见http://docs.oracle.com/javase/7/docs/api/java/util/Random.html#setSeed(long)。代码xors种子与乘数之前减少它mod 2 ^ 48。为什么不减少传递的种子mod 2 ^ 48？ C等效种子48不执行xor。
答案 0 :(得分：3)
你可以在这里找到一个很好的读物：java.util.Random’s Magic Number 0x5DEECE66D。
和引用：
The analysis says it was chosen simply because researchers determined empirically
that it produces a sequence of values satisfying various randomness tests
这个Document也给了魔术数字。
还有一个引用：
然后我尝试搜索十进制值，不包括Java，然后找到 一些课堂笔记中的答案：
http://nut.bu.edu/~youssef/py502/monte_carlo_supplement.ps http://www.inf.ethz.ch/personal/gaertner/texts/own_work/random_matrices.pdf
and in some computer documentation:
http://developer.apple.com/documentation/Darwin/Reference/ManPages/html/_rand48.3.html
The Youssef notes say:
... I can only say that 25214903917_LONG and 11_LONG have
apparently been chosen by passing a battery of such [meaning
Marsaglia's DIEHARD] tests.
... Even in the case of the 48-bit generators we are discussing
today, cas26 will generate them all in a month or two of CPU time
and then start to repeat.