题解 | #进制转换#

import java.io.*;
import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        while (sc.hasNextLine()) {
            String s = sc.nextLine();
            System.out.println(Integer.parseInt(s.substring(2, s.length()), 16));
        }
    }
}

1. 十六进制以0x/0X开头，丢掉
2. parseInt接受一个进制参数