Topic: Random 随即数的范围

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1.Random 随即数的范围 Copy to clipboard
Posted by: fgh520
Posted on: 2006-04-30 15:51

Math.abs(Random.nextInt()) % 100 + 1
急用，谢谢了。
2.Re:Random 随即数的范围 [Re: fgh520] Copy to clipboard
Posted by: fgh520
Posted on: 2006-04-30 15:52

上面表达式产生随即数的范围是？
3.Re:Random 随即数的范围 [Re: fgh520] Copy to clipboard
Posted by: why
Posted on: 2006-04-30 19:13

http://java.sun.com/j2se/1.4.2/docs/api/java/util/Random.html#nextInt()
nextInt() : All 23^2 possible int values are produced with (approximately) equal probability
However, since the % operator is used,
abs(? % 100) ==> 0 to 99
+ 1 ==> 1 to 100
4.Re:Random 随即数的范围 [Re: fgh520] Copy to clipboard
Posted by: ranchgirl
Posted on: 2006-05-01 00:43

It can be as simple as


int getRandom(int min, int max) {
  return min + (int)(Math.random() * (max - min + 1));
}


If you want the random in the range of min to max inclusive.
5.Re:Random 随即数的范围 [Re: fgh520] Copy to clipboard
Posted by: fgh520
Posted on: 2006-05-08 19:32

明白了。在这学到的东西不少啊。
高手很多啊。我还得继续努力啊。

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