题解 | #进制转换#

2、使用Integer.parseInt(hex, 16) 函数，返回int型有符号十进制整数，按16进制解析

import java.util.Scanner;


public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        String hex = in.nextLine();
        hex = hex.substring(2); //去掉0x

        //Integer.parseInt(hex, 16) 函数，返回int型有符号十进制整数，按16进制解析
        int res = Integer.parseInt(hex, 16);
        System.out.println(res);
    }
}