ValidarCNH.java

public class ValidarCNH {
	/*Código para validar CNH em java
	 * Baseado no código disponível em: https://gist.github.com/felipecwb/f32f70bf05bdf1ec5663
	 * */

	public static boolean validaCNH(String cnh) {
		char char1 = cnh.charAt(0);

		if (cnh.replaceAll("\\D+", "").length() != 11
				|| String.format("%0" + 11 + "d", 0).replace('0', char1).equals(cnh)) {
			return false;
		}

		long v = 0, j = 9;

		for (int i = 0; i < 9; ++i, --j) {
			v += ((cnh.charAt(i) - 48) * j);
		}

		long dsc = 0, vl1 = v % 11;

		if (vl1 >= 10) {
			vl1 = 0;
			dsc = 2;
		}

		v = 0;
		j = 1;

		for (int i = 0; i < 9; ++i, ++j) {
			v += ((cnh.charAt(i) - 48) * j);
		}

		long x = v % 11;
		long vl2 = (x >= 10) ? 0 : x - dsc;

		return (String.valueOf(vl1) + String.valueOf(vl2)).equals(cnh.substring(cnh.length() - 2));

	}

	public static void main(String[] args) {
		System.out.println(validaCNH("07021871297"));
	}

}