| analytical Skill for Java Development |
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- 5
- Bug or featureHi, can someone explain the behaviour of that snip
public class Test
{
public static void main(String[] args)
{
try
{
Class c = Class.forName("BUG");
}
catch (ClassNotFoundException e)
{
}
System.out.println("Everything works?");
try
{
Class c = Class.forName("NotbUg");
}
catch (ClassNotFoundException e)
{
}
System.out.println("Still works?");
try
{
Class c = Class.forName("bUg");
}
catch (ClassNotFoundException e)
{
}
System.out.println("Everything works!!");
}
}
class BUG
{
}
In not works on JDK 1.4.2 but JDK 1.1.4. Bug or feature that question is.
Thanks in advance.
Serge
- 7
- why allow multiple classes in one file?Hello,
I'm pretty new to Java, so please don't yell at me if my question is
dumb.
Each public file should be in a separate file. I don't understand why
is it allowed for a file contain additional non-public (default)
classes. Why is it not one class per file, public or default?
Thanks,
Hilbert
- 10
- Final member troubleimport java.awt.Image;
import javax.imageio.ImageIO;
import java.io.*;
public class FinalTryCatch {
final Image someImage;
public FinalTryCatch() {
try {
someImage = ImageIO.read(new File("someImageFile.gif"));
} catch (IOException ioe) {
someImage = null;
}
}
public static void main(String[] args) {
FinalTryCatch f = new FinalTryCatch();
// Do some stuff
}
}
This fails to compile with "variable someImage might already have been
assigned" on "someImage = null;". Remove that line and it complains,
"variable someImage might not have been initialized". Obviously. What would
you do in this situation? Make the variable non-final? Have the constructor
throw IOException? Something else?
- 10
- Swing - how to catch all eventsProgramming in java for a while now, but I still have this silly
problem that I don't know if the experts has a simple answer.
I have a Swing app. Yes, simple stuff eh. Next, user logins to use
the app. If they don't do anything (mouse move, key press) for a
while, then I log out. The think is that detecting a mouse event, I
have to register with each of the tabpane of the app. I don't like
that. Also, I have to register with each components within the panel.
The same for keyboard. For keyboard, it seems I can register event
for just any component (with appropriate modifer to get the input map
and action map). However, I still have to register all keys which are
alot. I want the ability to catch the event from top down. Anyevent
would goes through my filters first. Would this be possible? How do
I solve this simple and common problem? Thank you very much in
advance.
- 12
- aliasHi,
I may be jumping guns here. I mean I'm totally new to java and yet, I
feel the need to do something like this for typing much less,
o = System.out.println; // problem, what data type for var of o here?
undefined.
or
alias o = System.out.println; // alias is supposed to be a special
command or the sort?
then, I do something like this
for (int i=0; i < 5; i++) {
switch(i)
case 0:
case 2:
case 4:
o(i + " is an even number"); // instead of System.out.println(i +
" is an even number");
break;
case 1:
case 3:
case 5:
o(i + " is an odd number"); // instead of System.out.println(i + "
is an odd number");
break;
default:
o(i + " is neither an odd nor even number");
// instead of System.out.println(i + " is neither an odd nor even
number");
}
Doable? How? TIA.
- 12
- Hashtable qWhen traversing an Enumeration of Hashtable keys, I know that modifying the
HT can cause problems. But is doing lookups okay? E.g., in the following
code:
<assume ht is a reference to a Hashtable object>
Enumeration e = ht.keys();
Object o;
while(e.hasmore()) {
o = e.next();
System.out.println(o + ": " + ht.get(o));
}
Is this guaranteed to print out all of the key-value pairs?
- 12
- JTextField : limit number of input charactersHi,
How can I do limit the number of character into a JTextField component ? I'm
a Newbie, and I've some problem with this.
Other question, in a JTable, how can I do to put a DropDown into a field
from a column ?
Thanks for all
Bernard
- 13
- 14
- "this" statement?The "this" statement that is used in the method "exitRoom" and "explore" is
that synonymous with an "Explorer" object?
public class Explorer implements PlayerBehavior {
private String my_name;
private String my_secret_word;
private RoomBehavior where_I_am_now;
public Explorer(String name, String word){
my_name = name;
my_secret_word = word;
where_I_am_now = null;
}
public String speak(){
return my_secret_word; }
public void exitRoom(){
if ( where_I_am_now != null )
{ where_I_am_now.exit(this);
where_I_am_now = null;
}
}
public boolean explore(RoomBehavior r){
if ( where_I_am_now != null )
{ exitRoom(); }
boolean went_inside = r.enter(this);
if ( went_inside )
{ where_I_am_now = r; }
return went_inside;
}
public RoomBehavior locationOf(){
return where_I_am_now; }
}
- 15
- Array reference in for loopI have a validate method in a bean class that works and now I want to
condense it into a for loop.
Here is what I have:
//firstname and lastname are declared earlier
public boolean validate()
{
boolean allOk=true;
if (firstName.equals("")) {
errors.put("firstName","Please enter your first name");
allOk=false;
}
if (lastName.equals("")) {
errors.put("lastName","Please enter your last name");
allOk=false;
}
return allOk;
}
My attempt doesnt work because I cant seem to figure out how to put
the array reference in the key part of the errors.put method:
public boolean validate()
{
boolean allOk=true;
String [] myarray = {firstname, lastname}
for(int i=0;i < myarray.length;i++)
{
if (myarray[i].equals("")) {
errors.put(myarray[i],"Please enter your " + myarray[i]);
allOk=false;
}
}
return allOk;
}
The results dont validate any of my data so I assume I have something
wrong with my array. Please advise.
- 15
- RPN CalculatorI've searched the web for a couple of hours for a calculator with this
requirements
It has to
0) be free to download and use
1) be able of RPN
2) be able to run in a standalone window (i.e. not in a web browser)
3) be written in java
4) preferably be open source
Someone who can give me a hint???
- 15
- converting paper space to model space in dxf filesHello wise guys!
I'm writing a piece of code (java) that shold parse and draw the
content of a DXF file. The trouble is that some blocks (usually texts
or legend) are given in paper space. Can anyone give me a hint how
paper coordinates should be converted to model coordinates? Thanks a
lot!
Adrian
- 15
- JavaScript for MaximizationHi. I want onLoad(), to make my current IE window "maximized." I can resize
the window to Screen.width/height but the problem with that is that it
includes the full screen height (including the task-bar) and I need it to be
without the task bar. Any way to do this? Preferably a way that's
browser-independant but IE-specific if need be.
Alex
- 15
- Long delay using SSLSocketFactoryHi all,
I need to do HTTPS requests from a WLS container through a proxy which
requires encoded username/password authentication. Therefore, I am
using an extension of SSLSocketFactory (part of SUN's JSSE), which
does the proxy authentication for me and the tunnel handshake as well.
Principally, the solution I thought of works. However, after starting
the WLS, the very first connection to the proxy takes more than two
minutes. Running the test once again, the connection to the proxy is
established almost instantaneously. Can anyone explain the long delay
in the first connection? It occurs when invoking method
SSLSocketFactory.getDefault() (see the below code snippet).
I scanned the port of the proxy and found no activity during the
delay. Neither, there are any outgoing TCP packages from the source
machine (where the JVM is running). So I assume that the delay is not
due to a network problem; it must be somewhere in the depths of the
JSSE classes.
Best regards,
Thomas Mantay
Here is the code I am using:
import java.net.*;
import java.io.*;
import java.security.*;
import sun.misc.BASE64Encoder;
import javax.net.*;
import javax.net.ssl.*;
public class SSLTunnelSocketFactory extends SSLSocketFactory {
private String tunnelHost;
private int tunnelPort;
private SSLSocketFactory dfactory;
private String tunnelPassword;
private String tunnelUserName;
private boolean socketConnected = false;
private int falsecount = 0;
/**
* Constructor for the SSLTunnelSocketFactory object
*
*@param proxyHost The url of the proxy host
*@param proxyPort the port of the proxy
*@param proxyUserName username for authenticating with the
proxy
*@param proxyPassword password for authenticating with the
proxy
*/
public SSLTunnelSocketFactory(String proxyHost, int proxyPort,
String proxyUserName, String proxyPassword) {
NLUtil.ldebug("SSLTunnelSocketFactory", "Constructor", "creating
Socket Factory with password/username");
tunnelHost = proxyHost;
tunnelPort = proxyPort;
tunnelUserName = proxyUserName;
tunnelPassword = proxyPassword;
NLUtil.ldebug("SSLTunnelSocketFactory", "Constructor", "before
getDefault()");
Here is the line that causes the delay:
dfactory = (SSLSocketFactory) SSLSocketFactory.getDefault();
NLUtil.ldebug("SSLTunnelSocketFactory", "Constructor", "after
getDefault()");
}
/**
* Gets the supportedCipherSuites attribute of the
SSLTunnelSocketFactory
* object
*
*@return The supportedCipherSuites value
*/
public String[] getSupportedCipherSuites() {
return dfactory.getSupportedCipherSuites();
}
/**
* Gets the defaultCipherSuites attribute of the
SSLTunnelSocketFactory
* object
*
*@return The defaultCipherSuites value
*/
public String[] getDefaultCipherSuites() {
return dfactory.getDefaultCipherSuites();
}
/**
* Gets the socketConnected attribute of the
SSLTunnelSocketFactory object
*
*@return The socketConnected value
*/
public synchronized boolean getSocketConnected() {
return socketConnected;
}
/**
* Creates a new SSL Tunneled Socket
*
*@param s Ignored
*@param host destination host
*@param port destination port
*@param autoClose wether to close the socket
automaticly
*@return proxy tunneled socket
*@exception IOException raised by an IO error
*@exception UnknownHostException raised when the host is
unknown
*/
public Socket createSocket(Socket s, String host, int port,
boolean autoClose)
throws IOException, UnknownHostException {
Socket tunnel = new Socket(tunnelHost, tunnelPort);
doTunnelHandshake(tunnel, host, port);
SSLSocket result = (SSLSocket) dfactory.createSocket(tunnel,
host, port, autoClose);
result.addHandshakeCompletedListener(
new HandshakeCompletedListener() {
public void handshakeCompleted(HandshakeCompletedEvent
event) {
NLUtil.ldebug("SSLTunnelSocketFactory", "handshakeCompleted",
"Handshake Finished!");
NLUtil.ldebug("SSLTunnelSocketFactory", "handshakeCompleted",
"CipherSuite :" + event.getCipherSuite());
NLUtil.ldebug("SSLTunnelSocketFactory", "handshakeCompleted",
"SessionId: " + event.getSession());
NLUtil.ldebug("SSLTunnelSocketFactory", "handshakeCompleted",
"PeerHost: " + event.getSession().getPeerHost());
setSocketConnected(true);
}
});
// thanks to David Lord in the java forums for figuring out
this line is the problem
// result.startHandshake(); //this line is the bug which stops
Tip111 from working correctly
return result;
}
/**
* Creates a new SSL Tunneled Socket
*
*@param host destination host
*@param port destination port
*@return tunneled SSL Socket
*@exception IOException raised by IO error
*@exception UnknownHostException raised when the host is
unknown
*/
public Socket createSocket(String host, int port)
throws IOException, UnknownHostException {
return createSocket(null, host, port, true);
}
/**
* Creates a new SSL Tunneled Socket
*
*@param host Destination Host
*@param port Destination Port
*@param clientHost Ignored
*@param clientPort Ignored
*@return SSL Tunneled Socket
*@exception IOException Raised when IO error occurs
*@exception UnknownHostException Raised when the destination
host is
* unknown
*/
public Socket createSocket(String host, int port, InetAddress
clientHost,
int clientPort)
throws IOException, UnknownHostException {
return createSocket(null, host, port, true);
}
/**
* Creates a new SSL Tunneled Socket
*
*@param host destination host
*@param port destination port
*@return tunneled SSL Socket
*@exception IOException raised when IO error occurs
*/
public Socket createSocket(InetAddress host, int port)
throws IOException {
return createSocket(null, host.getHostName(), port, true);
}
/**
* Creates a new SSL Tunneled Socket
*
*@param address destination host
*@param port destination port
*@param clientAddress ignored
*@param clientPort ignored
*@return tunneled SSL Socket
*@exception IOException raised when IO exception occurs
*/
public Socket createSocket(InetAddress address, int port,
InetAddress clientAddress, int clientPort)
throws IOException {
return createSocket(null, address.getHostName(), port, true);
}
/**
* Sets the socketConnected attribute of the
SSLTunnelSocketFactory object
*
*@param b The new socketConnected value
*/
private synchronized void setSocketConnected(boolean b) {
socketConnected = b;
}
/**
* Description of the Method
*
*@param tunnel tunnel socket
*@param host destination host
*@param port destination port
*@exception IOException raised when an IO error occurs
*/
private void doTunnelHandshake(Socket tunnel, String host, int
port) throws IOException {
NLUtil.ldebug("SSLTunnelSocketFactory", "doTunnelHandshake",
"doTunnelHandshake start");
OutputStream out = tunnel.getOutputStream();
//generate connection string
String msg = "CONNECT " + host + ":" + port + " HTTP/1.0\n"
+ "User-Agent: "
+ sun.net.www.protocol.http.HttpURLConnection.userAgent;
if (!tunnelUserName.equals("") && !tunnelPassword.equals(""))
{
NLUtil.ldebug("SSLTunnelSocketFactory", "doTunnelHandshake",
"Using proxy authencation with username '" + tunnelUserName + "' and
password '" + tunnelPassword + "'.");
//add basic authentication header for the proxy
sun.misc.BASE64Encoder enc = new sun.misc.BASE64Encoder();
String encodedPassword = enc.encode((tunnelUserName + ":"
+ tunnelPassword).getBytes());
msg = msg + "\nProxy-Authorization: Basic " +
encodedPassword;
}
msg = msg + "\nContent-Length: 0";
msg = msg + "\nPragma: no-cache";
msg = msg + "\r\n\r\n";
NLUtil.ldebug("SSLTunnelSocketFactory", "doTunnelHandshake", "msg:
" + msg);
byte b[];
try {
//we really do want ASCII7 as the http protocol doesnt
change with locale
b = msg.getBytes("ASCII7");
} catch (UnsupportedEncodingException ignored) {
//If ASCII7 isn't there, something is seriously wrong!
