AppletTalk.com Java discussions newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Possible to use reflection to get constructor params/args          AppletTalk.com Forum Index -> Java Help View previous topic :: View next topic   Author Message Petterson Mikael Guest Posted: Wed Jun 28, 2006 6:31 pm    Post subject: Possible to use reflection to get constructor params/args Hi, Is it possible to use reflection to get the param/arg names i and d in second constructor? ( I am using jdk 1.4). cheers, //mikael public class Constructor1 { public Constructor1() { } protected Constructor1(int i, double d) { } } Back to top Hendrik Maryns Guest Posted: Wed Jun 28, 2006 6:50 pm    Post subject: Re: Possible to use reflection to get constructor params/arg -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Petterson Mikael schreef: Quote: Hi, Is it possible to use reflection to get the param/arg names i and d in second constructor? ( I am using jdk 1.4). cheers, //mikael public class Constructor1 { public Constructor1() { } protected Constructor1(int i, double d) { } } The names are absolutely meaningless, except in the inners of the method, so there is absolutely no reason to want to get them. What do you REALLY want? H. - -- Hendrik Maryns ================== http://aouw.org Ask smart questions, get good answers: http://www.catb.org/~esr/faqs/smart-questions.html -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.2 (GNU/Linux) iD8DBQFEookbe+7xMGD3itQRAtcdAJ9Q6A8LgNjJEKlQ/yxgaQLoJQho/ACdF/N1 3QTlA9M1/kB+HXOiqwxsvCM= =A+Kz -----END PGP SIGNATURE----- Back to top Thomas Hawtin Guest Posted: Wed Jun 28, 2006 9:27 pm    Post subject: Re: Possible to use reflection to get constructor params/arg Petterson Mikael wrote: Quote: Is it possible to use reflection to get the param/arg names i and d in second constructor? ( I am using jdk 1.4). No, the information is not present in the source file. There are a number of workarounds: o APT (introduced in 1.5, part of javac in 1.6) gives access to parameter names (it works on source). For instance see: http://weblogs.java.net/blog/emcmanus/archive/2006/06/intermxbean_ref.html o Run some form of parser on your source to store the information in a convenient format. You could use a complete parser (like APT), or add tags within comments to the source. o Compile with variable name debugging enabled, and use ASM (or similar) to read the class file. o Compile with line number and file name debugging. Read the information for the constructors with either ASM or arrange for an exception to be thrown/created (and parse the stack trace). Use a regex to extract the information from the source (which will need to be easy to regex). See: http://www.jroller.com/page/cpurdy?entry=yaul_trace Tom Hawtin -- Unemployed English Java programmer http://jroller.com/page/tackline/ Back to top Display posts from previous: All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First         AppletTalk.com Forum Index -> Java Help All times are GMT Page 1 of 1   Jump to: Select a forum Java Newsgroups----------------Java DiscussionsWeb-based java games comp.lang.java 3D Graphics API's for Java Java: Support and criticism Java System Announcements comp.lang.java.api JavaBeans Java and CORBA Java and Databases comp.lang.java.developer Java GUI Toolkits Java Help comp.lang.java.javascript JVM, native methods and hardware comp.lang.java.misc Java Language Programming Security and Java comp.lang.java.setup Java Software Tools comp.lang.java.tech ibm.software.java.linux  Non-English Java Newsgroups----------------Java Language (German)Language Java (Français)Java (Italian)  You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum Powered by phpBB © 2001, 2006 phpBB Group SEO toolkit © 2004-2006 webmedic.