General question about thread-safe program
Obviously in multi-user application, especially web-based application, we will need to consider thread safety. However, modern web servers and DBMS are already threaded, so to what extent the application programmer are freed from this worrying, and in what situation we must consider thread-safe in our code?
Thanks
if you use a J2EE compliant application server and write custom business object as enterprise beans, all concurrent access is handled by the server. however, if you code accesses resources concurrently, you need to handle this yourself. e.g. if a business class write to a file and multiple instances of this class in multiplt threads are running, you need to handle the access of these resources in your code (e.g. keyword "synchronized" or custom locking mechanisms).
Similar Messages
-
Hi all,
I'm new to editing with proxies in Premiere and have some questions about how to handle the relationship with After Effects. Say I have a rough cut (with proxies) and I want to send it to AE to do some effects. The simplest thing to do seems to be to replace the proxies with the originals in Premiere, send the project to AE and do my thing. But if I then want to send the project back to Premiere, it will involve the original files, which are too machine-intensive for me to edit. In theory, it seems like there should be a way to send the project with original footage to AE, do effects, send it back to Premiere, and then replace it with proxies to do further editing while retaining the effects.
This leads to a confusion about how AE works. When I do an effect, am I correct in assuming that it does nothing to the original file? If that's the case, it seems like it shouldn't matter (in the editing stage) what file AE "applies" an effect to (proxy or original). But I feel like there's a hitch in this workflow. The same question could also be asked about going back and forth in Speed Grade.
Perhaps there is no real answer to this and the best option is to save effects and grading for after I have picture lock, but sometimes that's not entirely possible or convenient, etc.
Hopefully this makes some sense—It's a little hard to explain.
Thanks.Hi Mark,
Here are the specific sections of the manual that should give you the best explanation regarding the Check out/in workflow for FCP projects in Final Cut Server:
Check out:
http://documentation.apple.com/en/finalcutserver/usermanual/#chapter=7%26section =5
Editing:
http://documentation.apple.com/en/finalcutserver/usermanual/#chapter=7%26section =6
Check in:
http://documentation.apple.com/en/finalcutserver/usermanual/#chapter=7%26section =7
-Daniel -
Newbie question - general question about e-mail sync
Hi,
I have a general question about email sync and BlackBerry smartphones. Are there any devices that allow email syncing with a Microsoft Exchange 2007 system that do not require the BlackBerry Enterprise server?
Thanks; sorry if this has been asked before but I was unable to find it in the forums, documentation, etc. Everything I found assumes that for this kind of environment you will be using a BlackBerry Enterprise solution, but I can't assume.
Thanks again.
Solved!
Go to Solution.Hi and Welcome to the Forums!
If the Exchange server has anything that faces the internet (OWA, POP, IMAP), then BIS can be used to handle email (only email...calendar and contacts require BES to sync OTA).
Or, a PC, inside the network (but with an internet path) and logged into the email server (using Outlook), can be left running, using the RIM Desktop Software's Desktop Redirector capability to forward messages to the BB.
Those are basically the options.
Hope that helps! Let us know!
Occam's Razor nearly always applies when troubleshooting technology issues!
If anyone has been helpful to you, please show your appreciation by clicking the button inside of their post. Please click here and read, along with the threads to which it links, for helpful information to guide you as you proceed. I always recommend that you treat your BlackBerry like any other computing device, including using a regular backup schedule...click here for an article with instructions.
Join our BBM Channels
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PIN: C0001B7B4 Display/Scan Bar Code
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PIN: C0005A9AA Display/Scan Bar Code -
General question about iTunes Match and multiple libraries
Hello to everyone,
I have a general question about the iTunes Match service, which is available since yesterday in my country (Italy). Currently my library situation is the following:
Computer A (desktop, Windows 7): "big" iTunes library (about 20 GB), at the moment not associated with my Apple ID
Computer B (MacBook Air 2011): "small" iTunes library (about 5 GB), associated with my Apple ID
At the moment, both my iOS devices (iPhone 4 and iPad 2) are synchronized with the smaller library on the MacBook Air.
Question is as follows: should I subscribe to iTunes Match, would it be possible to upload the "big" library (provided I associate it with my Apple ID) to iCloud while keeping my devices synchronized with the "small" one?
Ideally, at the end of the day, the situation should be the following: both iOS devices with music from the small library + possibility of downloading songs from iCloud (coming from the big one). Is this possible?
Maybe the question sounds stupid, but I want to be sure about this before paying for the service.
Thanks a lot.Yes, you could also associate your larger library with iTunes match if you associated your Apple ID with it. However any purchases in the library made from another Apple ID will not be matched with iTunes much.
If both libraries are part of iTunes match, then all your devices will see all of the content from both libraries, which content you choose to have on those devices and which you have accessible via iTunes match is entirely up to you. -
General Question about SAP Documentation. Where to find?
Hello,
I am relatively new in the SAP business and so I have some general questions about the SAP Documentation.
Often internet-links like
http://help.sap.com/printdocu/core/Print46c/en/data/pdf/FIBP/FI-AP-AP-PT.pdf
are posted here by group members.
But where do these group members find these documents?
All I can see at help.sap.com is IDES (the model company created by SAP)and the WWW-version of the SAP-Bibliothek.
Were can I find these PDF-Files?
I would appreciate any hint and tip!
Thank you!
Kakuethats true! i dont know how to find either. Everytime i need something i ask on the forum.
Here's a good link
http://www.easymarketplace.de/online-pdfs.php
Plz reward points if helpfull -
Some general questions about multi-threading
Hey Everybody,
I have a dilemma with a multi-threaded program that I have written.
Well to be truthful I actually wrote the program with no consideration whatsoever for multithreading.
As a result of this complete lack of concern I get a completely hung user interface.
My program performs a lot of network communications over URL��s and also writes information from URL��s to disk. The combination of networking and I/O in my program and the fact that I have not built multi-threading into the program has lead to complete failure of the user interface. When I say complete failure I mean complete failure. If it were only button��s not responding then I wouldn��t be all that worried, however the entire drawing area of my programs ��Frame�� completely freezes. It��s cool if nothing is maximized or minimized over the frame but as soon as this happens my programs drawing area has a ��serious hang over!��.
I have begun learning about threads, in principle they sound wicked however in practice they have proven to be a brain tease (oops �K.. honesty).
The difficulty of threads should not be all that daunting to me, however I have a couple of very simple questions that I would love to have answered�K..anybody out there!!!!!!!!!
This is the normal basic method of running a thread that I have been attempting to incorporate into my program:
1). Extend the thread class,
2). Override the run() method in the subclass (created from step 1),
3). Create an instance of the subclass,
4). Call the start() method on the instance (from step 3).
I have read that every statement the thread will execute is contained within it��s run() method.
Question 1). This being the case is it possible to have member variables or methods inside a class that extends thread? Please explain!
Question 2). Can a class that extends thread contain a constructor? Please explain!
Question 3). If a subclass of thread cannot contain a constructor as I assume to be the case then how can code executing within the newly spawned thread reference information from the object that spawned it?
If anybody out there on the great net can answer even half of one of these questions I will be more than grateful. Thanks for your time, and rock on Java!
DavidThread t = new Thread(MyRunnableDerivedClass);
t.start();I hope it is understood that MyRunnableDerivedClass is actually an object of the MyRunnableDerivedClass. sorry for the confusion.
so here's a thread that reads from a file using constructors, member variables, other funcs. It's not optimal but shows use of all of the above. I just typed this in so there are probably syntax errors, but you should get the point.
public class ThreadedFileReader implements Runnable
private File m_File;
byte[] contents = new byte[0];
public ThreadedFileReader( File f )
m_File = f;
public void run()
BufferedInputStream bis = null;
try
bis = new BufferedInputStream( new FileInputStream( m_File ));
int avail = bis.available();
while (avail > 0)
int oldLen = contents.length();
contents = expand( contents, avail );
bis.read( contents, oldLen, avail );
avail = bis.available();
catch (Exception e)
{ //do something witty
finally
try{ if (bis != null) bis.close(); } catch (Exception e){}
private byte[] expand( byte[] oldBuf, int addedLen )
byte[] newBuf = new char[oldBuf.length + addedLen];
System.arrayCopy( newBuf, 0, oldBuf, 0, oldBuf.length );
return newBuf;
public byte[] getContents()
return contents;
//here's where we use it
File f = new File( "c:\myfile" );
ThreadedFileReader tfr = new ThreadedFileReader( f );
Thread t = new Thread( tfr );
t.start();
t.join();
// At this point the thread has died, but the thread object still exists
byte [] data = tfr.getContents(); -
Dumb question about Thread Safety in Servlets
Hi all
I wrote this Client API for sending requests and receiving responses to / from a multivalue database. The API is called by my Servlet. Now it seems my API is not thread safe because when several people open up the servlet at the same time, the API gets totally confused. When the API calls are inside a synchronized(){} it works just fine, but obviously at a big performance hit. Is that the wrong way of doing it??
However when I was doing the ACID test locally on my machine, by opening two command prompts and excuting the same java program (with the same code in it as the servlet, but standalone) my API worked just fine. How come?
Any insights appreciated as I am just learning about thread safety now (the hard way :-( )
cheers
DejanDoes this help
Are you using one connection to the database shared by all instances
of your servlet
And is this connection create in the init method of the servlet and stored
in the servlet context.
Problem 4 people try and use your servlet at the same time, each servlet trys to
create a connection to the database and then store it in the servlet context and
this causes a problem.
Solution create a listener to create the connection and store it in the servlet context
when the servlet is created.
If this is your problem it is not advisable to use only one connection to the db
try using db pooling -
Questions about thread priority...
Situation 1) setPriority(int adsa)
public class ThreadPrioDemo1 {
static class Demo1 implements Runnable{
public void run(){ //blablabla}
public static void main(String[] asdf){
Runnable r = new Demo1();
Thread myThread = new Thread(r);
Thread mainT = Thread.currentThread();
//mainT's priority is 5, so as myThread.
mainT.setPriority(10);
//mainT's priority to MAX, this simultaneously changes myThread to 10 as well.
//or
myThread.setPriority(10);
//myThread priority to MAX, however, this does not change mainT to 10
}Question 1), why if main Thread is set to a certain priority, the thread it creates automatically change its priority to the same as well, but the reverse is different??
Situation 2) this is slightly more complex
public class ImplementingRunnable {
public static void main(String[] args) {
Thread mainT = Thread.currentThread();
for(int ii=0 ; ii<args.length ; ii++) {
Runnable r = new MyRunnable(args[ii]);
Thread t = new Thread(r);
t.setDaemon(true);
//t.setPriority(Thread.MAX_PRIORITY);
t.start();
}and
public class MyRunnable implements Runnable {
public void test(){
System.out.println("test");
String message;
public MyRunnable(String msg) {
message = msg;
public void run() {
Thread me = Thread.currentThread();
try {
for(int ii=0 ; ii<10 ; ii++) {
//case (1) me.setPriority(Thread.MIN_PRIORITY);
me.sleep(3);
System.out.println(message);
//case (2) me.setPriority(Thread.MIN_PRIORITY);
} catch (InterruptedException ie) {
}In class ImplementingRunnable, how is the commented code line related or counter-related with the commented case 1 code line in MyRunnable??
Please help
thanksLet me speak my question again very simply:
1)
Say I have two threads, 1 is main() thread, the program entry point, 2 is another thread created by main().
Now, the default priority for both two is 5. If I change the priority for main() to a certain level, the other thread created by it automatically change its priority to the same level? why? and however, the reverse (in this case, if I change the priority for the thread created by main()) is not.
2)
public class Demo{
static class MyThread implements Runnable{
public void run(){//some thing}
Thread t = new Thread(this);
t.setPriority(10);
public static void main(String[] afd){
Runnable r = new MyThread();
Thread t1 = new Thread(r);
t1.setPriority(1);
}What can you say about both bold code lines?
If I use println() to track the Priority, the final priority, that is, t1, is 1. It is logical, however, the program behaves differently without the bold code line in the static class MyThread, despite the final priority for t1, is the same, 1.
Any help by now??
thanks alot -
Asking general questions about 'computing' matters.
Hello
I'm new to the Mac world - I posted my first question on the forums today!
I have reviewed the discussions site - everything seems very specific to apple products. Where, if anywhere, could I post a general question - like this one:-
I have a notion that when one connects to a server directly (Usenet newsgroups for example) one makes a deliberate 'hole' in one's firewall, be it software or simply because one is using a NAT router. Sending messages to and receiving posts from Usenet is far quicker than using email, so I'm fairly confident that this is so.
I am well aware that any URL one visits can instantly determine much information about the connecting machine. (see http://www.browserreport.com/ as an example).
Anti-malware programs can only detect known viruses and spyware - I see no reason at all why, once one has granted a direct connection facility, between a group on a private server to
one's own machine, malware could not relatively simply be injected onto one's computer.
If the malware was currently unknown, how would one ever know?