b = msg.getBytes();
}
out.write(b);
out.flush();
byte reply[] = new byte[200];
int replyLen = 0;
int newlinesSeen = 0;
boolean headerDone = false;
InputStream in = tunnel.getInputStream();
boolean error = false;
while (newlinesSeen < 2) {
int i = in.read();
if (i < 0) {
throw new IOException("Unexpected EOF from Proxy");
}
if (i == '\n') {
headerDone = true;
++newlinesSeen;
} else
if (i != '\r') {
newlinesSeen = 0;
if (!headerDone && replyLen < reply.length) {
reply[replyLen++] = (byte) i;
}
}
}
//convert byte array to string
String replyStr;
try {
replyStr = new String(reply, 0, replyLen, "ASCII7");
} catch (UnsupportedEncodingException ignored) {
replyStr = new String(reply, 0, replyLen);
}
//we check for connection established because our proxy
returns http/1.1 instead of 1.0
if (replyStr.toLowerCase().indexOf("200 connection
established") == -1) {
NLUtil.ldebug("SSLTunnelSocketFactory", "doTunnelHandshake",
"replyStr: " + replyStr);
System.err.println(replyStr);
throw new IOException("Unable to tunnel through " +
tunnelHost + ":" + tunnelPort + ". Proxy returns\"" + replyStr +
"\"");
}
//tunneling hanshake was successful
}
}
- 16
- how to map from display metrics to physical metrics...Suppose I have a screen which is 1024x768, how can I map this rectangle in
pixels into physical world dimensions in meters or in inches? Actually I
want to know the physical size of the viewable area of the monitor...
Please help me...
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| Author |
Message |
moejo
|
 Posted: 2006-2-10 0:24:00 |
Top |
java-programmer, analytical Skill for Java Development
> As an experiment, give an "experienced" developer a problem and watch
> their
> analytical and problem solving skills seriously fail him/her. This of
> course, is the general case - there may be some corner cases where this
> will
> not occur.
So how can one learn better problem solving skills? In addition to
problem solving, where can one find better algorithms to use?
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moejo
|
| Posted: 2006-2-10 0:24:00 |
Top |
java-programmer >> analytical Skill for Java Development
> As an experiment, give an "experienced" developer a problem and watch
> their
> analytical and problem solving skills seriously fail him/her. This of
> course, is the general case - there may be some corner cases where this
> will
> not occur.
So how can one learn better problem solving skills? In addition to
problem solving, where can one find better algorithms to use?
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Scott.R.Lemke@gmail.com
|
| Posted: 2006-2-10 0:38:00 |
Top |
java-programmer >> analytical Skill for Java Development
Ignore what I wrote before. Oliver found the real minimum worst case of
14, and it appears that the general solution would be x such that
Summation(x) >= upper bound, And that it is the first Summation to do
so.
IE, for 100 Sum(13) = 91, so it wont work, but Sum(14) = 104. So the
best worst case is 14 steps.
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Eric Sosman
|
| Posted: 2006-2-10 0:50:00 |
Top |
java-programmer >> analytical Skill for Java Development
moejo wrote On 02/09/06 11:23,:
>>As an experiment, give an "experienced" developer a problem and watch
>>their
>>analytical and problem solving skills seriously fail him/her. This of
>>course, is the general case - there may be some corner cases where this
>>will
>>not occur.
>
>
> So how can one learn better problem solving skills? In addition to
> problem solving, where can one find better algorithms to use?
The problem of how to solve problems is itself
solved, by Feynman's Algorithm:
Step 1: Take a piece of paper, and write down
everything you know about the problem.
Step 2: Think really hard.
Step 3: Write down the answer.
--
email***@***.com
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Dimitri Maziuk
|
| Posted: 2006-2-10 1:18:00 |
Top |
java-programmer >> analytical Skill for Java Development
Roedy Green sez:
> On Wed, 8 Feb 2006 00:42:07 -0800, "Adam Maass"
><email***@***.com> wrote, quoted or indirectly quoted
> someone who said :
>
>>2) You have many piles of rocks. The rocks in each pile are identical. There
>>are an infinite number of rocks in each pile. You know that the rocks in one
>>of the piles are slightly heavier than the rocks in all the other piles.
>>(Say 1.1 kg instead of 1 kg.) You have a scale that you may use exactly
>>once. Describe an algorithm to determine which pile contains the heavier
>>rocks.
>
> Depends what you mean by a scale.
Not really: a pile of infinite number of rocks (provided it does
not collapse on itself into a black hole as suggested upthread)
will contain all the matter in the universe and occupy all the
space.
There is neither room nor matter for a scale of any kind. Nor
for the experimenter, nor other piles.
The solution is to not try to weigh the rocks, but instead to
realise The Truth(tm).
Dima
--
We're sysadmins. Sanity happens to other people. -- Chris King
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Oliver Wong
|
| Posted: 2006-2-10 1:20:00 |
Top |
java-programmer >> analytical Skill for Java Development
"Eric Sosman" <email***@***.com> wrote in message
news:dsfrr0$iij$email***@***.com...
>
>
> moejo wrote On 02/09/06 11:23,:
>>>As an experiment, give an "experienced" developer a problem and watch
>>>their
>>>analytical and problem solving skills seriously fail him/her. This of
>>>course, is the general case - there may be some corner cases where this
>>>will
>>>not occur.
>>
>>
>> So how can one learn better problem solving skills? In addition to
>> problem solving, where can one find better algorithms to use?
>
> The problem of how to solve problems is itself
> solved, by Feynman's Algorithm:
>
> Step 1: Take a piece of paper, and write down
> everything you know about the problem.
>
> Step 2: Think really hard.
>
> Step 3: Write down the answer.
I seem to always get a Interrupted, TimeOut, NotImplemented, or
OutOfMemory exception/errors somewhere between step 2 and 3 when following
this algorithm.
- Oliver
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Oliver Wong
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| Posted: 2006-2-10 1:58:00 |
Top |
java-programmer >> analytical Skill for Java Development
"Dimitri Maziuk" <email***@***.com> wrote in message
news:email***@***.com...
> Roedy Green sez:
>> On Wed, 8 Feb 2006 00:42:07 -0800, "Adam Maass"
>><email***@***.com> wrote, quoted or indirectly quoted
>> someone who said :
>>
>>>2) You have many piles of rocks. The rocks in each pile are identical.
>>>There
>>>are an infinite number of rocks in each pile. You know that the rocks in
>>>one
>>>of the piles are slightly heavier than the rocks in all the other piles.
>>>(Say 1.1 kg instead of 1 kg.) You have a scale that you may use exactly
>>>once. Describe an algorithm to determine which pile contains the heavier
>>>rocks.
>>
>> Depends what you mean by a scale.
>
> Not really: a pile of infinite number of rocks (provided it does
> not collapse on itself into a black hole as suggested upthread)
> will contain all the matter in the universe and occupy all the
> space.
If there's an infinite number of rocks, this implies that there's an
infinite number of matter in the universe, and thus that the universe itself
is infinite.
In an infinite universe, there may exist subsets of the universe which
are themselves infinite. For example, maybe the universe is exactly composed
the union of {an infinite number of rocks} and {an infinite number of
scales}, in which case the rocks only make up "half" of the universe, but
there's still an infinite amount of them.
- Oliver
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Richard Wheeldon
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| Posted: 2006-2-10 4:17:00 |
Top |
java-programmer >> analytical Skill for Java Development
Thomas Hawtin wrote:
> Nobody wants general problem-solution-capabilities. A sane employer will
> want someone capable in a particular field. Particular APIs aren't of
> much concern, nor is the ability to play silly games.
As much as anything it's a test of intelligence. The problem is
that a lot of these tests/games are just simple variations on others.
In that situation, it just becomes yet another memory test.
>>> I would have through the probability of a ball (pair) breaking when
>>> dropped from the first given it does not drop from the ground floor
>>> is much greater than it breaking from the 100th if it did not break
>>> from the 99th. Perhaps the vast majority of balls don't break when
>>> dropped from the 100th, so the first ball should be dropped from the
>>> top first off.
Doing this means then doing a linear search through the remaining
99 floors in order - worst case O(n) drops. However it may be a
better average case answer.
> If you were doing the problem with cats, you should throw one off the
> top floor.
That's evil!
Richard
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Richard Wheeldon
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| Posted: 2006-2-10 4:19:00 |
Top |
java-programmer >> analytical Skill for Java Development
Ingo R. Homann wrote:
> No, the opposite is true: You already know from the problem
> specification that it will break somewhere between floor 1 and 100. So,
> if it does not break on the 99th floor, you can be *sure* that it must
> break on the 100th floor!
Or the specification is wrong. That would be more like a real software
project :)
Richard
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wolfgang zeidler
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| Posted: 2006-2-10 5:39:00 |
Top |
java-programmer >> analytical Skill for Java Development
Ingo R. Homann wrote:
> Hi,
>
> And I like this one:
>
> "How many points are there on the globe where by walking one mile south,
> one mile east and one mile north you reach the place where you started."
>
> Hint: The "obvious" answer ("There is one point.") is *wrong*!
>
> Ciao,
> Ingo
>
I found 3 answers and I think exactly 2 of them are correct.
1st answer, correct but useless:
number of solutions to go south-east-north in this way
*equals*
number of solutions to go north-east-south in this way
2nd + 3rd:
there is exactly one point *S* [/1/] with the following properties:
if you go 1 km north from S to A ( no matter which direction ) and
1 km east from A to B and
1 km south from B you'll reach S again.
For every distinct "S-A-B-S-circle"
the "B-S-A-B-circle" is a distinct solution of the
south-east-north-problem ( with fixed B-S-direction ).
2nd answer only:
there is a infinite number of solutions
because there is a infinite number of "S-A-B-S-circles".
3rd answer only:
there is a huge [/2/] number of solutions
because there is a huge number of "S-A-B-S-circles".
Remarks:
[/1/] the name *S* was *not* choosen because it's the *s*tarting point.
[/2/] http://en.wikipedia.org/wiki/Uncertainty_principle
regards ( from *munich*, i think you know why ), wz
--
http:\wzwz.de\mail
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steve
|
| Posted: 2006-2-10 6:52:00 |
Top |
java-programmer >> analytical Skill for Java Development
On Wed, 8 Feb 2006 16:42:07 +0800, Adam Maass wrote
(in article <email***@***.com>):
>
> "im" wrote:
>> On Wed, 08 Feb 2006 00:44:55 +0000, nospam wrote:
>>
>>> Hi...All,
>>>
>>> Recently I had been attending some interviews(almost after 10years)
>>> for Java Developer/Lead position. At each interview, 75% of the alloted
>>> time was spend was on problem solving sessions or checking the
>>> analytical skills. I was just wondering what has prompted the companies
>>> to include such a session & give so much importance to it.?
>>>
>>
>> Could you please post some examples of specific problems you had to solve
>> during the interviews?
>>
>
> 1) You have two identical glass balls; when dropped from a certain height,
> they will break. If they do not break, they are re-usable. Your task is to
> find which floor of a 100-storey building the balls will break on. Describe
> in words the algorithm you would use. We are interested in the time
> complexity of the algorithm; you should spend the majority of your time on
> this question attempting to optimize the algorithm.
>
> Hint: you can always do a linear search with one of the balls, though this a
> profoundly suboptimal solution to the problem.
>
>
> 2) You have many piles of rocks. The rocks in each pile are identical. There
> are an infinite number of rocks in each pile. You know that the rocks in one
> of the piles are slightly heavier than the rocks in all the other piles.
> (Say 1.1 kg instead of 1 kg.) You have a scale that you may use exactly
> once. Describe an algorithm to determine which pile contains the heavier
> rocks.
>
>
>
well the first one is the same as a simple binary sort. ,took just under 20
seconds to solve that one.
it's the same as having a sorted list , then finding a "break floor" directly
above a "non break floor"
the second one can be done by just taking a few rocks (same number form each
pile) adding them together then , looking at the total weight of each group
of rocks, which ever group is heavier, is the winner.
the infinite part is just shoved in there to mess you up.
that one took longer, the "infinite " threw me.
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steve
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| Posted: 2006-2-10 6:59:00 |
Top |
java-programmer >> analytical Skill for Java Development
On Wed, 8 Feb 2006 19:09:42 +0800, Ingo R. Homann wrote
(in article <43e9d134$0$336$email***@***.com>):
> Hi,
>
> Andrea Desole wrote:
>> take 1 rock from the 1st pile, 2 from the 2nd, etc. The total weight
>> should be 1+2+3+...+n kilos. If it's .1 more the rocks from the first
>> pile are heavier, if it's .2 more the rocks from the second are heavier,
>> and so on. I knew the solution :-)
>
> Yes, this is easy.
>
>> I find the first one harder; I would probably go with a binary search at
>> the beginning to do it faster, until the first ball breaks, and then I
>> would do that linearly.
>
> As I explained in another post, this was also my first idea. But this
> fails: When you throw the first ball from the 50th floor and it breaks,
> you have to do a linear search from 1 to 49. That's hard.
>
> What do you think of my ideas explained in my other posts?
>
> Ciao,
> Ingo
>
why the hell would you need a linear search?
you know the ball breaks at the 50th floor , so that discounts 51-100
now you search again and start at 25, if it does not break at 25, you know
it is between 25 & 50
so repeat.
by keeping 2 pointers
broken = top limit
un-broken = bottom limit
by splitting the list eventually you WILL run out of numbers & un-broken will
be directly under broken, a simple split sort will do it.
unless you have a bug ;-)
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Dimitri Maziuk
|
| Posted: 2006-2-10 7:09:00 |
Top |
java-programmer >> analytical Skill for Java Development
Oliver Wong sez:
>
> "Dimitri Maziuk" <email***@***.com> wrote in message
> news:email***@***.com...
>> Roedy Green sez:
>>> On Wed, 8 Feb 2006 00:42:07 -0800, "Adam Maass"
>>><email***@***.com> wrote, quoted or indirectly quoted
>>> someone who said :
>>>
>>>>2) You have many piles of rocks. The rocks in each pile are identical.
>>>>There
>>>>are an infinite number of rocks in each pile. You know that the rocks in
>>>>one
>>>>of the piles are slightly heavier than the rocks in all the other piles.
>>>>(Say 1.1 kg instead of 1 kg.) You have a scale that you may use exactly
>>>>once. Describe an algorithm to determine which pile contains the heavier
>>>>rocks.
>>>
>>> Depends what you mean by a scale.
>>
>> Not really: a pile of infinite number of rocks (provided it does
>> not collapse on itself into a black hole as suggested upthread)
>> will contain all the matter in the universe and occupy all the
>> space.
>
> If there's an infinite number of rocks, this implies that there's an
> infinite number of matter in the universe, and thus that the universe itself
> is infinite.
>
> In an infinite universe, there may exist subsets of the universe which
> are themselves infinite. For example, maybe the universe is exactly composed
> the union of {an infinite number of rocks} and {an infinite number of
> scales}, in which case the rocks only make up "half" of the universe, but
> there's still an infinite amount of them.
More accurately, of "many" {pile of an infinite number of rocks},
one {scale usable exactly once}, one or more {interviewer}, and
one {interviewee}.
Which is why the right answer is to walk out: programming job in that
universe will probably entail banging rocks to make ones and zeroes.
Dima
--
One distinguishing characteristic of BOFHen is attention deficit disorder.
Put me in front of something boring and I can find a near-infinite number
of really creative ways to bugger off. -- ADB
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Patricia Shanahan
|
| Posted: 2006-2-10 12:11:00 |
Top |
java-programmer >> analytical Skill for Java Development
steve wrote:
> On Wed, 8 Feb 2006 19:09:42 +0800, Ingo R. Homann wrote
> (in article <43e9d134$0$336$email***@***.com>):
>
>
>>Hi,
>>
>>Andrea Desole wrote:
>>
>>>take 1 rock from the 1st pile, 2 from the 2nd, etc. The total weight
>>>should be 1+2+3+...+n kilos. If it's .1 more the rocks from the first
>>>pile are heavier, if it's .2 more the rocks from the second are heavier,
>>>and so on. I knew the solution :-)
>>
>>Yes, this is easy.
>>
>>
>>>I find the first one harder; I would probably go with a binary search at
>>>the beginning to do it faster, until the first ball breaks, and then I
>>>would do that linearly.
>>
>>As I explained in another post, this was also my first idea. But this
>>fails: When you throw the first ball from the 50th floor and it breaks,
>>you have to do a linear search from 1 to 49. That's hard.
>>
>>What do you think of my ideas explained in my other posts?
>>
>>Ciao,
>>Ingo
>>
>
>
> why the hell would you need a linear search?
>
> you know the ball breaks at the 50th floor , so that discounts 51-100
>
> now you search again and start at 25, if it does not break at 25, you know
> it is between 25 & 50
Suppose instead the second ball does break at 25. We now know the
critical floor number is in the range 1-25, but with both balls broken
there is no way to do any more tests.
Once the first ball has broken, the second ball must be used in an
ascending floor number scan of the floors that have not already been
eliminated. That is the only strategy that ensures that a test that
breaks it also gives the answer. The interesting part of this problem is
working out the strategy for using the first ball, given that limitation.
Patricia
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Roedy Green
|
| Posted: 2006-2-10 12:19:00 |
Top |
java-programmer >> analytical Skill for Java Development
On Thu, 09 Feb 2006 11:49:36 -0500, Eric Sosman <email***@***.com>
wrote, quoted or indirectly quoted someone who said :
>
> The problem of how to solve problems is itself
>solved, by Feynman's Algorithm:
>
> Step 1: Take a piece of paper, and write down
> everything you know about the problem.
>
> Step 2: Think really hard.
>
> Step 3: Write down the answer.
Thee is also the bottom up approach.
1. what part of the problem do I know how to solve.
2. write a class/method to solve it.
3. rethink that problem with your new abstraction thinking tool. It
should be clearer. At least your mind is cleared of worrying about the
part you already solved.
go to 1.
You gnaw away at he problem , and lo, eventually the solution is to
glue together 3 of the pieces you have created.
See http://mindprod.com/jgloss/tackling.html for a fuller discussion.
--
Canadian Mind Products, Roedy Green.
http://mindprod.com Java custom programming, consulting and coaching.
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Roedy Green
|
| Posted: 2006-2-10 12:44:00 |
Top |
java-programmer >> analytical Skill for Java Development
On Fri, 10 Feb 2006 04:11:03 GMT, Patricia Shanahan <email***@***.com>
wrote, quoted or indirectly quoted someone who said :
>Once the first ball has broken, the second ball must be used in an
>ascending floor number scan of the floors that have not already been
>eliminated. That is the only strategy that ensures that a test that
>breaks it also gives the answer. The interesting part of this problem is
>working out the strategy for using the first ball, given that limitation.
That seems intuitively obvious, but how do you prove it? I think you
need some sort of reductio ad absurdam approach.
It also might be fun to see what happen when you turn a rules engine
e.g. Jess, loose on the problem. See
http://mindprod.com/jgloss/rules.html
--
Canadian Mind Products, Roedy Green.
http://mindprod.com Java custom programming, consulting and coaching.
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Patricia Shanahan
|
| Posted: 2006-2-10 14:30:00 |
Top |
java-programmer >> analytical Skill for Java Development
Tony Morris wrote:
> As an experiment, give an "experienced" developer a problem and watch their
> analytical and problem solving skills seriously fail him/her. This of
> course, is the general case - there may be some corner cases where this will
> not occur.
This assertion is difficult to falsify because any experienced developer
with good analytical and problem solving skills can be classed as a
corner case.
Patricia
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Thomas Hawtin
|
| Posted: 2006-2-10 15:44:00 |
Top |
java-programmer >> analytical Skill for Java Development
Patricia Shanahan wrote:
> Tony Morris wrote:
>> As an experiment, give an "experienced" developer a problem and watch
>> their
>> analytical and problem solving skills seriously fail him/her. This of
>> course, is the general case - there may be some corner cases where
>> this will
>> not occur.
>
> This assertion is difficult to falsify because any experienced developer
> with good analytical and problem solving skills can be classed as a
> corner case.
There's got to be some extroverts out there.
Tom Hawtin
--
Unemployed English Java programmer
http://jroller.com/page/tackline/
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Ingo R. Homann
|
| Posted: 2006-2-10 15:53:00 |
Top |
java-programmer >> analytical Skill for Java Development
Hi wolfgang,
wolfgang zeidler wrote:
> I found 3 answers and I think exactly 2 of them are correct.
>
> 1st answer, correct but useless:
> number of solutions to go south-east-north in this way
> *equals*
> number of solutions to go north-east-south in this way
That is correct - although you get different points of course - but the
number is the same.
> 2nd + 3rd:
> there is exactly one point *S* [/1/] with the following properties:
> if you go 1 km north from S to A ( no matter which direction ) and
> 1 km east from A to B and
> 1 km south from B you'll reach S again.
> For every distinct "S-A-B-S-circle"
> the "B-S-A-B-circle" is a distinct solution of the
> south-east-north-problem ( with fixed B-S-direction ).
>
> 2nd answer only:
> there is a infinite number of solutions
> because there is a infinite number of "S-A-B-S-circles".
>
> 3rd answer only:
> there is a huge [/2/] number of solutions
> because there is a huge number of "S-A-B-S-circles".
Eh... I do not understand what you are trying to say.
So, what is your answer to the question(s)?:
(1) How many points are there?
(2) Where is/are this/these point/s?
> regards ( from *munich*, i think you know why ), wz
Hehehe,
Regards from Bielefeld (which *does* exist)
Ingo
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Patricia Shanahan
|
| Posted: 2006-2-10 22:29:00 |
Top |
java-programmer >> analytical Skill for Java Development
Roedy Green wrote:
> On Fri, 10 Feb 2006 04:11:03 GMT, Patricia Shanahan <email***@***.com>
> wrote, quoted or indirectly quoted someone who said :
>
>
>>Once the first ball has broken, the second ball must be used in an
>>ascending floor number scan of the floors that have not already been
>>eliminated. That is the only strategy that ensures that a test that
>>breaks it also gives the answer. The interesting part of this problem is
>>working out the strategy for using the first ball, given that limitation.
>
>
> That seems intuitively obvious, but how do you prove it? I think you
> need some sort of reductio ad absurdam approach.
Yes, if I were going to prove this I would assume a different strategy
and show that it can leave a lower floor unevaluated when the ball breaks.
Patricia
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Patricia Shanahan
|
| Posted: 2006-2-10 22:42:00 |
Top |
java-programmer >> analytical Skill for Java Development
moejo wrote:
>>As an experiment, give an "experienced" developer a problem and watch
>>their
>>analytical and problem solving skills seriously fail him/her. This of
>>course, is the general case - there may be some corner cases where this
>>will
>>not occur.
>
>
> So how can one learn better problem solving skills? In addition to
> problem solving, where can one find better algorithms to use?
>
Get an algorithms textbook, and read it. Don't just look at the
algorithms in isolation. Think about how they are put together. There
are design patterns they follow. For example, binary search is an
example of divide-and-conquer.
I'm not going to recommend a book, because the last time I bought an
algorithms book it was for a course, so I had to buy the one the
professor had chosen. I didn't look at any others.
I'm also convinced that problem solving improves with practice. The more
you think about problems and puzzles, the better you will be at it.
Patricia
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Index ‹ java-programmer |
- Next
- 1
- "NullPointerException". (was Re: ArrayOutOfbounds, how come?)Mark Haase wrote:
>
> What exception, exactly?? Your subject says
> "ArrayOutOfBounds" but the catch block is
> "NullPointerException".
you got it right. it is indeed "NullPointerException".
mea culpa.
> You shouldn't be getting ArrayOutOfBoundsException, but
> your code will generate a NPE everytime because of a
> noobie mistake that you're making.
what is noobie?
> Below, you initialize a new array of JButton references,
> but each reference is still null.
>
>> button = new JButton[8][14];
>
> You need to put an object in each one of them before you
> start making calls like:
>
>
>> button[gridY1][gridX1].setText(button_text);
>
> How can you call setText on an object that doesn't exist?
> You can't. The runtime lets you know by throwing NPE.
>
> Do this:
>
> for (int i=0; i<8; i++)
> for (int j=0; j<14; j++)
> button[i][j] = new JButton();
>
> In the future, be more specific when you say "I have an
> error!! help!"..Name the exact error.
done.
no way. After changing to the following, it compiled pretty
well, but is still giving npe at = line.
-------------
JButton[][] button;
-----------------
for (int gridY1 = 0; gridY1 < d_rows; gridY1++) {
for (int gridX1 = 0; gridX1 < d_columns;
gridX1++) {
button[gridY1][gridX1] = new JButton();
}
}
-------------
when I changed the above block according to what was
suggested by Mr John in another thread of Mr Mike:
-------------
JButton[][] button = new JButton[d_rows][d_columns];
for (int gridY1 = 0; gridY1 < d_rows; gridY1++) {
for (int gridX1 = 0; gridX1 < d_columns;
gridX1++) {
button[gridY1][gridX1] = new JButton();
}
}
-------------
it again got compiled flawlessly, but I got npe at a further
line where I am refering a button for the first time:
------------
button[gridY1][gridX1].setText(button_text);
------------
what next?
-rawat
- 2
- any LWP::UserAgent equivalent in java && a java regex questionHi All
I have found Perl's LWP::UserAgent and related packages useful. Does
java have any thing
equivalent i.e. that won't make me do encoding when I want to do an
http POST? I am a newbie
to java. Also, is there anything like java CPAN ?
Also, in perl, if I do /some pattern (some other pattern)/ I get "some
other pattern" in $1. I found
out that () have different meanings in Java. The only to get $1 in
Java is to write more lines.
Thanks in advance
Z. M. Wu
- 3
- URGENT: JDeveloper : Error in Updation through ViewObjectHi
I am getting a very simple but annoying problem. I have made a
business component project in which I have created a ViewObject named
"CountryView" using table in SQL Server. Table consists only two
columns CountryId (which is primary) and CountryName.
Uptill this it is smooth But when I test CountryView using Application
I am getting error in updating a record. When I change countryName
[haven't touched countryId] and then try to move on to next record, I
get error "FOR UPDATE clause cannot be specified with READ ONLY
CURSOR".
I read some docs on net and get to know that I have to set application
module's locking mode : optimistic. I did this and I can now move on
to next record. But when I try to commit data I again get the same
error i.e. "FOR UPDATE clause cannot be specified with READ ONLY
CURSOR". I have tried it with two Drivers "Microsoft" and "DataDirect"
but it has been of no use.
I am using
RDBMS : SQL SERVER
SQL Flavor : SQL92
Made view by selecting table from database
Connection url :
jdbc:microsoft:sqlserver://localhost:1433;SelectMethod=cursor;DatabaseName=june07
You may use SelectMethod=direct. This error still comes. Strange thing
is when I try the same thing on an Oracle Server and with SQL Flavour
Oracle then it works fine.
I would like to get the answers of following Qs.
1. Why JDeveloper APIs use a "Select FOR UPDATE" query when I have
called for commit and not just moving on to next record after
updating. There must be some queries to check if the record has been
locked by someone else.
2. Am I using a wrong Driver / doing something [incorrect / foolish]
or it is just a myth that JDeveloper + ADF APIs and SQL server are
compatible using a third party Driver.
and finally i will be grateful if someone can tell me how to bypass
this.
Thanks
Nitin Goyal
- 4
- what needed for j2me
hi all, I'm starting developing stuff for siemens c55, but for starting
I'd like to know what do I need to have to develop...
I've got j2dsk1.4.2 but when I call javax it says it doesn't exist...
what do I need to have in order to get my laptop undergoing on cell
phone SW????
nuno silva
- 5
- "new" [<TypeArguments>] <ClassOrInterfaceType> "(" [<ArgumentList>] ")" According to
http://java.sun.com/docs/books/jls/third_edition/html/expressions.html#15.9
the following production holds
<ClassInstanceCreationExpression> ::=
"new" [<TypeArguments>] <ClassOrInterfaceType> "(" [<ArgumentList>] ")"
What would be an example for a class instance creation expression
with type arguments? Here's a reminder about those:
<TypeArguments> ::=
"<" <TypeArgument> {"," <TypeArgument>} ">"
What I would understand would be:
<ClassInstanceCreationExpression> ::=
"new" <ClassOrInterfaceType> [<TypeArguments>] "(" [<ArgumentList>] ")"
- 6
- Binary distro o' java (freebsdfoundation down)So I was disheartened a few weeks ago to see:
March 11, 2005 - www.FreeBSDFoundation.org temporarily unavailable due to hardware failure.
Due to a hardware failure, the FreeBSD Foundation web site is temporarily unavailable. The full site will be restored within a few days.
But I was looking forward to the site coming back up and being able to pull down some binary java packages. Alas, no-go yet. Can anyone point me to a recent binary package that will work on 4-STABLE?
-Yanek.
--
___________________________________________________________
Sign-up for Ads Free at Mail.com
http://promo.mail.com/adsfreejump.htm
- 7
- Applets on Sun site?Has anybody seen actual applets on Sun's
site recently? Got any URL's?
I went in search of them on the site recently.
I found lots of _images_ of applets,
as well as broken _links_ to applets,
their was a slew of applet _code_ and
many references to the applet _html tag_,
but I could not find a single _applet_.
- 8
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- 9
- Empty cacerts file installed by jdk-1.4.2p5 port causedThis is a multi-part message in MIME format.
------=_NextPart_000_0039_01C3BE43.75A7BFC0
Content-Type: text/plain;
charset="Windows-1252"
Content-Transfer-Encoding: quoted-printable
Hello,
I was successfully running an SSL-enabled application on the Linux =
version of JDK 1.4 on FreeBSD 4.8-STABLE, and decided to go native. When =
I built the native JDK and ran my app on it, I got the following =
exception when it attempted to open an SSL connection to a host the =
Linux JDK had never had trouble connecting to:
sun.security.validator.ValidatorException: No trusted certificate found
After some research, I tracked down the problem to the =
jre/lib/security/cacerts file installed by the jdk-1.4.2p5 port: it was =
only 32 bytes in size and contained no certificates. I copied the =
cacerts file from the Linux JDK's directory and that fixed the problem.
Is this a known issue? Or am I the only human being in the world to ever =
have this problem? I have attached the cacerts file installed by the =
port.
Please reply to the list only, for my supplied address is fake.
Thanks,
Nick
---
MSN2Go - Web-based MSN Messenger client
http://www.msn2go.com/
------=_NextPart_000_0039_01C3BE43.75A7BFC0
Content-Type: application/octet-stream;
name="cacerts.bak"
Content-Transfer-Encoding: base64
Content-Disposition: attachment;
filename="cacerts.bak"
/u3+7QAAAAIAAAAA4mhuRftD36TZkt1BzrayHGMw15I=
------=_NextPart_000_0039_01C3BE43.75A7BFC0
Content-Type: text/plain; charset="us-ascii"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Content-Disposition: inline
_______________________________________________
email***@***.com mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-java
To unsubscribe, send any mail to "email***@***.com"
------=_NextPart_000_0039_01C3BE43.75A7BFC0--
- 10
- hibernate w/derby simple crudhi-
i am really new to hibernate.
i thought it would be cool to use in my hobby.
i want to make the code that deals with the db more readable in my projects.
i hope hibernate can help me in that regard.
i am trying to add a record?
i get an error that says attempting to modify an identity column.
i didnt specify the identity column in my constructor call.
i saw how to iterate through the table (read using HQL) but am looking
for an example of create,update, delete. i am missing the example
somewhere in my book (hibernate in action).
with delete i probably just set part of a collection to null....right?
if i can get help on this identity column issue, i may be able to figure the
examples out myself.
