Java 如何在两个数字之间生成随机值
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How do I generate a random value between two numbers
提问by user339108
Possible Duplicate:
Java: generating random number in a range
可能的重复：
Java：在一个范围内生成随机数
How do I generate a random value between two numbers. Random.nextInt()gives you between 0 and the passed value. How do I generate a value between minValue and a maxValue
如何在两个数字之间生成随机值。Random.nextInt()为您提供 0 和传递值之间的值。如何在 minValue 和 maxValue 之间生成一个值
采纳答案by Margus
Write a method like:
写一个方法，如：
public static int getRandom(int from, int to) {
if (from < to)
return from + new Random().nextInt(Math.abs(to - from));
return from - new Random().nextInt(Math.abs(to - from));
}
This also takes account for facts, that nextInt()argument must be positive, and that fromcan be bigger then to.
这也考虑了事实，即nextInt()参数必须是积极的，而从可以更大然后到。
回答by Petar Minchev
random.nextInt(max - min + 1) + minwill do the trick. I assume you want min <= number <= max
random.nextInt(max - min + 1) + min会做的伎俩。我假设你想要min <= number <= max
回答by cloverink
Example: Generating a number from 1 to 6
Because nextInt(6) returns a number from 0-5, it's necessary to add 1 to scale the number into the range 1-6
示例：生成1到6的数字
因为nextInt(6)返回的是0-5的数字，所以需要加1才能将数字缩放到1-6的范围内
static Random randGen = new Random(); int spots; . . . spots = randGen.nextInt(6) + 1;
