AppletTalk.com Java discussions newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Parallel Port Access Goto page 1, 2, 3 ... 59, 60, 61  Next          AppletTalk.com Forum Index -> Java Help View previous topic :: View next topic   Author Message server Guest Posted: Sat Feb 11, 2006 11:25 am    Post subject: Parallel Port Access message unavailable Back to top Roedy Green Guest Posted: Sat Feb 11, 2006 11:25 am    Post subject: Re: Parallel Port Access On 10 Feb 2006 19:44:54 -0800, david.brown.0 (AT) gmail (DOT) com wrote, quoted or indirectly quoted someone who said : Quote: I need to be able to write to the data and control pins and read the status pins. Any Java people know a good solution? there are some third party libraries . See http://mindprod.com/jgloss/serialport.html -- Canadian Mind Products, Roedy Green. http://mindprod.com Java custom programming, consulting and coaching. Back to top Ian Mills Guest Posted: Sat Feb 11, 2006 2:13 pm    Post subject: Re: dynamic array/ arrylist of arraylists standshik wrote: Quote: okay i'm new to java. i need to read some stuff from a file and store into some data structure. say i have the following in a file A B C D E F G H I no i need to store such a way so that i can access (i,j)th element at anypoint of time. i can do that very easily in C++ using vector of vectors of string. how do i do that in java? i tried using arraylist of arraylists but could not get it right? Can you somebody please explain in details how can i do that? possibly with a small fragmant of code? thanks kaushik I know this is thought to be somewhat old fashioned but if you are used to using a Vector of Vectors you can use the same in java. However it really depends on how you want to utilise this data as to the best way to store it within your application. Back to top phillip.s.powell@gmail.co Guest Posted: Sat Feb 11, 2006 2:40 pm    Post subject: Re: ServletException I do not understand I solved it, but the solution is utterly weird. I just needed to add this: /** * Does nothing * * @ignore */ public static void main(String[] args) {} I usually only added a blank main() static method to allow for my Javadocs to align a bit more nicely but it seems to have a bit more merit than I thought.. Phil Back to top phillip.s.powell@gmail.co Guest Posted: Sat Feb 11, 2006 2:58 pm    Post subject: Re: ServletException I do not understand I got it! And I have no explanation for it but it works! I added this to MessageProcessor class, but I only did this to clean up the generated Javadocs: /** * Does nothing * * @ignore */ public static void main(String[] args) {} And suddenly the ServletException is gone and all compiles nicely! Phil Back to top Bigval Guest Posted: Sat Feb 11, 2006 5:54 pm    Post subject: Re: Array info This is how the combobox is populated by default, after using a GUI builder: String []dataMoboCombo = { "Mobo1", "Mobo2", "Mobo3", "Mobo4", "Mobo5", "Mobo6" }; cmbMoboCombo = new JComboBox( dataMoboCombo ); with the combobox i am working on i do this: String []cpuComboBox = new String [cpuList.length]; for (int i = 0; i < cpuList.length; i++){ cpuComboBox[i] = cpuList[i].getName(); } The objects of type cpu have a string component (name), and a series of booleans. All i want to extract is the name Strings. I dont know why it wont work. My getName method in cpu is this: public String getName(){ return name; } I have written a toString method: public String toString(){ return getName(): } It still wont work, as it stands, the combobox is being populated with nothing :S as opposed to the mem addresses. Is it possible that as cpu is a superclass of Intel and Amd, and these 2 subclasses have more fields (more booleans) it is causing trouble? a cpu object is declared thus: Cpu cpu1 = new Amd( "cpu1", false, true, true, false, false, false, 3000); Cpu cpu2 = new Intel( "cpu2", true, false, true, false, false, 4000); John Back to top Rhino Guest Posted: Sat Feb 11, 2006 8:01 pm    Post subject: Re: Does any one use blueJ <sheldon.sc (AT) gmail (DOT) com> wrote in message news:1139604211.489490.63350 (AT) g44g2000cwa (DOT) googlegroups.com... Quote: Does any one use Blue J Ive jsut started working on it Im doing this course from a book caleed object of java I need some help with some prgrams I hope somebodys there who can help me out I really dont know how to post this ova here So let me know caus I need to submit these assnmts on sunday http://www.ucfv.bc.ca/cis/comp155/labs/lab01.htm U will find a description of the assnmt on ht elink above Its realy simple but I cant seem to figure out the method to get a Random Color <rant> Please tell me that you are just learning English; I really don't want to believe that a Canadian University student with English as a first language could write as badly as you have. What you said/what you meant to say: Quote: Does any one use Blue J Does anyone here use BlueJ? Quote: Ive jsut started working on it I've just started working on it. Quote: Im doing this course from a book caleed object of java I'm doing this course from a book called Object of Java. [maybe you mean "Objects in Java"??] Quote: I need some help with some prgrams I need some help with some programs. Quote: I hope somebodys there who can help me out I hope somebody here can help me out. Quote: I really dont know how to post this ova here I really don't know how to post here. Quote: So let me know caus I need to submit these assnmts on sunday So let me know because I need to submit these assignments on Sunday. Quote: http://www.ucfv.bc.ca/cis/comp155/labs/lab01.htm U will find a