File APIs for Java Developers
Manipulate DOC, XLS, PPT, PDF and many others from your application.
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
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: 42965
It has no impact at runtime, it's just a compile-time convenience.
fred rosenberger
lowercase baba

Joined: Oct 02, 2003
Posts: 11955

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
I agree. Here's the link:
subject: importing unnecessary classes
It's not a secret anymore!