what is difference between call by value and call by reference

what is difference between call by value and call by reference
[9 byte] By [TUBATIa] at [2007-11-27 9:51:50]
# 1
> hihi, how are you this morning?will you post another thread about the same subject with a different title like:Hi, what is the difference between ....?
suparenoa at 2007-7-13 0:21:01 > top of Java-index,Java Essentials,Java Programming...
# 2
>hihi = an expression of greeting; e.g. hi guys!!problem solve
Yannixa at 2007-7-13 0:21:02 > top of Java-index,Java Essentials,Java Programming...
# 3
One exists in Java and one doesn't
georgemca at 2007-7-13 0:21:02 > top of Java-index,Java Essentials,Java Programming...