题解 | 16进制转换(Integer.parseInt(Number, 16);)

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        String Number = in.nextLine().trim();
        
        // 去除可能的0x或0X前缀
        if (Number.startsWith("0x") || Number.startsWith("0X")) {
            Number = Number.substring(2);
        }
        
        if (Number.isEmpty()) {
            System.out.println("输入无效");
            return;
        }
        
        try {
            int decimalNumber = Integer.parseInt(Number, 16);
            System.out.println(decimalNumber);
        } catch (NumberFormatException e) {
            System.out.println("输入的十六进制数超出范围");
        }
    }
    
   
    }