生成多个范围之间的随机数 [英] Generating a random number between multiple ranges
本文介绍了生成多个范围之间的随机数的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我了解如何制作两个数字之间的随机数:
I understand how to make a random number which is between two numbers:
1 + (int)(Math.random() * ((10 - 1) + 1))
或
Min + (int)(Math.random() * ((Max - Min) + 1))
但是我该如何生成一个随机数呢?
But how do I go about generating a random number which falls into multiple ranges?
例如:数字可以在1到10之间或50到60之间
For example: number can be between 1 to 10 or between 50 to 60
推荐答案
我会采用这样的方法,以允许您在任意范围内使用它:
I'd go with something like this, to allow you to do it with as many ranges as you like:
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
class RandomInRanges
{
private final List<Integer> range = new ArrayList<>();
RandomInRanges(int min, int max)
{
this.addRange(min, max);
}
final void addRange(int min, int max)
{
for(int i = min; i <= max; i++)
{
this.range.add(i);
}
}
int getRandom()
{
return this.range.get(new Random().nextInt(this.range.size()));
}
public static void main(String[] args)
{
RandomInRanges rir = new RandomInRanges(1, 10);
rir.addRange(50, 60);
System.out.println(rir.getRandom());
}
}
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