Write a Java program to generate 200 random integers in the range of 0 and 999 (both inclusive). Then find the appearance frequency of each digit (0-9) in these numbers, and print a frequency histogram.

import java.util.Random;

public class ArrayBar {

  public static void main(String[] args) {

      int arr[] = new int[10];

      Random r = new Random();

      int n = 0;

      for (int i = 0; i < 200; i++) {

          n = r.nextInt(1000);

          while (n > 0) {

              arr[n % 10]++;

              n = n / 10;

          }

      }

      for (int i = 0; i < 10; i++) {

          System.out.print(i + " (" + arr[i] + "): ");

          for (int j = 0; j < arr[i]; j++) {

              System.out.print("*");

          }

          System.out.println();

      }

  }

}

Explanation: