Java Forum

Does anyone know how I can fetch a trigger/break signal via the serial-port? I have a circuit that connects two pins on the serial-port when the sensor is activated (when a person stands infront of the photocell). How can I get this to interact with my Java code? Or is there a better alternative then the com-port? I want a piece of...

Hi, I have a question. Let's say I want to make a simple java program where the first argument passed to the java program is doubled and returned. I.e the reult of doing: java Double 5 - would return 10. This is turning out to be really hard as I have no idea how to "access" this argument in java. If someone could help me out that...

Hi, We all know that Java has classes but how about basic storage objects like structs? C and C++ have Structs, Pascal has Records, Visual Basic has Types etc. How about Java? Greetings, Rick

suppose there're three String a, b and c, the length are not fixed. how can i make the format a b c so that three arrays align to the left? ok, i know it's stupid.. but i don't think using StringTokenizer to implement my own format is a good idea... plez help me out, thanks a lot!

Does anyone can help with this? For our goose game, we have to create the game board in a spiral. It may be a square instead of an oval or circle. Does anyone know a simple formula to do this with a variable amount of fields? I already created a table of fields (every field is an object of the type JLabel). Tnx in advance!

We have a Java Swing position. Need consultants ASAP. Position : Java Swing XML / SOAP - FX / Brokerage Requirements : Swing - JTrees / Jtables. other swing classes. etc. Java/ J2EE. JDK 1.2-1.4 XML / XSL/ XSLT Duration : 6+ months

Hi, I'm having a little problem with the string tokenizer. For example, I got this data string : "0#0#0#0####0#0#0#.. and so on....." How obvious, the # char will be the delimiter. But as you can see, at some points there are two or more brackets pasted together. I want to let the program return an empty string but the tokenizer just...

Hi, I'm looking for a tool that converts a jar into an executable program (or something like that). I guess there are a couple of options: 1) Convert the jar into a real executable that runs natively on the operating system (or similar) 2) Pack a jar file and JRE into one file, and make it look like an executable file (or similar) 3) any...

I have created a programming site available at http://blackfrog.pagemac.com. The main resource though is the forums at http://blackfrog.pagemac.com/forums/. It has both programming and community boards. Please stop by and just say hi and check out the boards. Also, I am available at the board if you have any programming related questions....

I have a java (2.0) program with the following lines: String cmdArray1 = {"lp", "-d", "hp4m", "MyFile"}; System.out.println(Runtime.getRuntime().exec(cmdArray1)); It compliles properly, but does not print the file to the printer. It displays the following as the return from Runtime...: java.lang.UNIXProcess@1034bb5

i posted this on comp.databases.db2, but no response. so, i ask from the other side. i've been posted to a project where there have been attempts to store class files in db2. i'm told that this didn't work. no mention of what "didn't work" meant, but i assume that the retrieved class file wouldn't execute. the server is WebSphere 5 on...

Is there a ready to use layer for playing up a QickTime-file? I'd hate to write it on my own. -- Kindly Konrad --------------------------------------------------- May all spammers die an agonizing death; have no burial places;

I've been using Runtime.exec() like this: Runtime rt = Runtime.getRuntime(); try {Process p = rt.exec("MyCommand.bat");} catch (Exception e) {do stuff} When I start my Java classes, I start them with a batch file that changes to my apps home directory. I've tried exec() with a full pathname (which seems to have problems on Windows if it...

Comment faire dialoguer 2 applets présentes dans 2 frames différentes d'une page web.

I am very new to Java. How would you go about making Java program that reads in a fixed length text file and pass the data into a table in an sql table? The text file data looks something like this: 123456John Smith Acme Boxes Inc 100 Someplace Drive 222222Sarah E. ConnorCyberdyne Systems Corp 1 Connorsbane Plaza...

Ok, I'm ready to toss this thing across the room. Here's what I'm trying to accomplish, greatly simplified: I have a screen with several text fields. I want to validate the entry in each text field when the user tabs out of it to the next one (some fields are required). If they enter an invalid entry or leave it blank, I want to display...

Hello, I am creating a application with Batik and I have the following problem. I am buidling a DOM Tree and I want to know the bounding box of the text-Elements while I am building the DOM. I need that information, because I want to create a fitting rect as a background for every Text-Element and for other layout-reasons. Can someone...

Hi all, I've basic knowledge of TAPI and made couple of applications. But as far as JTAPI is concerned, I cannot understand any thing out of it. As to what is this 'Implementation', JTAPI itself cannot make a phone call, What hardware are we talking abt, I know like avaya does give the CT-Connect and ctcserver.jar, is this is called an...

Does anyone know how to go from a WSDL2Java generated class to an XML string of XML document. I know that there is some serialization here but I don't know what classes to call to do the serialization. Can anyone help? Thanks _someGenClass someClass = new _someGenClass(); // do I use this function or is there some XML serialize class...

how well is javac from sun's jdk tools optimized? wow, that's a general question... so i guess here is a simple example... let's say i have a program that uses an array. and many times in the program i need to do computation that rely on the array's length. so, how much speedup (if any at all) is there to storing the array length as an...

Hi, Call me stupid but where can I find the messagebox in Java?? Or do I have to create one myself? What I need is a simple function just like Alert( "I'm annoying!" ); in JavaScript. Greetings, Rick

Hello, I need to show the following language is NOT context-free, using the pumping lemma for context-free languages. L = {wwdouble(w) | w is an element of {a,b}*}, where double(w) is derived from w by doubling each symbol, e.g. for w = aba, double(w) = aabbaa.

I am very new to Java. How would you go about making Java program that reads in a fixed length text file (myfile.txt) and pass the data into a table in an sql table? The text file data looks something like this: 123456John Smith Acme Boxes Inc 100 Someplace Drive 222222Sarah E. ConnorCyberdyne Systems Corp 1 Connorsbane...

Hi, I have a small program to test the ActionListener, but it gives errors. Here's part of the code: class ButtonListener implements ActionListener { public void actionPerformed(ActionEvent e) { ....

Hi to all. I have an object 'o1' whose constructor is o1(String arrayOfStrings) { ... } and an ArrayList 'list' of object String: