AppletTalk.com Java discussions newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Splitting Vector into smalller sub-Vectors          AppletTalk.com Forum Index -> Java Help View previous topic :: View next topic   Author Message Allan Bruce Guest Posted: Thu May 26, 2005 9:32 am    Post subject: Splitting Vector into smalller sub-Vectors Is it possible to efficiently split a large Vector into smaller sub-Vectors without iterating through it and adding the Objects to the sub-Vectors? If not, is there a collection which allows this? I dont need random access, I am just adding blindly to a single collection, then want to split it up at the end. Thanks. Allan Back to top Allan Bruce Guest Posted: Fri May 27, 2005 12:07 pm    Post subject: Re: Splitting Vector into smalller sub-Vectors Boudewijn Dijkstra wrote: Quote: "Allan Bruce" <amb (AT) abc (DOT) net> schreef in bericht news:KJ6dne1FloMoCgjfRVnytg (AT) pipex (DOT) net... Is it possible to efficiently split a large Vector into smaller sub-Vectors without iterating through it and adding the Objects to the sub-Vectors? If not, is there a collection which allows this? I dont need random access, I am just adding blindly to a single collection, then want to split it up at the end. java.util.List#subList(int,int) I tried using ArrayList for this but I get a ClassCastException error at the following line: lArray[j] = (ArrayList)lStates.subList(lStart, lEnd); What can I do to avoid this? I read the docs but cant see anything that says what to do. Thanks. Allan Back to top Virgil Green Guest Posted: Fri May 27, 2005 10:35 pm    Post subject: Re: Splitting Vector into smalller sub-Vectors Allan Bruce wrote: Quote: Boudewijn Dijkstra wrote: "Allan Bruce" <amb (AT) abc (DOT) net> schreef in bericht news:KJ6dne1FloMoCgjfRVnytg (AT) pipex (DOT) net... Is it possible to efficiently split a large Vector into smaller sub-Vectors without iterating through it and adding the Objects to the sub-Vectors? If not, is there a collection which allows this? I dont need random access, I am just adding blindly to a single collection, then want to split it up at the end. java.util.List#subList(int,int) I tried using ArrayList for this but I get a ClassCastException error at the following line: lArray[j] = (ArrayList)lStates.subList(lStart, lEnd); What can I do to avoid this? I read the docs but cant see anything that says what to do. Thanks. Allan sublist doesn't split the list. It only provides a view of part of the underlying list. It does not create a new object. You can't cast it the way you want because the object that is returned is a RandomAccessSubList, not an ArrayList. If you want separate ArrayLists to be created, use lArray[j] = new ArrayList(lStates.subList(lStart, lEnd)); Which takes the List (or RandamAccessSubList) object from sublist and uses it to create a new ArrayList. -- Virgil 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.