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@adrianoluis
adrianoluis / DocumentUtil.java
Last active January 18, 2024 22:21
Utility class to validate CPF and CNPJ document types. For CPF use isValidSsn and for CNPJ use isValidTfn. Added to repo https://github.com/adrianoluis/misc-tools
View DocumentUtil.java
public class DocumentUtil {
// CPF
private static final int[] WEIGHT_SSN = {11, 10, 9, 8, 7, 6, 5, 4, 3, 2};
// CNPJ
private static final int[] WEIGHT_TFN = {6, 5, 4, 3, 2, 9, 8, 7, 6, 5, 4, 3, 2};
private static int sum(int[] weight, char[] numbers, int length) {
if (length <= 0) return 0;