With non-strict floating point arithmetic (the standard in Java), you can get slightly different results on different platforms.
As a contrived example, as a result of a complex expression you could get 1.23456789 on one platform, but 1.23456788 on another.
If you need the exact same results on all platforms, you use strictfp. Doing so can reduce performance on some platforms, though.
The soul is dyed the color of its thoughts. Think only on those things that are in line with your principles and can bear the light of day. The content of your character is your choice. Day by day, what you do is who you become. Your integrity is your destiny - it is the light that guides your way. - Heraclitus