BASIC-12 十六进制转八进制

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int t = sc.nextInt();
        for (int j = 0; j < t; j++) {
            String str = sc.next();
            int len = str.length();
            int[] binary = new int[100000 * 4 + 10];
            for (int i = 0; i < len; i++) {
                String string = hexadecimalToBinary(str.charAt(i));
                binary[i * 4 + 0] = string.charAt(0) - ‘0‘;
                binary[i * 4 + 1] = string.charAt(1) - ‘0‘;
                binary[i * 4 + 2] = string.charAt(2) - ‘0‘;
                binary[i * 4 + 3] = string.charAt(3) - ‘0‘;
            }

            int llen = 4 * len;
            StringBuilder ans = new StringBuilder();
            ans.append("");
            if (llen % 3 == 0) {
                for (int i = 0; i < llen / 3; i++) {
                    String string = binaryToOctonary(binary[3 * i], binary[3 * i + 1], binary[3 * i + 2]);
                    ans.append(string);
                }
            } else if (llen % 3 == 1) {
                int temp = binary[0];
                if (temp != 0)
                    ans.append("1");
                for (int i = 0; i < llen / 3; i++) {
                    String string = binaryToOctonary(binary[3 * i + 1], binary[3 * i + 2], binary[3 * i + 3]);
                    ans.append(string);
                }
            } else {
                int temp = binary[0] * 2 + binary[1];
                if (temp != 0)
                    ans.append(temp);
                for (int i = 0; i < llen / 3; i++) {
                    String string = binaryToOctonary(binary[3 * i + 2], binary[3 * i + 3], binary[3 * i + 4]);
                    ans.append(string);
                }
            }
            int l = 0;
            l = ans.length();
            if (ans.charAt(0) == ‘0‘) {
                System.out.println(ans.substring(1));
            } else {
                System.out.println(ans);
            }
        }
        sc.close();
    }

    private static String binaryToOctonary(int i, int j, int k) {
        return (4 * i + 2 * j + 1 * k) + "";
    }

    private static String hexadecimalToBinary(char c) {
        String str = null;
        switch (c) {
        case ‘0‘:
            str = "0000";
            break;
        case ‘1‘:
            str = "0001";
            break;
        case ‘2‘:
            str = "0010";
            break;
        case ‘3‘:
            str = "0011";
            break;
        case ‘4‘:
            str = "0100";
            break;
        case ‘5‘:
            str = "0101";
            break;
        case ‘6‘:
            str = "0110";
            break;
        case ‘7‘:
            str = "0111";
            break;
        case ‘8‘:
            str = "1000";
            break;
        case ‘9‘:
            str = "1001";
            break;
        case ‘A‘:
            str = "1010";
            break;
        case ‘B‘:
            str = "1011";
            break;
        case ‘C‘:
            str = "1100";
            break;
        case ‘D‘:
            str = "1101";
            break;
        case ‘E‘:
            str = "1110";
            break;
        case ‘F‘:
            str = "1111";
            break;
        }
        return str;
    }
}