Thanks in anticipation of a helpful response
David BHunterBD wrote:
I'm new to the Mac world - I posted my first question on the forums today!
Excellent!
I have reviewed the discussions site - everything seems very specific to apple products. Where, if anywhere, could I post a general question - like this one:-
Unfortunately, not in this forum. This forum is specifically about the discussion forum itself. It is kind of like a meta-forum. Hopefully, the moderators will just move your post somewhere more appropriate. (As indeed they just did!)
I have a notion that when one connects to a server directly (Usenet newsgroups for example) one makes a deliberate 'hole' in one's firewall, be it software or simply because one is using a NAT router.
Kind of and kind of not. Firewalls are greatly misunderstood. But essentially, yes, any internet connection you establish has some risk involved. However, the risk of making an outgoing connection is infinitesimally smaller than setting up a server to let hackers bang on 24x7.
Sending messages to and receiving posts from Usenet is far quicker than using email, so I'm fairly confident that this is so.
Really? I don't think so.
I am well aware that any URL one visits can instantly determine much information about the connecting machine. (see http://www.browserreport.com/ as an example).
Not really. It depends on what you are doing. You always give away your IP address, unless you are behind a proxy. In that case, you give away the proxy's IP address. But the proxy still knows who you really are.
If the protocol in question supports such information, then it can be determined. A web browser does send some information about you, but you can easily change it and masquerade as some other browser. With other protocols, it isn't so easy to tell what kind of OS or software is being used.
Anti-malware programs can only detect known viruses and spyware - I see no reason at all why, once one has granted a direct connection facility, between a group on a private server to
one's own machine, malware could not relatively simply be injected onto one's computer.
If the malware was currently unknown, how would one ever know?
You wouldn't
Don't grant anyone direct connection to your machine. -
Where to direct a general questions about foreign films subtitles?
I recently purchased a foreign film "Break Ke Badd" from the iTunes store. Although, it didn't specify that it had English subtitles, I assumed it did. After the full download, I tried to watch it and there weren't any English subs. I contacted iTunes and they more than happy to refund the money back to my account. Now after a few weeks, the iTunes store DOES list Eng subs for this film. I don't want to purchase it again and have to contact iTunes for another refund...Therefore my question is, is there a general question contact one could use to find an answer to my question. Basically, to verify that this movie, indeed has English subs before I re-purchase.
Any info is appreciated!Yes I know as the [https://support.mozilla.org/en-US/questions/ Questions] section is more for desktop Firefox support and the place I linked to is for "Firefox OS" support in English where some who are involved with it do post in it occasionally.
I would have moved that [https://support.mozilla.org/en-US/questions/962783 thread] to the "Firefox OS" English section, however I cannot as the [https://support.mozilla.org//questions/ Questions] and [https://support.mozilla.org/forums Contributor Forums] are not the same. -
Urgent question about Thread-safety
Hi all,
the new tiger release provides an "isReachable()" method for the "InetAddress" object.
I've found, this method is not thread-safe (see the source and output below).
It returns true for all threads, when multiple threads using this method with different adresses are running at a time and one of the addresses is reachable. This happens only on WinXp. Running on Linux, the output is like expected.
I've tried to report this as a bug. But the gurus answered, taking care of thread safety would be a "programmers task".
My question is, what can I do, to be thread-safe in my case?
W.U.
import java.util.*;
import java.net.*;
public class IsReachableTest_1 extends Thread{
static volatile int inst=1;
static final String NET_ADDR="192.168.111.";
int instance=inst++;
public void run(){
for(int i=19;i<23;i++){
try{
long start=System.nanoTime();
if(InetAddress.getByName(NET_ADDR+i).isReachable(1000))
System.out.println(""+instance+"--host found at:"+NET_ADDR+i+"--time:"+(System.nanoTime()-start)/1000000);
else
System.out.println(""+instance+"--no host at:"+NET_ADDR+i);
}catch(Exception e){System.out.println(""+instance+"--ERROR "+e.toString());}
System.out.println(""+instance+"--done.");
public static void main(String[] args) {
System.out.println(
System.getProperty("java.vendor")+" "+
System.getProperty("java.version")+" running on "+
System.getProperty("os.name")+" "+
System.getProperty("os.version"));
Vector v=new Vector();
System.out.println("\nTest 1: One after another:");
for(int i=0;i<10;i++){
IsReachableTest_1 t;
t=new IsReachableTest_1();
t.start();
try{
t.join();
}catch(Exception e){System.out.println("MAIN1: "+e.toString());}
System.out.println("\nTest 2: All together:");
inst=1;
for(int i=0;i<10;i++){
IsReachableTest_1 t;
t=new IsReachableTest_1();
t.start();
v.addElement(t);
for(Iterator i=v.iterator();i.hasNext();)
try{
((IsReachableTest_1)i.next()).join();
}catch(Exception e){System.out.println("MAIN2: "+e.toString());}
System.out.println("\nALL DONE");
And here is the output, when running on WinXp:
Sun Microsystems Inc. 1.5.0-beta running on Windows XP 5.1
Test 1: One after another:
1--no host at:192.168.111.19
1--no host at:192.168.111.20
1--host found at:192.168.111.21--time:2
1--no host at:192.168.111.22
1--done.
2--no host at:192.168.111.19
2--no host at:192.168.111.20
2--host found at:192.168.111.21--time:4
2--no host at:192.168.111.22
2--done.
3--no host at:192.168.111.19
3--no host at:192.168.111.20
3--host found at:192.168.111.21--time:1
3--no host at:192.168.111.22
3--done.
4--no host at:192.168.111.19
4--no host at:192.168.111.20
4--host found at:192.168.111.21--time:1
4--no host at:192.168.111.22
4--done.
5--no host at:192.168.111.19
5--no host at:192.168.111.20
5--host found at:192.168.111.21--time:3
5--no host at:192.168.111.22
5--done.
6--no host at:192.168.111.19
6--no host at:192.168.111.20
6--host found at:192.168.111.21--time:1
6--no host at:192.168.111.22
6--done.
7--no host at:192.168.111.19
7--no host at:192.168.111.20
7--host found at:192.168.111.21--time:1
7--no host at:192.168.111.22
7--done.
8--no host at:192.168.111.19
8--no host at:192.168.111.20
8--host found at:192.168.111.21--time:1
8--no host at:192.168.111.22
8--done.
9--no host at:192.168.111.19
9--no host at:192.168.111.20
9--host found at:192.168.111.21--time:1
9--no host at:192.168.111.22
9--done.
10--no host at:192.168.111.19
10--no host at:192.168.111.20
10--host found at:192.168.111.21--time:1
10--no host at:192.168.111.22
10--done.