description of the assnmt on ht elink above You will find a description of the assignment at the link above. Quote: Its realy simple but I cant seem to figure out the method to get a Random Color It's really simple but I can't seem to figure out the method to get a random Color. I hope you don't plan to send out resumes written with such little care; you'll never get a job if you do, even in IT. Good communication skills are vital in any job. By the way, let me emphasize that I take back everything - except the preceding paragraph - if you are new to English. I know English is a very difficult language for non-English speakers and if you're just starting to learn it, you're off to a reasonable start. Keep working at it and you'll be fine before too long. But if you have lived your whole life in this country, your teachers and the politicians who run your school system should all be deeply ashamed for having done such a poor job of teaching you the dominant language in this country. If this counts as mastery of English these days, our educational system - and the country in general - is in deep trouble. </rant> -- Rhino Back to top zero Guest Posted: Sat Feb 11, 2006 11:54 pm    Post subject: Re: dynamic array/ arrylist of arraylists "standshik" <standshik (AT) yahoo (DOT) com> wrote in news:1139632658.336362.68390 @g44g2000cwa.googlegroups.com: Quote: okay i'm new to java. i need to read some stuff from a file and store into some data structure. say i have the following in a file A B C D E F G H I no i need to store such a way so that i can access (i,j)th element at anypoint of time. i can do that very easily in C++ using vector of vectors of string. how do i do that in java? i tried using arraylist of arraylists but could not get it right? Can you somebody please explain in details how can i do that? possibly with a small fragmant of code? thanks kaushik A Vector of Vectors would work, and is in fact very similar to an ArrayList of ArrayLists. The only differences are that a Vector is synchronized, and does not allow null values. Example code: ArrayList stuff = new ArrayList(); ArrayList row1 = new ArrayList(); row1.add("A"); row1.add("B"); row1.add("C"); ArrayList row2 = new ArrayList(); // ... ArrayList row3 = new ArrayList(); // ... stuff.add(row1); stuff.add(row2); stuff.add(row3); // element will be set to "A" String element = (String)((ArrayList)stuff.get(0)).get(0); Note that the casts can make the code harder to read. If you are using JDK 1.5 or above, you can avoid that by using generics: ArrayList<ArrayList<String>> stuff = new ArrayList<ArrayList<String>>(); ArrayList<String> row1 = new ArrayList<String>(); row1.add("A"); row1.add("B"); row1.add("C"); ArrayList<String> row2 = new ArrayList<String>(); // ... ArrayList<String> row3 = new ArrayList<String>(); // ... stuff.add(row1); stuff.add(row2); stuff.add(row3); // element will be set to "A" // no casts needed String element = stuff.get(0).get(0); The syntax is similar to the C++ templates syntax, but under the hood it's very different. You should read a tutorial on generics before using it more extensively than the code above. Back to top Guest Posted: Sun Feb 12, 2006 12:38 am    Post subject: Re: Does any one use blueJ Thanks for the English course, I do appreciate it but that is not the reason why I had written in the first place. I was in a hurry because I had to leave to go meet a friend to help me with the assignment. Some of it was not intentional but thanks for pointing it out. May be you should have become a English teacher. You did not help at all. May be it's because of you that this country is such a beautiful place. Keep up the good work. Back to top Rhino Guest Posted: Sun Feb 12, 2006 12:38 am    Post subject: Re: Does any one use blueJ <sheldon.sc (AT) gmail (DOT) com> wrote in message news:1139687623.399593.263060 (AT) g44g2000cwa (DOT) googlegroups.com... Quote: Thanks for the English course, I do appreciate it but that is not the reason why I had written in the first place. I was in a hurry because I had to leave to go meet a friend to help me with the assignment. Some of it was not intentional but thanks for pointing it out. May be you should have become a English teacher. You did not help at all. May be it's because of you that this country is such a beautiful place. Keep up the good work. You're welcome. Considering your snotty attitude, you probably won't believe this but I was really just trying to encourage you to communicate in proper, correctly spelled sentences using capitalization and punctuation so that we would have a better chance of understanding your question. The sort of mangled English you put in your initial post was a complete turnoff to me and probably to some others. I just wanted you to understand that it is discourteous to your readers to write in such a sloppy way if you know better. Some people will refuse to read writing that is that bad even if they would normally be willing to help you. We all make allowances for people that are new to English but it's sheer laziness on your part to write mangled English when you can do better. I don't normally bother to help anyone who is that lazy. As for generating a random Color, you were on the right track with your code: choosing an integer between 0 and 255 for each of the three colour components, Red, Green, and Blue sounds like a good approach to me. If you look at the API for the Color class, you will see that there are a variety of constructors for Color. One of the most commonly-used ones, the sixth of the constructors in the Java 1.5.0_06 API, calls