thank you,
jim
Session session = HibernateUtil.getSessionFactory().openSession();
Transaction tx = session.beginTransaction();
Date d1 = new Date(2006-10-14);
Date d2 = new Date(2006-10-15);
Accounts accounts = new Accounts("boo",d1,d2);
session.save(accounts);
tx.commit();
session.close();
--------------------------------------------------------------------------
// pojo
package bcalcpkg;
// Generated Jan 6, 2007 1:38:27 AM by Hibernate Tools 3.2.0.beta8
import java.util.Date;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;
import javax.persistence.GeneratedValue;
/**
* Accounts generated by hbm2java
*/
@Entity
@org.hibernate.annotations.Entity(
dynamicInsert = true, dynamicUpdate = true)
@Table(name = "ACCOUNTS", schema = "USER1", uniqueConstraints = {})
public class Accounts implements java.io.Serializable {
// Fields
@Id @GeneratedValue
@Column(name = "ACCOUNTID")
private int accountid;
@Column(name = "ACCOUNTNAME")
private String accountname;
@Column(name = "ACCOUNTOPEN")
private Date accountopen;
@Column(name = "ACCOUNTCLOSE")
private Date accountclose;
// Constructors
/** default constructor */
public Accounts() {
}
/** minimal constructor */
public Accounts(int accountid, String accountname, Date accountopen) {
this.accountid = accountid;
this.accountname = accountname;
this.accountopen = accountopen;
}
/** full constructor */
public Accounts( String accountname, Date accountopen,
Date accountclose) {
//this.accountid = accountid;
this.accountname = accountname;
this.accountopen = accountopen;
this.accountclose = accountclose;
}
//public Accounts(String text) {
//this.text = text;
//}
// Property accessors
@Id
@Column(name = "ACCOUNTID", unique = true, nullable = false, insertable =
true, updatable = true)
public int getAccountid() {
return this.accountid;
}
public void setAccountid(int accountid) {
this.accountid = accountid;
}
@Column(name = "ACCOUNTNAME", unique = false, nullable = true, insertable =
true, updatable = true, length = 50)
public String getAccountname() {
return this.accountname;
}
public void setAccountname(String accountname) {
this.accountname = accountname;
}
@Temporal(TemporalType.DATE)
@Column(name = "ACCOUNTOPEN", unique = false, nullable = true, insertable =
true, updatable = true, length = 10)
public Date getAccountopen() {
return this.accountopen;
}
public void setAccountopen(Date accountopen) {
this.accountopen = accountopen;
}
@Temporal(TemporalType.DATE)
@Column(name = "ACCOUNTCLOSE", unique = false, nullable = true, insertable
= true, updatable = true, length = 10)
public Date getAccountclose() {
return this.accountclose;
}
public void setAccountclose(Date accountclose) {
this.accountclose = accountclose;
}
}
- 11
- Cloning JDBC connection?In a JDBC appllication I want to create a second connection, which I
can run some queries while some longer queries hang on the primary
connection. Surprisingly, I fail to see an easy way to create a second
connection. The matter is as simple as getting user, pwd and url, but
how to get those? The Connection interface doesn't have this info; the
implementation class oracle.jdbc.driver.T4CConnection has it. It is a
hidden class, however. DatabaseMetadata has everything but pwd.
- 12
- Regex for finding a '?' in a StringIm trying to write a routine to replace the '?' in a String with values
supplied by the client.
ie
String myString = "Hello there, my first name is ? and my surname is
?";
String myRegex = "<a regex>";
myString = myString.replaceFirst(myRegex, "David");
myString = myString.replaceFirst(myRegex, "Bevan");
System.out.println(mString);
Required output is "Hello there, my first name is David and my surname
is Bevan"
What do i need as myRegex?
Many thanks
David Bevan
http://www.davidbevan.co.uk
- 13
- Creating Object With Methods During RuntimeHello All,
Is there a way to have a method create and name an object?
If my question is not clear, what I mean is instead of this:
...
Person abc = new Person();
...
where the programmer specifies the name of the object and where in the
program it is created, you have a method something like this:
...
//the string that is passed to this method is generated by another
//function which generates random strings - in other words, neither
//the programmer nor the user are involved in this step directly
private void createObject(String s)
{
Person s = new Person();
}
...
This might be used in a GUI simulation that is modeling the interaction
of different species in an ecosystem, for example. At some point the
user may wish to increase the complexity of the sim by adding more
creatures of one type or another. They could press a button which would
call the createObject function and insert another animal into the fray.
I hope that is enough to sufficiently explain what I am asking, in any case.
By the way, just in case you are wondering, I have not tested the
example function above (I know it won't work as is). Normally I would
try myself before asking here, but I don't have access to my PC right
now and I can't find what I'm looking for on the internet.
Thanks very much to any who can help.
A
- 14
- UIDefaults.getUI() failed for JInternalFrame$JDesktopIconI am using a particular Look and Feel, and a class derived from
JInternalFrame. Whenever the JInternalFrame class is invoked, it generated
an exception (please see stack trace at the bottom of this message).
I know that to correct this exception, I must do something along the lines
of the following:
UIManager.put(XXX, YYY);// Where XXX is the String used to identify the
JInternalFrame$JDesktopIcon's UIand YYY the ui class for it.
However, I do not know how to go about discerning the values for XXX and
YYY. How can I find those out? I have tried:
UIManager.getLookAndFeelDefaults().put("ClassLoader",
getClass().getClassLoader());
UIManager.put("JDesktopIcon",
javax.swing.JInternalFrame.JDesktopIcon.class.getName());
UIManager.put("JInternalFrame",
javax.swing.JInternalFrame.class.getName());
updateUI();
With no luck at al. Can someone please help me to find out what parameters I
need to pass here? Thanks, Ike
--------stack trace-----------------------
UIDefaults.getUI() failed: no ComponentUI class for:
javax.swing.JInternalFrame$JDesktopIcon[,0,0,0x0,invalid,hidden,alignmentX=0
.0,alignmentY=0.0,border=,flags=0,maximumSize=,minimumSize=,preferredSize=]
java.lang.Error
at javax.swing.UIDefaults.getUIError(Unknown Source)
at javax.swing.MultiUIDefaults.getUIError(Unknown Source)
at javax.swing.UIDefaults.getUI(Unknown Source)
at javax.swing.UIManager.getUI(Unknown Source)
at javax.swing.JInternalFrame$JDesktopIcon.updateUI(Unknown Source)
at javax.swing.JInternalFrame$JDesktopIcon.<init>(Unknown Source)
at javax.swing.JInternalFrame.<init>(Unknown Source)
at RalphVince.Controls.JScrollableDesktopPane.BaseInternalFrame.<init>()
- 15
- X3D and Java3DDoes anyone know if there are debs for X3D and Java3D that will work
with Sarge? It seems that X3D depends on Java3D. I have the X3D jar
but would prefer if possible to have a deb. I can't find either for
Java3D and Sarge, the jars seem to be all for Woody. I know I'll need
the nVidia drivers for my TNT2 card for this to work, but I think I can
get those (if I can figure out which of the legacy drivers will work).
I have the Sun 1.5 jre and sdk.
Thanks!
--
Blessings
Wulfmann
Wulf Credo:
Respect the elders. Teach the young. Co-operate with the pack.
Play when you can. Hunt when you must. Rest in between.
Share your affections. Voice your opinion. Leave your Mark.
--
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