Test 2: All together:
1--no host at:192.168.111.19
2--no host at:192.168.111.19
3--no host at:192.168.111.19
4--no host at:192.168.111.19
5--no host at:192.168.111.19
6--no host at:192.168.111.19
7--no host at:192.168.111.19
8--no host at:192.168.111.19
9--no host at:192.168.111.19
10--no host at:192.168.111.19
2--no host at:192.168.111.20
3--no host at:192.168.111.20
6--host found at:192.168.111.20--time:924 <----- this host does not exist!!
5--host found at:192.168.111.20--time:961 <----- this host does not exist!!
10--host found at:192.168.111.20--time:778 <----- this host does not exist!!
9--host found at:192.168.111.20--time:815 <----- this host does not exist!!
2--host found at:192.168.111.21--time:37
7--host found at:192.168.111.20--time:888 <----- this host does not exist!!
8--host found at:192.168.111.20--time:852 <----- this host does not exist!!
4--host found at:192.168.111.20--time:997 <----- this host does not exist!!
1--host found at:192.168.111.20--time:1107 <----- this host does not exist!!
3--host found at:192.168.111.21--time:38
6--host found at:192.168.111.21--time:1
5--host found at:192.168.111.21--time:1
10--host found at:192.168.111.21--time:2
2--host found at:192.168.111.22--time:3 <----- this host does not exist!!
9--host found at:192.168.111.21--time:2
7--host found at:192.168.111.21--time:1
4--host found at:192.168.111.21--time:3
1--host found at:192.168.111.21--time:39
2--done.
1--host found at:192.168.111.22--time:5 <----- this host does not exist!!
1--done.
10--host found at:192.168.111.22--time:40 <----- this host does not exist!!
3--host found at:192.168.111.22--time:192 <----- this host does not exist!!
6--host found at:192.168.111.22--time:75 <----- this host does not exist!!
8--host found at:192.168.111.21--time:230
5--host found at:192.168.111.22--time:155 <----- this host does not exist!!
4--host found at:192.168.111.22--time:78 <----- this host does not exist!!
9--host found at:192.168.111.22--time:77 <----- this host does not exist!!
7--host found at:192.168.111.22--time:76 <----- this host does not exist!!
10--done.
6--done.
4--done.
5--done.
3--done.
7--done.
9--done.
8--no host at:192.168.111.22
8--done.
ALL DONEI created this test (it's basically the same as your class):
import java.util.*;
import java.net.*;
public class IsReachableTest_2 implements Runnable {
private final String[] addresses = new String[] {
"www.sun.com",
"129.42.16.99" // www.ibm.com which is not reachable
public void run(){
try {
for (int i = 0; i < addresses.length; i++) {
final long start = System.nanoTime();
final String address = addresses;
if (InetAddress.getByName(address).isReachable(5000)) {
System.out.println(Thread.currentThread().getName() + ": Host found at: " + address +
" --time: " + (System.nanoTime() - start) / 1000);
} else System.out.println("no host at: " + address);
} catch(Exception e){
e.printStackTrace();
System.out.println("Thread " + Thread.currentThread().getName() + " DONE");
public static void main(String[] args) {
System.out.println(
System.getProperty("java.vendor") +
" " +
System.getProperty("java.version") +
" running on " +
System.getProperty("os.name") +
" " +
System.getProperty("os.version")
for (int i = 0; i < 10; i++) {
final Thread t = new Thread(new IsReachableTest_2(), "THREAD " + (i+1));
t.start();
And I get:
Sun Microsystems Inc. 1.5.0-beta running on Windows 2000 5.0
THREAD 1: Host found at: www.sun.com --time: 217653
THREAD 3: Host found at: www.sun.com --time: 214404
THREAD 6: Host found at: www.sun.com --time: 214900
THREAD 4: Host found at: www.sun.com --time: 215901
THREAD 5: Host found at: www.sun.com --time: 216666
THREAD 10: Host found at: www.sun.com --time: 216620
THREAD 9: Host found at: www.sun.com --time: 217405
THREAD 2: Host found at: www.sun.com --time: 220705
THREAD 7: Host found at: www.sun.com --time: 220845
THREAD 8: Host found at: www.sun.com --time: 221384
no host at: 129.42.16.99
Thread THREAD 4 DONE
no host at: 129.42.16.99
Thread THREAD 6 DONE
no host at: 129.42.16.99
no host at: 129.42.16.99
no host at: 129.42.16.99
no host at: 129.42.16.99
no host at: 129.42.16.99
no host at: 129.42.16.99
no host at: 129.42.16.99
no host at: 129.42.16.99
Thread THREAD 5 DONE
Thread THREAD 10 DONE
Thread THREAD 9 DONE
Thread THREAD 7 DONE
Thread THREAD 3 DONE
Thread THREAD 1 DONE
Thread THREAD 2 DONE
Thread THREAD 8 DONE
HOWEVER: I was getting some strange results every so often. Results like:
Sun Microsystems Inc. 1.5.0-beta running on Windows 2000 5.0
THREAD 3: Host found at: www.sun.com --time: 261132
THREAD 9: Host found at: www.sun.com --time: 264183
THREAD 2: Host found at: www.sun.com --time: 266447
THREAD 6: Host found at: www.sun.com --time: 266596
THREAD 8: Host found at: www.sun.com --time: 267192
THREAD 5: Host found at: www.sun.com --time: 268610
THREAD 4: Host found at: www.sun.com --time: 269849
THREAD 1: Host found at: www.sun.com --time: 280978
THREAD 7: Host found at: www.sun.com --time: 272589
THREAD 10: Host found at: www.sun.com --time: 273162
THREAD 3: Host found at: 129.42.16.99 --time: 13657
Thread THREAD 3 DONE
THREAD 4: Host found at: 129.42.16.99 --time: 4123
THREAD 2: Host found at: 129.42.16.99 --time: 9439
THREAD 5: Host found at: 129.42.16.99 --time: 6681
THREAD 8: Host found at: 129.42.16.99 --time: 7655
THREAD 6: Host found at: 129.42.16.99 --time: 8627
THREAD 9: Host found at: 129.42.16.99 --time: 10586
Thread THREAD 4 DONE
Thread THREAD 2 DONE
Thread THREAD 5 DONE
Thread THREAD 8 DONE
Thread THREAD 6 DONE
Thread THREAD 9 DONE
no host at: 129.42.16.99
Thread THREAD 7 DONE
no host at: 129.42.16.99
no host at: 129.42.16.99
Thread THREAD 10 DONE
Thread THREAD 1 DONE
Usually the first run after I had compiled the class (!?) This isn't a thread safety problem. -
Hello,
I want to get into SAP BI and have some questions about it.
