Creating a package name questions.

Question

If I want to put all my classes in a package called:
package com.xxx.yyy.zzzz;
Can I use com? Is com like a reserved name? Where would I place xxx?

Answer 1

packages should correspond with your domain name, so if you own a .com (say [url http://forum.java.sun.com/thread.jsp?forum=53&thread=399128&tstart=0&trange=15]weLoveTheForumAdmin.com), then you package would be
package com.welovetheforumadmin.<whatever you want>;
if you own a .tk or .gb or .uk, it would change approperatly.
If you don't own a domain name, then you could use your website url (say you have a geocities account called [url http://forum.java.sun.com/thread.jsp?forum=53&thread=399128&tstart=0&trange=15]welovetheforumadmin , then you could use
package com.geocities.welovetheforumadmin.<what everyour want>;
(or get a free domain/sub domain from say from [url http://www.dot.tk/].tk or [url http://www.no-ip.com/]No IP.
If you have no web pressence, its acceptable to place under something that is not, and never will be a TLD, eg
package we_love_the_forum_admin.<what ever you want>;
However, NEVER put anything in the java, javax or com.sun name spaces.
It should be noted that not [url http://www.microsoft.com]everyone [url http://classpath.org]one follows these rules.
(Microsoft not only puts stuff in the java name space, but also under the com.ms namespace (Morgan Stanley), while Classpath buts its plateform dependent stuff in the gnu namespace, not org.gnu, while many people don't care it becomes a problem if say both morgan stanley and MS release a com.ms.WeLoveTheForumAdmin class).