Strictfp确保您从每个平台上的浮点计算获得完全相同的结果。如果不使用strictfp，JVM实现可以在可用的地方使用额外的精度。

Within an FP-strict expression, all

intermediate values must be elements

of the float value set or the double

value set, implying that the results

of all FP-strict expressions must be

those predicted by IEEE 754 arithmetic

on operands represented using single

and double formats. Within an

expression that is not FP-strict, some

leeway is granted for an

implementation to use an extended

exponent range to represent

intermediate results; the net effect,

roughly speaking, is that a

calculation might produce “the correct

answer” in situations where exclusive

use of the float value set or double

value set might result in overflow or

underflow.

换句话说，它是关于确保一次写入一次运行实际上意味着一次写的同时获取错误结果无处不在。

使用strictfp你的结果是可移植的，没有它，他们是更可能是准确的。