Array Zufall mit Prozent

import java.util.Arrays;
public class Main {
public static void main(String[] args) {
int[] arr = new int[200];
var r = new java.util.Random();
int rand;
int overzero = 0;
int underzero = 0;
int iszero = 0;
double sum = 0;
for (int i = 0; i < arr.length; i++) {
rand = r.nextInt(21) -10;
arr[i] = rand;
sum += arr[i];
if(arr[i] == 0){
iszero++;
}
if (arr[i] > 0 ){
overzero++;
}
if(arr[i] < 0){
underzero++;
}
}
System.out.println(Arrays.toString(arr));
System.out.println("Prozent exakt Null: " + ((double)iszero*100)/arr.length);
System.out.println("Prozent unter Null: " + ((double)underzero*100)/arr.length);
System.out.println("Prozent über Null: " + ((double)overzero*100)/arr.length);
System.out.println("Mittelwert lautet: " + (sum/arr.length));
}
}