如何获得范围为负数的随机数? [英] How do I get a random number with a negative number in range?

问题描述

考虑以下代码:

int rand = new Random().nextInt((30 - 20) + 1) + 20

它将返回30到20之间的一个随机数.但是，我需要它的范围包括负数.我如何在这一代中包括负数?

It will return a random number between 30 and 20. However, I need its range to include negative numbers. How would I include negative numbers in the generation?

我曾尝试使用会为负数的数学运算，但这会导致错误.简单地减去或加上负数将不会产生所需的值.

I have tried using math that would be negative, but that resulted in an error. Simply subtracting or adding the negative numbers would not yield the desired value.

对不起，我只有半醒.正确的代码是 int rand = new Random().nextInt((30-20)+ 1)+ 20; .

Sorry, I am only half awake. The correct code is int rand = new Random().nextInt((30 - 20) + 1) + 20;.

推荐答案

使用 min 和 max 获取设置范围内的随机数:

To get a random number between a set range with min and max:

int number = random.nextInt(max - min) + min;

它也适用于负数.

所以:

random.nextInt(30 + 10) - 10;
// max = 30; min = -10;

将产生一个介于-10和30(不包括)之间的随机整数.

Will yield a random int between -10 and 30 (exclusive).

它也可以用于双打.

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