Java - 백준 코딩테스트 2577번 [1차원 배열 - 숫자의 개수]

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
 
public class CountOfNums {
 
    public static void main(String[] args) throws IOException {
        // 20210621 - 2577번
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
        
        int num1 = Integer.parseInt(br.readLine());
        int num2 = Integer.parseInt(br.readLine());
        int num3 = Integer.parseInt(br.readLine());
 
        String multi = String.valueOf(num1 * num2 * num3);
        
        int arr[] = new int[multi.length()];
        
        for (int i = 0; i < arr.length; i++) {
            arr[i] = Character.getNumericValue(multi.charAt(i)); //Character.getNumericValue -> char값을 아스키코드값이 아닌 숫자형태로 변환해줌.
        }
        
        
        for (int i = 0; i < 10; i++) {
            int count = 0;
            for (int j = 0; j < arr.length; j++) {
                if (i == arr[j]) {
                    count++;
                }
            }
            bw.append(String.valueOf(count));
            bw.newLine();
        }
        
        bw.flush();
        bw.close();
        br.close();
    }
}