Is there a big downside in installing only the BI components without the Java BI components, or is it even possible if you want to work with BI. What are the general differences between BI and Java BI?
I think the main aspects i will work with will be data warehousing and some basic reporting.
The reason why i'm asking is that i want to run the BI components in the same system as the ECC Server (its just a test system). I read that the Java BI component needs EPC and EP and that would probably be too much for a single system (6 GB RAM).
Thanks a lot in advance,
MartinThanks for your hints, they were really helpful.
As i mentioned i mainly want to work with the general Data Warehouse and Reporting capabilities, so i think it should be okay.
Actually i'm planing to write about BI and SAP within my master thesis.
Another question, what will be with SAP BI in the future regarding the Business Object acquisition? Is there still any point in learning SAP BI or will SAP BI disapear in the future? I heard that the basic BI functionality (e.g. Datawarehouse ) will still be used but the reporting capabilities would be disappear. I'm not sure if that is right and i'm really new to this topic. So any comments are welcome.
Thanks,
Martin -
Questions about a MasterQuize program
Hi, everyone.
I got a in-class case study program like this in the class:
* This class stores/represents a question that has one of two
* answers: True or False.
* <p></p>
* It needs to track the following information:
* <ul>
* <li>Question text</li>
* <li>Correct answer</li>
* <li>The user's answer to the question</li>
* <li>Points value</li>
* <li>Category</li>
* <li>Difficulty rating</li>
* </ul>
// Our question should allow us to do the following:
// - Create question (constructor) -- may be overloaded
// - Print (display) question
// - Check client's answer for correctness
// - Get points value for question (0 or max)
// - Add "No-BS" grading option
// - Getting client's answer
// - Check to see if answered by client
public class TrueFalseQuestion
// Class constants (to simplify changes to common values)
public static final int MIN_DIFFICULTY_LEVEL = 1;
public static final int MAX_DIFFICULTY_LEVEL = 5;
public static final int DEFAULT_DIFFICULTY_LEVEL = 1;
public static final int DEFAULT_POINT_VALUE = 1;
public static final String DEFAULT_CATEGORY_VALUE = "none";
// Class instance variables
private String questionText;
private String correctAnswer;
private String userAnswer;
private int pointsValue;
private String category;
private int difficultyLevel; // TODO: Set a range for difficulty levels
* @param text The literal wording of this question
* @param answer The correct answer for this question
* @param pts The total points available for this question
* @param ctgry Category keyword for this question
* @param level The perceived/intended difficulty level of this question
* <p></p>
* Defines a TrueFalseQuestion object.
public TrueFalseQuestion (String text, String answer, int pts, String ctgry, int level)
// Set starting values for all instance variables
questionText = text.trim();
correctAnswer = answer.trim();
userAnswer = null; // No user answer supplied yet
if (pts >= 1) // We assume that every problem is worth at least 1 point
pointsValue = pts;
else
pointsValue = DEFAULT_POINT_VALUE;
category = ctgry.trim();
if (level >= MIN_DIFFICULTY_LEVEL && level <= MAX_DIFFICULTY_LEVEL) // within range
difficultyLevel = level;
else
difficultyLevel = DEFAULT_DIFFICULTY_LEVEL;
// Simplified (overloaded) constructors
* @param text The literal wording of this question
* @param answer The correct answer for this question
* @param pts The total points available for this question
* <p></p>
* Defines a TrueFalseQuestion with default values for category and difficulty level.
public TrueFalseQuestion (String text, String answer, int pts)
// Call pre-existing constructor with default category and difficulty
this(text, answer, pts, DEFAULT_CATEGORY_VALUE, DEFAULT_DIFFICULTY_LEVEL);
* @param text The literal wording of this question
* @param answer The correct answer for this question
* <p></p>
* Defines a TrueFalseQuestion with the default point value, default category,
* and default difficulty level.
public TrueFalseQuestion (String text, String answer)
// Call pre-existing constructor with default points, category and difficulty
this(text, answer, DEFAULT_POINT_VALUE, DEFAULT_CATEGORY_VALUE,
DEFAULT_DIFFICULTY_LEVEL);
* @param text The literal wording of this question
* @param answer The correct answer for this question
* @param pts The total points available for this question
* @param ctgry Category keyword for this question
* <p></p>
* Defines a TrueFalseQuestion with the default difficulty level.
public TrueFalseQuestion (String text, String answer, int pts, String ctgry)
// Call pre-existing constructor with default points, category and difficulty
this(text, answer, pts, ctgry,
DEFAULT_DIFFICULTY_LEVEL);
* @param text The literal wording of this question
* @param answer The correct answer for this question
* @param ctgry Category keyword for this question
* <p></p>
* Defines a TrueFalseQuestion with the default point value and the default
* difficulty level.
public TrueFalseQuestion (String text, String answer, String ctgry)
// Use default points and difficulty
this(text, answer, DEFAULT_POINT_VALUE, ctgry, DEFAULT_DIFFICULTY_LEVEL);
* @param text The literal wording of this question
* @param answer The correct answer for this question
* @param pts The total points available for this question
* @param level The perceived/intended difficulty level of this question
* <p></p>
* Defines a TrueFalseQuestion with the default value for the question category.
public TrueFalseQuestion (String text, String answer, int pts, int level)
// Use default category
this(text, answer, pts, DEFAULT_CATEGORY_VALUE, level);
// Clients can invoke this method to retrieve the text of the current question.
// We chose to return the text instead of printing it; this allows the client
// to decide how it should be presented (via a GUI, over a network, etc.)
public String getQuestion ()
return questionText;
// This method allows the client to store the user's answer inside the
// TrueFalseQuestion object for easy comparison
public void submitAnswer (String ans)
userAnswer = ans;
// This method reports whether the submitted answer matches the correct answer
public boolean answerIsCorrect(String userAns) // This version does all the work
if (userAns == null) // No response from user (yet)
return false;
else
// Normalize and compare answers
char key = normalize(correctAnswer); // Get 't' or 'f'
char ans = normalize(userAns); // Get 't' or 'f'
return (key == ans);
public boolean answerIsCorrect ()
return answerIsCorrect(userAnswer); // Call previously-defined version
public int getPointsValue()
return pointsValue;
// Return the points awarded for the user's answer. This method does
// NOT support partial credit; answers are either correct or incorrect.
