This week's giveaway is in the Android forum.
We're giving away four copies of Android Security Essentials Live Lessons and have Godfrey Nolan on-line!
See this thread for details.
The moose likes Beginning Java and the fly likes importing unnecessary classes Big Moose Saloon
  Search | Java FAQ | Recent Topics | Flagged Topics | Hot Topics | Zero Replies
Register / Login

Win a copy of Android Security Essentials Live Lessons this week in the Android forum!
JavaRanch » Java Forums » Java » Beginning Java
Bookmark "importing unnecessary classes" Watch "importing unnecessary classes" New topic

importing unnecessary classes

Lucas Franceschi
Ranch Hand

Joined: Nov 10, 2008
Posts: 106

importing unnecessary classes, does it makes my program run slowly or use more memory?

i mean, is it any bad to import classes that i don't use?

Lucas Franceschi
Software Developer for SGI Sistemas,
Ulf Dittmer

Joined: Mar 22, 2005
Posts: 41180
It has no impact at runtime, it's just a compile-time convenience.

Ping & DNS - my free Android networking tools app
fred rosenberger
lowercase baba

Joined: Oct 02, 2003
Posts: 11172

import statement are not like c-style 'includes'. They are kind of like a PATH variable for the file. they tell the compiler "if you can't figure out what the 'Person' class is, try looking for it in the 'org.mycompany.people' package" - and since package structures are basically a list of directories...

There are only two hard things in computer science: cache invalidation, naming things, and off-by-one errors
jQuery in Action, 2nd edition
subject: importing unnecessary classes
Similar Threads
import pkg.* vs. import pkg.class
Unable to compile class for JSP
Is import java.util.List faster than java.util.*
Why do we need static nested class?
import package performance