for three integers to be passed to the constructor. Therefore: Color myBlack = new Color(0, 0, 0); Color myWhite = new Color(255, 255, 255); Color myRed = new Color(255, 0, 0); Color myBlue = new Color(0, 255, 0); Color myGreen = new Color(0, 0, 255); You just need to put an expression that generates a random integer between 0 and 255 in each of the three parameters to the Color constructor. Something like: Color myColor = new Color(<expression to calculate random int>, <expression to calculate random int>, <expression to calculate random int>); Naturally, the text I put within angle brackets needs to get replaced by real code. I'm not going to tell you the code; you'll learn more by working it out on your own. If you don't see how to do it, try looking at the Random class. The API may tell you enough that you can code it yourself but, if not, use a Google Groups search to find examples of the Random class in the comp.lang.java.* newsgroups. Once you have constructor your new random Color, you simply have to use it. For example, if you are drawing an oval and want it to be your new Color, you'll need code like this (assuming you have already defined the random Color): g.setColor(myColor); g.drawOval(90, 60, 20, 20); In other words, you have to set the color that the drawing method is supposed to use, then draw the object(s) that you want drawn in that color. That should be all you need to know to solve the problem you were having. By the way, your problem really has nothing to do with BlueJ; it's really just a Java question. If you post here again at some point, try to choose a subject line that is more appropriate. For instance, a better title for this post would have been something like "Need help generating random Color". I almost didn't read your post at all because it looked like a BlueJ question and I don't know much about BlueJ. -- Rhino Back to top IchBin Guest Posted: Sun Feb 12, 2006 12:38 am    Post subject: Re: Array info Bigval wrote: Quote: This is how the combobox is populated by default, after using a GUI builder: String []dataMoboCombo = { "Mobo1", "Mobo2", "Mobo3", "Mobo4", "Mobo5", "Mobo6" }; cmbMoboCombo = new JComboBox( dataMoboCombo ); with the combobox i am working on i do this: String []cpuComboBox = new String [cpuList.length]; for (int i = 0; i < cpuList.length; i++){ cpuComboBox[i] = cpuList[i].getName(); } The objects of type cpu have a string component (name), and a series of booleans. All i want to extract is the name Strings. I dont know why it wont work. My getName method in cpu is this: public String getName(){ return name; } I have written a toString method: public String toString(){ return getName(): } It still wont work, as it stands, the combobox is being populated with nothing :S as opposed to the mem addresses. Is it possible that as cpu is a superclass of Intel and Amd, and these 2 subclasses have more fields (more booleans) it is causing trouble? a cpu object is declared thus: Cpu cpu1 = new Amd( "cpu1", false, true, true, false, false, false, 3000); Cpu cpu2 = new Intel( "cpu2", true, false, true, false, false, 4000); John For me, just post the code that you are have a problem with. That is, the methods and all required references. I still do not know what type cpuList and cpu1, cpu2 and cpu3 are yet. I can work from your code to resolve problem unless someone else has the answer. -- Thanks in Advance... IchBin, Pocono Lake, Pa, USA http://weconsultants.servebeer.com/JHackerAppManager __________________________________________________________________________ 'If there is one, Knowledge is the "Fountain of Youth"' -William E. Taylor, Regular Guy (1952-) Back to top Guest Posted: Sun Feb 12, 2006 3:35 am    Post subject: Re: Parallel Port Access RXTX was the only thing that had any form of parallel port access, but as far as I can see, its just a native library without a Java side implementation. I've done some more searching and found a lot that can access the serial port, but not the parallel port. I'm trying to drive an LCD display, so I cannot use the serial port short of buying a BasicStamp, which is well out of reasonable price range. Java people keep trying to find something. C++ people, help me build a working parallel port library, in case I can't find anything. Back to top Roedy Green Guest Posted: Sun Feb 12, 2006 5:35 am    Post subject: Re: Does any one use blueJ On 11 Feb 2006 11:53:43 -0800, sheldon.sc (AT) gmail (DOT) com wrote, quoted or indirectly quoted someone who said : Quote: May be you should have become a English teacher. It is irritating, like deliberately mumbling. You write once, and many read, so it makes sense for you to put in some effort to make your post comprehensible. It says between the lines, "You are not important. My time is valuable. Yours is not, so serve me you worm." No wonder you get some backs up. It is more than about spelling. -- Canadian Mind Products, Roedy Green. http://mindprod.com Java custom programming, consulting and coaching. Back to top Guest Posted: Sun Feb 12, 2006 12:12 pm    Post subject: Re: Creating Jar files Thanks very much That helped a lot Cheers Andrew Back to top Bigval Guest Posted: Sun Feb 12, 2006 12:12 pm    Post subject: Re: Array info Of course, will post some code later: cpuList is an array of type Cpu cpu1-3 are Cpu objects Cpu(String name, boolean intel, boolean amd, String clockSpeed) this is a superclass of Intel and Amd (which contain similar params, plus a load of booleans representing the relevent socket types for each manufacturer). 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