为Random.nextInt()指定最大值和最小值? [英] Specify max and min for Random.nextInt()?

问题描述

可能重复:
Java:生成一定范围内的随机数

Possible Duplicate:
Java: generating random number in a range

我想在逻辑范围内生成一个随机整数.因此，举例来说，我正在编写一个程序来掷掷"具有指定边数的骰子.

I want to generate a random int in a logical range. So, say for example, I'm writing a program to "roll" a dice with a specified number of sides.

public int rollDice() {
     Random generator = new Random();
     return generator.nextInt(sides);
}

现在的问题是这将返回边和零之间的值，包含，这没有任何意义，因为大多数骰子从1到6、9等.所以我如何指定nextInt应该工作在1到边数之间?

Now the problem becomes that this will return values between sides and zero, inclusive, which makes no sense because most dice go from 1 to 6, 9, etc. So how can I specify that nextInt should work between 1 and the number of sides?

推荐答案

要在 from 和 to (含)之间生成随机的int值(均匀分布)，请使用:

To generate a random int value (uniform distribution) between from and to (inclusive) use:

from + rndGenerator.nextInt(to - from + 1)

以您的情况(1 ..面):

In your case (1..sides):

1 + rndGenerator.nextInt(sides)

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