// If the "No-BS" option is selected, blank (unanswered) questions receive
// 1 point automatically; otherwise, the score will be either 0 or the
// question's normal points value.
public int getPointsEarned(boolean useNoBSRule)
System.out.println("useNoBS: " + useNoBSRule + "\tuserAnswer: " + userAnswer + "\tcorrectAnswer: " + correctAnswer);
if (useNoBSRule && (userAnswer == null))
return 1;
else if (userAnswer == null)
return 0; // Without "No-BS", treat blank problems as incorrect
if (answerIsCorrect() == false)
return 0;
else
return pointsValue;
// This method returns true if the user has submitted an answer
// for this question (regardless of whether that answer is correct)
public boolean hasBeenAnswered ()
return (userAnswer != null);
// Private helper method to convert all answers to single lowercase
// letters (in this case, 't' for TRUE and 'f' for FALSE)
private char normalize (String input)
if (input != null)
input = input.trim(); // Remove leading whitespace
input = input.toLowerCase();
return input.charAt(0);
else
return ' ';
import java.util.*;
* This class represents a complete test or quiz.
* Data stored:
* - List of questions
* - Total score earned
* - Total score possible
* - Name/title of test
* - Instructions
* - Category/class assignment
* - Student (test-taker) name
* - Date test is/was taken
* - Time started
* - Time completed
* - Maximum time allotted
* - (List of) Maximum attempts per question
* - List of attempts per question
* - List of difficulty ratings per question
* - Assignment weight
* Methods:
* - Constructor
* - Add question
* - Display question
* - Display test
* - Display instructions
* - Generate random exam
* - Take/administer test
* - Get score
* STUFF TO DO:
* - Add time/date restrictions
* - Add network access restrictions
* - Add other restrictions/allowances?
* @author (your name)
* @version (a version number or a date)
public class Test
// Class constant
public static final int MAX_NUMBER_OF_QUESTIONS = 10;
// Class instance variables
private String testName;
private int scoreEarned; // What the student earned on the exam
private int scorePossible; // Total point values of all questions
private String instructions; // Exam header text
private ArrayList<TrueFalseQuestion> questions; // Create inside constructor
// Methods
public Test (String name, String instr)
testName = name;
scoreEarned = 0;
scorePossible = 0;
instructions = instr;
questions = new ArrayList<TrueFalseQuestion>(); //[MAX_NUMBER_OF_QUESTIONS];
public String getInstructions()
return instructions;
public int getScore()
return scoreEarned;
public void addQuestion (TrueFalseQuestion q)
scorePossible += q.getPointsValue();
questions.add(q); // Automatically append question to end of test
public String displayQuestion (int position)
if (position < questions.size())
return (position+1) + ". " + questions.get(position).getQuestion();
else
return null;
public String displayTest ()
String result = "";
for (int i = 0; i < questions.size(); i++)
result += (i+1) + ". (";
TrueFalseQuestion t = questions.get(i);
result += t.getPointsValue();
result += " points)\n\n" + displayQuestion(i);
result += "\n\n";
return result;
// Get test length (number of questions)
public int length ()
return questions.size();
// Submit answer to a specific question
public boolean answer(int number, String a)
// Question numbers run from 0-(max-1) -- THIS WAS AN OFF-BY-ONE ERROR AT FIRST
if (number >= 0 && number < questions.size())
TrueFalseQuestion t = questions.get(number);
t.submitAnswer(a);
return true; // Question was answered
else
return false; // Unable to answer (nonexistent) question
// Score exam
public void scoreExam (boolean useNoBS)
scoreEarned = 0;
for (int i = 0; i < questions.size(); i++) // For each question in exam
TrueFalseQuestion t = questions.get(i); // get current question
scoreEarned += t.getPointsEarned(useNoBS);
}// Test harness for the Test and *Question classes
import java.util.*;
public class QuizDriver
public static void main(String[] args)
// Create a new Test object
Test exam = new Test("Sample Exam", "Select the correct answer for each question");
setUp(exam);
Scanner sc = new Scanner(System.in);
System.out.println(exam.getInstructions());
// Administer exam
for (int i = 0; i < exam.length(); i++)
// Print out current question
System.out.println(exam.displayQuestion(i));
// Get user answer
System.out.print("Your answer: ");
String ans = sc.nextLine();
if (ans.equals("")) // Handle blank responses for unanswered questions
ans = null;
exam.answer(i, ans);
// Get exam results
exam.scoreExam(true);
System.out.println("Your final score was " + exam.getScore() + " points.");
private static void setUp (Test t)
TrueFalseQuestion x = new TrueFalseQuestion("The sky is blue.", "true", 2);
t.addQuestion(x);
x = new TrueFalseQuestion("The first FORTRAN compiler debuted in 1957", "true", 5);
t.addQuestion(x);
x = new TrueFalseQuestion("Spock was a Vulcan", "false", 3);
t.addQuestion(x);
}This program is far from finishing.
I have many questions about this program, but let me ask this one first:
In the TrueFalseQeustion class, why are there so many constructors? What is the purpose of setting some of the variables to default values?
Thank you very much!!!
