题解 | 进制转换

import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    /**
     * 进制转换
     * @param args
     */
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        while(scanner.hasNextLine()){
            String number = scanner.nextLine();
            number = number.replace("0x","");
            StringBuilder stringBuilder = new StringBuilder(number);
            int result = 0;
            for(char currentChar : stringBuilder.toString().toCharArray()){
                int currentNumber = charToInt(currentChar);
                result = result * 16 + currentNumber;
            }
            System.out.println(result);
        }
        scanner.close();
    }

    public static int charToInt(char currentChar) {
        if (currentChar >= '0' && currentChar <= '9') {
            return currentChar - '0';
        } else {
            return  currentChar - 'A' + 10;
        }
    }
}