女生学java_Java Server Pages

public class Ic {
	

	public static String get18Ic(String identityCard) {
		String retId = "";
		String id17 = "";
		int sum = 0;
		int y = 0;
		
		int[] wf = { 7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2 };
		
		String[] cc = { "1", "0", "X", "9", "8", "7", "6", "5", "4", "3", "2" };
		if (identityCard.length() != 15) {
			return identityCard;
		}
		
		id17 = identityCard.substring(0, 6) + "19" + identityCard.substring(6);
		
		for (int i = 0; i < 17; i++) {
			sum = sum + Integer.valueOf(id17.substring(i, i + 1)) * wf[i];
		}
		
		y = sum % 11;
		
		retId = id17 + cc[y];
		return retId;
	}
	
	public static void main(String[] args) {
		// 例子 65463463456
		System.out.println(get18Ic("4654646"));
		// 结果 45646466464
	}

}