Edited by: Terry001 on Apr 16, 2008 10:02 AMnewark wrote:
Stop ignoring the error messages. You seem to think that an error message means you're doing the assignment wrong. It's probably a simple fix. Post the exact error messages, as well as the code that corresponds to them. The error message will tell you exactly what line the problem occurs on, so you know right where to look.Hi,
After some modifications, the program now gives me the result the assignment wants when I run it. But I still have trouble with the MultipleChoiceQuestion class
Here is the complete program
QuizDriver class
// Test harness for the Test and *Question classes
import java.util.*;
public class QuizDriver
public static void main(String[] args)
// Create a new Test object
Test exam = new Test("Sample Exam", "Select the correct answer for each question");
setUp(exam);
Scanner sc = new Scanner(System.in);
System.out.println(exam.getInstructions());
// Administer exam
for (int i = 0; i < exam.length(); i++)
// Print out current question
System.out.println(exam.displayQuestion(i));
// Get user answer
System.out.print("Your answer: ");
String ans = sc.nextLine();
if (ans.equals("")) // Handle blank responses for unanswered questions
ans = null;
exam.answer(i, ans);
// Get exam results
exam.scoreExam(true);
System.out.println("Your final score was " + exam.getScore() + " points.");
private static void setUp (Test t)
Question x;
x = new TrueFalseQuestion("The sky is blue.", "true", 2);
t.addQuestion(x);
x = new TrueFalseQuestion("The first FORTRAN compiler debuted in 1957", "true", 5);
t.addQuestion(x);
x = new TrueFalseQuestion("Spock was a Vulcan", "false", 3);
t.addQuestion(x);
x = new MultipleChoiceQuestion("What is the color of the car\na.Red\nb.Green", "a. Red", 3);
t.addQuestion(x);
x = new MultipleChoiceQuestion("What is the name of this class\na.CSE110\nb.CSE114", "b, CSE114", 3);
t.addQuestion(x);
}Test
public class Test
// Class constant
public static final int MAX_NUMBER_OF_QUESTIONS = 10;
// Class instance variables
private String testName;
private int scoreEarned; // What the student earned on the exam
private int scorePossible; // Total point values of all questions
private String instructions; // Exam header text
private ArrayList<Question> questions; // Create inside constructor
// Methods
public Test (String name, String instr)
testName = name;
scoreEarned = 0;
scorePossible = 0;
instructions = instr;
questions = new ArrayList<Question>(); //[MAX_NUMBER_OF_QUESTIONS];
public String getInstructions()
return instructions;
public int getScore()
return scoreEarned;
public void addQuestion (Question q)
scorePossible += q.getPointsValue();
questions.add(q); // Automatically append question to end of test
public String displayQuestion (int position)
if (position < questions.size())
return (position+1) + ". " + questions.get(position).getQuestion();
else
return null;
public String displayTest ()
String result = "";
for (int i = 0; i < questions.size(); i++)
result += (i+1) + ". (";
Question t = questions.get(i);
result += t.getPointsValue();
result += " points)\n\n" + displayQuestion(i);
result += "\n\n";
return result;
// Get test length (number of questions)
public int length ()
return questions.size();
// Submit answer to a specific question
public boolean answer(int number, String a)
// Question numbers run from 0-(max-1) -- THIS WAS AN OFF-BY-ONE ERROR AT FIRST
if (number >= 0 && number < questions.size())
Question t = questions.get(number);
t.submitAnswer(a);
return true; // Question was answered
else
return false; // Unable to answer (nonexistent) question
// Score exam
public void scoreExam (boolean useNoBS)
scoreEarned = 0;
for (int i = 0; i < questions.size(); i++) // For each question in exam
Question t = questions.get(i); // get current question
scoreEarned += t.getPointsEarned(useNoBS);
}Question
public class Question
// Class constants
public static final int MIN_DIFFICULTY_LEVEL = 1;
public static final int MAX_DIFFICULTY_LEVEL = 5;
public static final int DEFAULT_DIFFICULTY_LEVEL = 1;
public static final int DEFAULT_POINT_VALUE = 1;
public static final String DEFAULT_CATEGORY_VALUE = "none";
// Class instance variables
protected String questionText;
protected String correctAnswer;
protected String userAnswer;
protected int pointsValue;
protected String category;
protected int difficultyLevel; //TODO: set a range for difficulty levels
// Constructors
public Question (String text, String answer, int pts, String ctgry, int level)
questionText = text.trim();
correctAnswer = answer.trim();
userAnswer = null;
if (pts >= 1)
pointsValue = pts;
else
pointsValue = DEFAULT_POINT_VALUE;
category = ctgry.trim();
if (level >= MIN_DIFFICULTY_LEVEL && level <= MAX_DIFFICULTY_LEVEL)
difficultyLevel = level;
else
difficultyLevel = DEFAULT_DIFFICULTY_LEVEL;
// Overloaded (simplied) constructors
public Question (String text, String answer, int pts)
this(text, answer, pts, DEFAULT_CATEGORY_VALUE, DEFAULT_DIFFICULTY_LEVEL);
public Question (String text, String answer, int pts, String ctgry)
this(text, answer, pts, ctgry, DEFAULT_DIFFICULTY_LEVEL);
public Question (String text, String answer, String ctgry)
this(text, answer, DEFAULT_POINT_VALUE, ctgry, DEFAULT_DIFFICULTY_LEVEL);
public Question (String text, String answer, int pts, int level)
this(text, answer, pts, DEFAULT_CATEGORY_VALUE, level);
// Methods
public String getQuestion ()
return questionText;
// Use this method to store user answers
public void submitAnswer (String ans)
userAnswer = ans;
public boolean answerIsCorrect (String userAns)
if (userAns == null)
return false;
else
// Normalize and compare answers
char key = normalize (correctAnswer); //Get the first letter of an answer
char ans = normalize (userAns); //Get the first letter of an answer
return (key == ans);
public boolean answerIsCorrect ()// Why do we need two answerisCorrect() methods?
return answerIsCorrect (userAnswer);
public int getPointsValue ()
return pointsValue;
public int getPointsEarned (boolean userNoBSRule)
System.out.println ("useNoBS: " + userNoBSRule + "\tuseAnswer: " + userAnswer + "\tcorrectAnswer: " + correctAnswer);
if (userNoBSRule && (userAnswer == null))
return 1;
else if (userAnswer == null)
return 0;
if (answerIsCorrect() == false)
return 0;
else
return pointsValue;
public String getCorrectAnswer ()
return correctAnswer;
public boolean hasBeenAnswered ()
return (userAnswer != null);
private char normalize (String input)
if (input != null)
input = input.trim();
input = input.toLowerCase();
return input.charAt(0);
else
return ' ';
TrueFalseQuestion
public class TrueFalseQuestion extends Question
public TrueFalseQuestion (String text, String answer, int pts, String ctgry, int level)
super(text, answer, pts, ctgry, level);
public TrueFalseQuestion (String text, String answer, int pts)
super(text, answer, pts, DEFAULT_CATEGORY_VALUE, DEFAULT_DIFFICULTY_LEVEL);
public TrueFalseQuestion (String text, String answer, int pts, String ctgry)
super(text, answer, pts, ctgry, DEFAULT_DIFFICULTY_LEVEL);
public TrueFalseQuestion (String text, String answer, String ctgry)
super(text, answer, DEFAULT_POINT_VALUE, ctgry, DEFAULT_DIFFICULTY_LEVEL);
public TrueFalseQuestion (String text, String answer, int pts, int level)
super(text, answer, pts, DEFAULT_CATEGORY_VALUE, level);
// Methods
public String[] getPossibleAnswerChoice ()
String[] possibleAnswerChoice = {"true", "false"};
return possibleAnswerChoice;
} MultipleChoiceQuestion
public class MultipleChoiceQuestion extends Question
public MultipleChoiceQuestion (String text, String answer, int pts, String ctgry, int level)
super(text, answer, pts, ctgry, level);
public MultipleChoiceQuestion (String text, String answer, int pts)
super(text, answer, pts, DEFAULT_CATEGORY_VALUE, DEFAULT_DIFFICULTY_LEVEL);
public MultipleChoiceQuestion (String text, String answer, int pts, String ctgry)
super(text, answer, pts, ctgry, DEFAULT_DIFFICULTY_LEVEL);
public MultipleChoiceQuestion (String text, String answer, String ctgry)
super(text, answer, DEFAULT_POINT_VALUE, ctgry, DEFAULT_DIFFICULTY_LEVEL);
public MultipleChoiceQuestion (String text, String answer, int pts, int level)
super(text, answer, pts, DEFAULT_CATEGORY_VALUE, level);
// Methods
String possibleAnswers;
public String getPossibleAnswers ()
return possibleAnswers;
public void addAnswerChoice (String answerChoice)
String ansChoice = answerChoice;
questionText += "\nansChoice";
possibleAnswers = answerChoice;
public void printAnswerChoice ()
System.out.println (questionText);
} I don't understand why the assignment wants me to build a method in the MultpleChoiceQuestion class to store the potential answer choices, I can make the program display the potential answer choices by including them in the questionText as following in the QuizDriver class
Question x;
x = new MultipleChoiceQuestion("What is the color of the car\na.Red\nb.Green", "a. Red", 3);
t.addQuestion(x); I don't know how to allow the client to construct the list of answer choices one at a time(add one potential answer choice by calling the addAsnwerChoices() method once)
Here are a few original sentences of my assignment which describe what I should do with the MultipleChoiceQuestion class
Using TrueFalseQuestion as a model, develop a new MultipleChoiceQuestion class that can be used to represent a problem where the user must select one of several answer choices (e.g., "Select answer (a), (b), (c), or (d)."). This new question type should have all of the same externally-visible functionality as TrueFalseQuestion, except that it must:
maintain a list of potential answer choices
provide a method that allows the client to construct the list of answer choices one at a time (i.e., the client should be able to call an addAnswerChoice() method to pass a new answer option to the MultipleChoiceQuestion.)
