adicionarMascaraCnpfCpf.java

private static String adicionarMascaraCnpfCpf(String valor) {

		if (valor.length() == 14) {
			Pattern pattern = Pattern.compile("(\\d{2})(\\d{3})(\\d{3})(\\d{4})(\\d{2})");
			Matcher matcher = pattern.matcher(valor);
			if (matcher.find()) {
				return matcher.replaceAll("$1.$2.$3/$4-$5");
			}
		}

		if (valor.length() == 11) {
			Pattern pattern = Pattern.compile("(\\d{3})(\\d{3})(\\d{3})(\\d{2})");
			Matcher matcher = pattern.matcher(valor);
			if (matcher.find()) {
				return matcher.replaceAll("$1.$2.$3-$4");
			}
		}

		return valor;
	}