AppletTalk.com Java discussions newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  How to: create a list of objects?          AppletTalk.com Forum Index -> Java Discussions View previous topic :: View next topic   Author Message Zootal Guest Posted: Tue Jan 16, 2007 8:10 am    Post subject: How to: create a list of objects? How would you go about creating a list of objects, where each object can contain a list of objects, and each sub-object would have various properties(string, int)? This is an example. The parent object would be forms of transportation - car, bike, etc. Each parent object has child objects (chevy, ford, etc.) and each of these child objects has the same properties (number of doors, color). How would I represent this data? I need some pointers to start me in the right direction. Car - Chevy - 4 doors, green paint - Ford - 2 doors, purple paint - Nissan - 3 doors, red paint Bike - 26 inch, green - 27 inch, purple Back to top tia Guest Posted: Wed Jan 17, 2007 10:18 pm    Post subject: Re: How to: create a list of objects? It depends a lot on how you intend to use the objects. Do you want a unique set? Do you want them ordered? Do you plan to add or remove items from the list a lot? Do you want to allow nulls? My top two picks for holding objects are java.util.Map and java.util.Set of the Collections framework. Both are capable of holding your objects. Find out about Collections Framework here: http://java.sun.com/j2se/1.4.2/docs/guide/collections/index.html This is a good book which explains the Collections Frameworks very easily: Java Collections by John Zukowski ISBN: 1893115925 written in 2001, but the Collections Framework hasn't changed much since then, so still very very usable book. Zootal wrote: Quote: How would you go about creating a list of objects, where each object can contain a list of objects, and each sub-object would have various properties(string, int)? This is an example. The parent object would be forms of transportation - car, bike, etc. Each parent object has child objects (chevy, ford, etc.) and each of these child objects has the same properties (number of doors, color). How would I represent this data? I need some pointers to start me in the right direction. Car - Chevy - 4 doors, green paint - Ford - 2 doors, purple paint - Nissan - 3 doors, red paint Bike - 26 inch, green - 27 inch, purple Back to top Marc Guest Posted: Wed Jan 17, 2007 10:51 pm    Post subject: Re: How to: create a list of objects? tia wrote: Quote: It depends a lot on how you intend to use the objects. Do you want a unique set? Do you want them ordered? Do you plan to add or remove items from the list a lot? Do you want to allow nulls? My top two picks for holding objects are java.util.Map and java.util.Set of the Collections framework. Both are capable of holding your objects. Find out about Collections Framework here: http://java.sun.com/j2se/1.4.2/docs/guide/collections/index.html This is a good book which explains the Collections Frameworks very easily: Also Sams Java in 21 days is highly unrecommended if you're new to Java in general. Covers lots of collection types; vector, arraylist and hashtable spring to mind. -- Marc For contact information, please see my web site: http://www.iMarc.co.uk/ Back to top Zootal Guest Posted: Fri Jan 19, 2007 7:50 am    Post subject: Re: How to: create a list of objects? "Marc" <manictruth-ng (AT) NO_SPAMyahoo (DOT) co.uk> wrote in message news:1169052640.15036.0 (AT) damia (DOT) uk.clara.net... Quote: tia wrote: It depends a lot on how you intend to use the objects. Do you want a unique set? Do you want them ordered? Do you plan to add or remove items from the list a lot? Do you want to allow nulls? My top two picks for holding objects are java.util.Map and java.util.Set of the Collections framework. Both are capable of holding your objects. Find out about Collections Framework here: http://java.sun.com/j2se/1.4.2/docs/guide/collections/index.html This is a good book which explains the Collections Frameworks very easily: Also Sams Java in 21 days is highly unrecommended if you're new to Java in general. Covers lots of collection types; vector, arraylist and hashtable spring to mind. I'll check that out. One thing I'm having trouble finding is code examples for the beginner. Sun has a nice tutorial on collections, but where are the code samples? Back to top Paul Hamaker Guest Posted: Fri Jan 19, 2007 8:10 am    Post subject: Re: How to: create a list of objects? For Collection examples, see : http://javalessons.com/cgi-bin/fun/java-tutorials-main.cgi?sub=adv&ses=ao789 : a8 thru a12-5 and http://www.exampledepot.com/egs/java.util/pkg.html -- http://javalessons.com Paul Hamaker, SEMM Teaching ICT since 1987 Back to top Ook Guest Posted: Sat Jan 20, 2007 8:10 am    Post subject: Re: How to: create a list of objects? "Paul Hamaker" <ph (AT) semm (DOT) tmfweb.nl> wrote in message news:1169194094.431281.73510 (AT) v45g2000cwv (DOT) googlegroups.com... Quote: For Collection examples, see : http://javalessons.com/cgi-bin/fun/java-tutorials-main.cgi?sub=adv&ses=ao789 : a8 thru a12-5 and http://www.exampledepot.com/egs/java.util/pkg.html -- http://javalessons.com Paul Hamaker, SEMM Teaching ICT since 1987 Nice, thank you Back to top Display posts from previous: All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First         AppletTalk.com Forum Index -> Java Discussions 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.