Cálculo del dígito de control del código de municipio INE

DigitoControl.java

public class DigitoControl {
	private static final int[][] magic = {
			{0, 1, 2, 3, 4, 5, 6, 7, 8, 9},
			{0, 3, 8, 2, 7, 4, 1, 5, 9, 6},
			{0, 2, 4, 6, 8, 1, 3, 5, 7, 9}
	};

	public static int calc(int test) {
		byte[] bytes = String.format("%05d", test).getBytes();	
		
		int sum = 0, i = 0;
		for(Byte v : bytes){
			sum+=magic[2 - i % 3][v - 48];
			i++;
		}
		
		return sum == 0?0:10 - sum % 10;
	}

	public static void main(String[] args) {
		System.out.println(calc(1001));
	}
}