为什么类型不匹配啊？
程序代码：import java.util.*;
public class Tm58 {
public static void main(String[] args) {
Random rand = new Random(47);
Integer[] a = new Integer[rand.nextInt(20)];
System.out.println("length of a= " + a.length);
for (int i = 0; i < a.length; i++)
a[i] = rand.nextInt(500);
System.out.println(Arrays.toString(a));
}
}
