AppletTalk.com Java discussions newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Passing Unknown Number of Varaibles          AppletTalk.com Forum Index -> Java Help View previous topic :: View next topic   Author Message dimo414 Guest Posted: Tue Nov 14, 2006 6:24 am    Post subject: Passing Unknown Number of Varaibles I have two methods, let's call them apple and orange. apple's signature is: public String apple(int...args) orange's signature is: public Int orange((int...args) What I'm trying to do is get apple to call orange, with the same parameters. Something like: Public String apple(int...args) { /* * Process the apple arguments */ orange(args[1], args[2], args[n]); } The problem is, I don't have the ability to change orange's functionality or signature, and I need to do it this way (trust me, I've tried others). Is there some syntax or methodology to pass an unknown number of variables to orange? Back to top Knute Johnson Guest Posted: Tue Nov 14, 2006 8:09 am    Post subject: Re: Passing Unknown Number of Varaibles dimo414 wrote: Quote: I have two methods, let's call them apple and orange. apple's signature is: public String apple(int...args) orange's signature is: public Int orange((int...args) What I'm trying to do is get apple to call orange, with the same parameters. Something like: Public String apple(int...args) { /* * Process the apple arguments */ orange(args[1], args[2], args[n]); } The problem is, I don't have the ability to change orange's functionality or signature, and I need to do it this way (trust me, I've tried others). Is there some syntax or methodology to pass an unknown number of variables to orange? public class test11 { public static void main(String[] args) { apple(1,2,3); } public static void orange(int... args) { for (int i : args) System.out.println(i); } public static void apple(int... args) { // do something orange(args); } } -- Knute Johnson email s/nospam/knute/ Back to top Andrew Thompson Guest Posted: Tue Nov 14, 2006 8:09 am    Post subject: Re: Passing Unknown Number of Varaibles dimo414 wrote: Quote: I have two methods, let's call them apple and orange. Or let's not (is another alternative). The problem with such abstractions is that often the poster is assuming the method names (and ultimate meanings and use) is not relevant, whereas it often is. Quote: apple's signature is: public String apple(int...args) orange's signature is: public Int orange((int...args) What I'm trying to do is get apple to call orange, with the same parameters. Something like: Public String apple(int...args) { /* * Process the apple arguments */ orange(args[1], args[2], args[n]); } The problem is, I don't have the ability to change orange's functionality or signature, and I need to do it this way (trust me, I've tried others). Again, given you have not yet solved the problem, it is difficult to 'trust you'. Care to share the details, so we can make suggestions that amount to more than ..guessing? Quote: ..Is there some syntax or methodology to pass an unknown number of variables to orange? orange(Object[] array) orange(Vector elements) ...however, I do not think that is the real problem here, since apples() can simply iterate the arguments and call oranges() from the loop. (Just venturing into 'guessing'). Andrew T. Back to top dimo414 Guest Posted: Tue Nov 14, 2006 8:11 am    Post subject: Re: Passing Unknown Number of Varaibles Andrew Thompson wrote: Quote: dimo414 wrote: I have two methods, let's call them apple and orange. Or let's not (is another alternative). The problem with such abstractions is that often the poster is assuming the method names (and ultimate meanings and use) is not relevant, whereas it often is. apple's signature is: public String apple(int...args) orange's signature is: public Int orange((int...args) What I'm trying to do is get apple to call orange, with the same parameters. Something like: Public String apple(int...args) { /* * Process the apple arguments */ orange(args[1], args[2], args[n]); } The problem is, I don't have the ability to change orange's functionality or signature, and I need to do it this way (trust me, I've tried others). Again, given you have not yet solved the problem, it is difficult to 'trust you'. Care to share the details, so we can make suggestions that amount to more than ..guessing? ..Is there some syntax or methodology to pass an unknown number of variables to orange? orange(Object[] array) orange(Vector elements) ..however, I do not think that is the real problem here, since apples() can simply iterate the arguments and call oranges() from the loop. (Just venturing into 'guessing'). Andrew T. I was hoping there would be some simple answer, so I wouldn't have to get into specifics. I'm building a static class to replace the Formatter class*. So my formatter method intitalizes an instance of Formatter, calls the format method, and returns it. But I cant figure out how to pass a variable number of methods to the Formatter's format method. *After I started this project, I discovered the String.format() method, which seems to do exactly what I'm looking for. But I really want to figure out a way to do this, and it's not being very friendly. I've tried passsing the whole array (Illegal argument), just the first value, updating the formating string, and looping through each variable (missing arguments, apparently it doesn't just process the first % it finds, it makes sure theres a match for each one), escaping all the parentheses exept the first one, which is, I suppose, theoreticaly possible. But the backslash itslelf has to be escaped, and that