display (as part of the question text) the list of answer choices with appropriate letters ("abcd" instead of "0123") I don't understand what these sentences mean.
1. "Maintain a list of potential answer choices"-- this reminds me of the getPossibleAnswerChoice() method in the TrueFalseQuestion class
public String[] getPossibleAnswerChoice ()
String[] possibleAnswerChoice = {"true", "false"};
return possibleAnswerChoice;
}I wonder that if the potential answer choices I have to store in the MultipleChoiceQuestion class are only letters "a", "b", "c", "d", etc, or include the answer text coming after the letters(eg. a.Red, b.Green)
2. "provide a method that allows the client to construct the list of answer choices one at a time". How do I achieve the functionality "one at a time"? Do I need to pass the input of the client (a potential answer choice) to the variable of the method which stores the list of potential answers?
3. "display (as part of the question text) the list of answer choices with appropriate letters". My question here is that: When the client type in one possible answer, should I append it to the variable questionText? (So I use the questionText variable in the methods of the first and second steps)
Thank you very much for your nice help!
Edited by: Terry001 on Apr 21, 2008 8:01 AM -
General question about Mountain Lion
I've kept clear of Lion on both my MACS because of all the "bad press" it got, I'm still running Snow Leopard on my MACS and I've never had a day of problems with either. Also I run Logic Studios on both my MACS and didn't want to chance having issues with interface compatability, lack of drivers and such. My question is kind of simple and for better or worse comes down to opinion, what is the general feeling about Mountain Lion? Is it a big improvement over Lion? Is it more stable with less bugs? Any issues running Logic? I'm "playing with the idea" of upgrading but I want to do my research first. If Mountain Lion is not a big improvement over Lion or if people are having issues with running Logic I'm going to stick with SL.
Thanks for your opinions in advance.Be cautious about listening too much to replies you're likely to get. These sort of questions in a place like this are like magnets to people who are having problems and want to complain about it. You're likely to hear some horror stories that don't represent the majority of cases.
ML has been excellent so far for me, faster than Lion and no serious bugs I've discovered so far. But if you upgrade, be sure to do your homework: backup, check compatibility of all your software (including things like printer drivers) and repair the hard drive with Disk Utility before installing. -
I have a handful of general questions about Firefox OS as a consumer..
I couldn't find a better place to post this, so I'm trying on here.
I'm in the market for a tablet (high-end), and I'm holding off on getting an Android-powered one because of Firefox OS. However, I have some general questions and concerns regarding performance, software and hardware. Here they are.
1. Is the Firefox OS interface as responsive as a native experience on say an iPad or an Android tablet? (Is there any lag on swipes between screens, button presses, etc?) If not, will it be in the future?
2. Will I miss the Android marketplace or the Apple app store, being restricted to only HTML5 apps? Do you think this will become an irrelevant question as the HTML5 app ecosystem grows?
3. Do you think the quality of HTML5 apps will be inferior to those from existing app stores because they are free?
4. Will the Firefox browser be the only one available in Firefox OS? (i.e. will there be the option to use Chrome, Opera or any other browser if the user so wishes?)
5. Will Firefox OS include useful utility apps, such as an alarm clock, a calendar, a weather app, etc?
6. I read a lot, both on the web (news, video game reviews), as well as ebooks. Will Firefox OS on a tablet be a pleasant experience conducive to e-reading? (Will it include a good ebook reader app?)
7. Will there be a high-end Firefox OS tablet that is comparable in specs to the Nexus 10? (i.e. impressive screen resolution, powerful CPU/GPU, lots of inputs/outputs like USB, HDMI, microSD, etc) When do you think such a device might become available?
8. Would it be possible to flash Firefox OS onto say a Nexus 10 or other tablet or phone if one wanted to use it as their OS instead?
Thanks!1. Depends on the phone but a avererage power android phone would likely cost the same as a high end firefox os phone.
2. HTML 5 is really the future of the web, I've heard that Firefox will let you package apps to be playable offline, but not sure if thats true.
3. I '''think''' Firefox OS may have paid apps that will be restricted to users who buy them.
4. I think Mozilla will be nice enough to let Google and Opera make browsers. Google let Mozilla do that with FF for android.
5. See the simulator https://addons.mozilla.org/en-us/firefox/addon/firefox-os-simulator/
6. too early to say
7. too early to say, but Foxconn (helps apple) makes some apple products, so yes in the future is see a high end Firefox OS tablet 2-3 years down the road.
8. not sure
NOTE: Please note that we are only contributors, we dont develop firefox os.
You can ask more on the IRC channel as there are likely devs there.
https://client00.chat.mibbit.com/?server=irc.mozilla.org
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