java新手，为什么输出的数组元素都是0，求大神告知

Question

import java.util.Arrays; public class a {public static void main(String[] args) { int num=8; a hello=new a(); int shuZu[]=hello.score(num); System.out.println(Arrays.toString(shuZu)); } public int[] score(int num) { int shuZu[]=new int[num]; for(int i=0;i<shuZu.length;i++) { shuZu[i]=(int) Math.random()*100; } return shuZu; } }