Java随机数介于-100和100之间 [英] Java Random number between -100 and 100

问题描述

我已经创建了该程序来打印-100到100之间的数字，但是我想知道这是否是正确的方法，还是必须在限制a(和b)之间进行?

I have created this program to print numbers between -100 and 100 but I am wondering if this is the right way to do it or it has to be done between limits (pre-specified) a and b?

public class RandomNumber {


public static void main (String [] args){


     for (int i = 1; i <= 10 ; i++)
       {
        int Random = (int)(Math.random()*-100);
        System.out.println(Random);
       }
     for (int i = 1; i <= 10 ; i++)
       {
        int Random1 = (int)(Math.random()*100);
        System.out.println(Random1);
       }


}

}

推荐答案

拥有更通用的函数可以重复使用总是很高兴的:

It's always nice to have a more general function which you can reuse:

private static int getRandomNumber(int a, int b) {
    if (b < a)
        return getRandomNumber(b, a);
    return a + (int) ((1 + b - a) * Math.random());
}

public static void main(String[] args) {
    for (int i = 0; i < 10; i++) {
        System.out.format("%d ", getRandomNumber(-100, 100));
    }
}

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