Java Forum

Hi All, I am having a problem that my PC (running windows XP) is choosing to run JRE stored in c:\Program Files\Java etc rather than the one in c:\j2sdk1.4.1_04\. How do I change this situation? I tried changing the java plug in options in the control panel but this does seem to have worked! Adam

Just wondering if anyone had a good source of information for creating custom events and their handlers. I've hunted up and down google/sun but haven't found anything significant. Much thanks in advance!

I have a directory with a lot of jpg files. I want to delete the small ones. Small means less than 100 pixels by 100 pixels. I use File.list() to get the list of files. I use ImageIcon(filename) to create an ImageIcon. I use getIconHeight() and getIconWidth(). then I try to delete the file if it meets the "small" test. I tried to use...

Hi All, I want to take an image maybe in a jpeg or gif format or rgb and convert it to a series of CMYK images (one for each colour). If there an easy way using the API of java 2, or JAI. If not does anybody no an algorithm I can use to implement this conversion. Cheers, Adam

hi i recently had a conversation with someone who said that an advantage of C# over Java is that C# uses JIT. now, i have a very simple understanding of what JIT is, and thus didn't know if this is true/false, and if it is indeed true, then why is Java not using JIT? Is it purely due to the "age" of Java, i.e. we now know that JIT is the...

I have a sql resultset called columns. When I convert an integer column to string that is a NULL it converts to zero. How can I get it to convert to null?? String x; x = Integer.toString(columns.getInt("Integercolumnname")); if x is null it will be converted to '0'. I want it converted to null.

Hello, I have some java classes. But, I don't want my users to type "java my_java_program" every time they run the java class ? How do I pack them together into one executable file, like myprogram.exe. ? Any tools can do this for me ?? Thanks & regards, June

Hello: I have just downloaded and installed JRE and SDK 1.4.2_01 onto my system. According to the book I'm reading, javaw app ( where app is the name of the class I created ) is supposed to bring up a "windowed application". This is not what happens. I get a dos prompt back from the dos window I type the command in but nothing else. The...

wasn't sure i should put this here or in comp.lang.java.misc (or even comp.lang.misc) but I was wondering what is the consensus for line length for java code? i always thought 80 chars/line was proper, since it handles printing to a printer so well. however, i find myself having to break up lines of code a bit too much with that number. ...

Can anyone please tell me what is canonical path? and why does it need to throws IOexception? how come getAbsolutePath() doesn't return "c:\folder\folder" but getCanonicalPath() does? things I tried using java.io.File file.getName(); // return "." file.getAbsolutePath(); // return "." file.getCanonicalPath(); // return "c:\folder\folder" ...

I'm creating a routine (not in a browser) to move multiple files on a daily basis to a backup directory. It can be done easily by call shell functions like 'mv file* newdir'. I can't find any reference in the Java tutorial about accessing or using the shell or system other than standard i/o. Does anyone have a clue on how to pass a command...

I am trying to draw a rectangle onto a pane. My program will compile and run but the rectangle does not seem to get drawn. When the program is run the program frame opens up, but I cannot see a rectangle on the pane. Any help would be appreciated. Sincerely, Allan

Hello Everybody! I am working on a program which renders its GUI using swing components. The program does some bath processing (some lengthy matematical calculations) when user submit a task using a command button. but when that task is submitted the GUI stops responding to events. I want to provide the option of interrupting the processing...

I have a program that builds screens dynamically by getting all form information from a database including size, position, and variable names. I was wondering how I convert the names from a String in the database to a variable name to be used in a declaration such as JLabel <database String name> = new JLabel(); Any help is greatly...

Ok I have a class called WordPlayer and in this class I have 2 methods setTray // sets the player Tray with to its parameter. getTray // it gets the player Tray of Tiles and the tray implements a stack how do I get a tile on the player tray I attached the WordPlayer class is this enough info.

Hi all, I know that under Unix/Linux, there is a max number synchronization objects (semaphores etc.) that one can create. I assume that likewise, there is a max number of mutexes and conditional vars that one can create under a threading environment such as when using Pthreads under Solaris. Now, each java object provides the Monitor...

if I want to create a NameList where it only hold names... is there a good way to write the pushGirl(Object obj) and pushGuy(Object obj)? here's how I want to use it... PeopleList people = new PeopleList(); people.pushGuy("John"); people.puthGirl("Marry"); so, for example, do I write it like this? public void pushGuy(Object obj) {

At the moment, I know virtually nothing about programming JCode and this is not a good time to try to learn. But, I do have a JCode requirement and am wondering if someone would like to tackle what I suspect is only 20 or so lines of code... Palmgear.com (a purveyor of application software for Palm OS devices) offers a "dynamic...

I have a class extending Vector, but I want it to extend another base class that contains variables. Can I implement some interfaces to do the same thing? The following from the Vector API makes me think I'm out of luck: public class Vector extends AbstractList implements List, Cloneable, Serializable

What are your favorite Java magazines?

I am getting the following exception when accessing one of my tables. java.lang.reflect.InvocationTargetException: java.lang.ArrayIndexOutOfBoundsException at oracle.sql.NUMBER._fromLnxFmt(NUMBER.java:3181) at oracle.sql.NUMBER.toBigDecimal(NUMBER.java:636) at oracle.jdbc.dbaccess.DBConversion.NumberBytesToBigDecimal(DBConversio...

Hi With JPDA (Java Platform Debugging Architecture), is it possible to redirect System.out statements from the remote VM to the debugger client application, and if yes, how do I do it? - Dan

Hi Is there any difference between JDK and J2SE? What is standard name of Java distribution - JDK or J2SE? Also when we say JDK 1.3, Does it mean JDK 1.3.x or a specific version say JDK1.3.1_07? thanks,

Hi All!, Does anyone know a link to a website or know the best way to create a data structure that will pick random elements from itself with assigned probabilities? For example, say I created a bag of 3 marbles(red, green, and blue) and the red marble had a 50% change of being picked while the green and blue marbles both had 25% chance...

Hi Is there a way to copy the stack trace in a string, which is obtained via printStackTrace function of Exception object. Essentially I want to log the stack trace in case of any exception in a log file. thanks, Naresh