has to be escaped, and bleh... Any idea, now that I've explained it more? Back to top Knute Johnson Guest Posted: Wed Nov 15, 2006 5:43 am    Post subject: Re: Passing Unknown Number of Varaibles Ingo R. Homann wrote: Quote: Hi, I'm not sure, if I understand you correctly, but you know, that the following is possible, do you? public void orange(int...args){} public void apple(int...args) { // process args[i] orange(args); } Ciao, Ingo Apparently he doesn't like that answer even though it does exactly what he asked for. -- Knute Johnson email s/nospam/knute/ Back to top trippy Guest Posted: Wed Nov 15, 2006 8:02 am    Post subject: Re: Passing Unknown Number of Varaibles In article <1163463864.320323.277610 (AT) m73g2000cwd (DOT) googlegroups.com>, dimo414 took the hamburger meat, threw it on the grill, and I said "Oh Wow"... Quote: I have two methods, let's call them apple and orange. apple's signature is: public String apple(int...args) orange's signature is: public Int orange((int...args) What I'm trying to do is get apple to call orange, with the same parameters. Something like: Public String apple(int...args) { /* * Process the apple arguments */ orange(args[1], args[2], args[n]); } The problem is, I don't have the ability to change orange's functionality or signature, and I need to do it this way (trust me, I've tried others). Is there some syntax or methodology to pass an unknown number of variables to orange? Might want to try putting the variables in an arraylist then passing the arraylist. Beyond that, dunno. -- trippy mhm31x9 Smeeter#29 WSD#30 sTaRShInE_mOOnBeAm aT HoTmAil dOt CoM NP: "All I Really Want" -- Alanis Morissette "Now, technology's getting better all the time and that's fine, but most of the time all you need is a stick of gum, a pocketknife, and a smile." -- Robert Redford "Spy Game" Back to top Tor Iver Wilhelmsen Guest Posted: Wed Nov 15, 2006 11:50 pm    Post subject: Re: Passing Unknown Number of Varaibles "dimo414" <dimo414 (AT) gmail (DOT) com> writes: Quote: Any idea, now that I've explained it more? If two methods take the same number and types of arguments, you can use reflection. Back to top dimo414 Guest Posted: Thu Nov 16, 2006 3:01 pm    Post subject: Re: Passing Unknown Number of Varaibles I can't change the way format() (or orange()) takes arguments. I can't pass it an array, or an arrayList, I have to pass it a series of primative types or String objects. So if we were to simplify the question, how can I take an array of values, and pass each value to a method? Quote: Any idea, now that I've explained it more? If two methods take the same number and types of arguments, you can use reflection. I'm sorry, I don't know what that is, could you elaborate? Back to top Ingo R. Homann Guest Posted: Thu Nov 16, 2006 6:26 pm    Post subject: Re: Passing Unknown Number of Varaibles Hi, Quote: Any idea, now that I've explained it more? What's wrong with my post from 14.11., 10:05? Anyway, the following is no problem, either: void bar(String... strings) { } void foo() { String[] strings=... bar(strings); } I am very sure that it is very easy, what you want to achieve! Post us a snippet and I guess it can be answered! Ciao, ingo Back to top dimo414 Guest Posted: Sat Nov 18, 2006 3:21 am    Post subject: Re: Passing Unknown Number of Varaibles Ingo R. Homann wrote: Quote: Hi, Any idea, now that I've explained it more? What's wrong with my post from 14.11., 10:05? Anyway, the following is no problem, either: void bar(String... strings) { } void foo() { String[] strings=... bar(strings); } I am very sure that it is very easy, what you want to achieve! Post us a snippet and I guess it can be answered! Ciao, ingo Like I said in my reply on Mon, Nov 13 2006 9:55 pm, I am making a static version of the formatter class, and the format method of that class will not accept an array. Back to top Knute Johnson Guest Posted: Sat Nov 18, 2006 6:47 am    Post subject: Re: Passing Unknown Number of Varaibles dimo414 wrote: Quote: Like I said in my reply on Mon, Nov 13 2006 9:55 pm, I am making a static version of the formatter class, and the format method of that class will not accept an array. That's right, it takes a variable number of arguments not an array. You asked "I have two methods, let's call them apple and orange. apple's signature is: public String apple(int...args) orange's signature is: public Int orange((int...args) What I'm trying to do is get apple to call orange, with the same parameters. Something like: Public String apple(int...args) { /* * Process the apple arguments */ orange(args[1], args[2], args[n]); }" Several of us have shown you the answer to that question. See my answer and Ingo's. Are you really trying to pass a variable number of arguments to a method that takes an array? public class test11 { public static void main(String[] args) { apple(1,2,3); } public static void orange(int[] args) { for (int i : args) System.out.println(i); } public static void apple(int... args) { int[] arr = new int[args.length]; int index = 0; for (int i : args) arr[index++] = i; orange(args); } } -- Knute Johnson email s/nospam/knute/ Back to top Tor Iver Wilhelmsen Guest Posted: Sat Nov 18, 2006 4:03 pm    Post subject: Re: Passing Unknown Number of Varaibles "dimo414" <dimo414 (AT) gmail (DOT) com> writes: Quote: I'm sorry, I don't know what that is, could you elaborate? Basically you take the Method object from a class and invoke it using an array of values. See the javadocs for java.lang.Class.getMethod(), java.lang.reflect.Method and related stuff. 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