如何在Java中显示小于20的随机数
首先，创建一个Random类对象-
Random rand = new Random();
现在，创建一个新数组-
int num; int arr[] = new int[10];
循环并将RandomnextInt设置为20作为参数，因为您需要小于20的随机数-
for (int j = 0; j <= 9; j++) {
num = 1 + rand.nextInt(20);
arr[j] = num;
}示例
import java.util.Arrays;
import java.util.Random;
public class Demo {
public static void main(String[] args) {
Random rand = new Random();
int num;
int arr[] = new int[10];
for (int j = 0; j<= 9; j++) {
num = 1 + rand.nextInt(20);
arr[j] = num;
}
System.out.println("Random numbers less than 20 = "+Arrays.toString(arr));
}
}输出结果Random numbers less than 6 = [4, 13, 14, 19, 1, 11, 17, 1, 11, 4]