十六进制转成十进制

import java.util.*;

public class Main {

private final static int BASE = 16;

private static Map<Character, Integer> map = new HashMap<Character, Integer>()

{{

put('0', 0);

put('1', 1);

put('2', 2);

put('3', 3);

put('4', 4);

put('5', 5);

put('6', 6);

put('7', 7);

put('8', 8);

put('9', 9);

put('A', 10);

put('B', 11);

put('C', 12);

put('D', 13);

put('E', 14);

put('F', 15);

put('a', 10);

put('b', 11);

put('c', 12);

put('d', 13);

put('e', 14);

put('f', 15);

}};

public static int getDecimal(String number) {

int res = 0;

for (char ch : number.toCharArray()) {

res = res * BASE + map.get(ch);

}

return res;

}

public static void main(String[] args) {

Scanner in = new Scanner(System.in);

while (in.hasNext()) {

String number = in.next();

int res = getDecimal(number.substring(2));

System.out.println(res);

}

}

}