just pressed done and then it says i cant carry on because ive mised out information when it wont let me do a question!
Welcome to the Apple community.
You might try to see if you can change your security questions. Start here, change your country if necessary and go to manage your account > Password and Security.
I'm able to do this, others say they need to input answers to their current security questions in order to make changes, I'm inclined to think its worth a try, you don't have anything to lose.
If that doesn't help you might try contacting Apple through Express Lane (select your country, navigate to iCloud help and enter the serial number of one of your devices) -
Some question about sqlserver2008 sqljdbc4.jar
hi,thank for read.
I have a question about sqljdbc4j.jar's PreparedStatement class.
When i use PreparedStatement to deal a 'like ? ' query , like this sql (select * from(select ROW_NUMBER() Over(order by id) as rownum,* from t_word ) t where 1=1 and name like ?)
then i set the like param for '%param%' or '%param' or '%param' , the program return
different results, why ?
Is there other way to deal this problem？
Thanks again for the reading. And I hope to get your asapHello,
WHERE title LIKE '%param%' will return all name with the word 'param' anywhere in the name; '%param' will return names end with "param";'param%' with return start with "param".
Referece:
LIKE (Transact-SQL)
Regards,
Fanny Liu
Fanny Liu
TechNet Community Support -
Few questions about Calendar / SimpleDateFormat classes
Hi.
I have few questions about Calendar class:
1. How can I get only date representation (without the time)?
after doing:
Calendar cal = Calendar.getInstance();
I tried to clear unecessary fields:
cal.clear(Calendar.SECOND);
cal.clear(Calendar.MINUTE);
cal.clear(Calendar.HOUR_OF_DAY);
But after printing the time, it seems that the HOUR was not cleared:
SimpleDateFormat sdf1 = new SimpleDateFormat("dd/MM/yyyy HH:mm:ss");
System.out.println(sdf1.format(cal.getTime()));
---> 03/11/2004 17:00:00
Am I missing somthing?
2. I want to make sure that two different formats couldn't be compared. i.e., if I'll try to parse one String according to different format -- ParseException will be thrown.
String date = "19/04/2004 13:06:10";
SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy");
Date dateObj = sdf.parse(date);
However, even though that formats are different, no exception is thrown and the return Date is 19/04/2004 00:00:00.
How can I cause to exception to be thrown if formats are not identical?
Thanks in advancedThe Calendar class has a few of what Microsoft would call 'features'. :^)
To clear the time, call:
calendar.set(calendar.get(Calendar.YEAR), calendar.get(Calendar.MONTH), calendar.get(Calendar.DAY), 0, 0, 0);
If you want 'pessimistic' rather than 'optimistic' date parsing, you have two options:
1) Call calendar.setLenient(false);
See if that is strict enough for your needs, otherwise:
2) Write code to ensure a stricter parsing of the string passed in. For example, you could very simply check the length of the string to determine if time data is also present.
When parsing, a string like '02/29/02' would parse to the date '03/01/02'. Setting lenient to false may fix this, but the surest way is to do some testing and then make the parsing more pessimistic where it suits your needs.
- Saish
"My karma ran over your dogma." - Anon -
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Hi, as new to JMF, I would like to ask some generic questions about JMF from this community
Though including RTP stack, JMF is only compatible to old RTP draft, RFC1889. I know that Sun stopped developing/supporting JMF. What is the alternative solution for JAVA RTP implementation suitable for a serious SERVER project, not just a school-term project? Has anyone thought about that or may have already moved forward? Is that any commercial or more updated Java based RTP stack currently? I searched with google. Besides jrtp, a school project, and I could not find a nice one. Majority of RTPstack implementation is C/C++.
My second question is if there is the performance analysis and comparison of JMF. I know that some client applications such as SIP-Communicator adopt JMF for media delivery. But it is for one user in one machine. I wonder if any server application has adopt JMF as media relaying layer.
I appreciate any input from this community.erwin2009 wrote:
Hi, as new to JMF, I would like to ask some generic questions about JMF from this communitySure/
Though including RTP stack, JMF is only compatible to old RTP draft, RFC1889. I know that Sun stopped developing/supporting JMF. What is the alternative solution for JAVA RTP implementation suitable for a serious SERVER project, not just a school-term project? Has anyone thought about that or may have already moved forward? Is that any commercial or more updated Java based RTP stack currently? I searched with google. Besides jrtp, a school project, and I could not find a nice one. Majority of RTPstack implementation is C/C++. There is one active project out there, Freedom for Media in Java, that has RTP capabilities. It's obviously not from Sun, but it's the only other RTP-capable project I am aware of, other than FOBS4Java, I believe is the name of it.
What they are suitable for is beyond my scope of knowledge, I only know of the 2 projects.
My second question is if there is the performance analysis and comparison of JMF. I know that some client applications such as SIP-Communicator adopt JMF for media delivery. But it is for one user in one machine. I wonder if any server application has adopt JMF as media relaying layer. None that I have seen, except for various projects I've helped people with on this forum. But, if someone is asking for help on a forum with his/her server application, it probably doesn't meet the guidelines you just laid out ;-)
I appreciate any input from this community.Sorry I don't have more to add to your inquires... -
I have a Macbook Pro june 2011... I have 8GB ram but I only have 256mb VRAM...
I've read some other questions about this and I realized... Why do I not have 560mb of VRAM since I have 8GB of RAM?
Is there any way to get more VRAM to play games on steam?
I've learned by reading other topics that I can't upgrade my graphics card on my Macbook Pro because it's soldered into the motherboard or somthing like that, but please tell me if there is any way to get more video ram by chaning some setting or upgrading something else. I'd also like to know why I only have 256MB of VRAM when I have 8GB of RAM, since I have 8GB of RAM I thought I was supposed to have 560mb of VRAM...
So the two questions are...
Is there any way to upgrade my VRAM, so that I can play games on steam?
Why do I only have 256MB VRAM when I have 8GB total RAM?
Other Info:
I have a quad core i7 Processor.
My graphcics card is the AMD Radeon HD 6490M.
I am also trying to play games on my BOOTCAMPed side of my mac, or my Windows 7 Professional side.
THANK YOU SO MUCH IF YOU CAN REPLY,
DylanThe only two items that a user can change on a MBP are the RAM and HDD (Retinas not included). You have what the unit came with and the only way you will be able to change that is to purchase a MBP with superior graphics
If you are very much into gaming, the I suggest A PC. They are far superior for that type of application to a MBP.
Ciao.
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