随机数发生器输出0-9

Question

嗨我现在遇到了我的代码问题，因为我已经被困了一段时间了，我是java编程的新手。我希望代码输出从0到9而不是1-10，我的代码和输出显示在下面：

import java.util.Arrays;

public class RandNumGenerator {

public static int RandInt(){
    double n = Math.random()*10;
    return (int) n;
    }

public static void randTest(int n){
    int [] counts = new int [10];
    int sampleSize = 10000;
    int RandNum = RandInt();

    System.out.println ("Sample Size: " + sampleSize);
    String[] intArray = new String[] {"Value","Count","Expected","Abs Diff","Percent Diff"};
    System.out.println(Arrays.toString(intArray));



    for(int i=0;i<n;i++){
        counts[ RandNum ] = counts[ RandNum ] + 1;
        System.out.println(counts[RandNum]);
        } 
    }

public static void main(String[] args) {
    randTest(10);
    }
}

输出为1-10，而不是0-9：

Sample Size: 10000
[Value, Count, Expected, Abs Diff, Percent Diff]
 1
 2
 3
 4
 5
 6
 7
 8
 9
 10