2-62之间的进制转换

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//2-62之间的进制转换，用[0-9a-zA-Z]表示数字import java.util.Scanner;public class Main {    public int charToInt(char c) {        if (c >= '0' && c <= '9') {            return c - '0';        } else if (c >= 'a' && c <= 'z') {            return c - 'a' + 10;        } else if (c >= 'A' && c <= 'Z') {            return c - 'A' + 36;        }        return 0;    }//charToInt    public char intToChar(int i) {        char[] c = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',                'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n',                'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',                'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N',                'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'};        return c[i];    }//intToChar    public String convert(int sReg, int dReg, String sStr) {        if (sStr.equals("0")) {            return "0";        }        //判断是否是负数        boolean negativeFlag = false;        if (sStr.startsWith("-")) {            sStr = sStr.substring(1, sStr.length());            negativeFlag = true;        }        char[] sChar = sStr.toCharArray();        int n = sStr.length();        int decimalInt = 0;        String dStr = "";        //先转换为十进制        for (int i = 0; i < n; i++) {            decimalInt += charToInt(sChar[i]) * Math.pow(sReg, n - i - 1);        }        while (decimalInt != 0) {            dStr = intToChar(decimalInt % dReg) + dStr;            decimalInt = decimalInt / dReg;        }        //如果是负数        if (negativeFlag == true) {            return "-" + dStr;        }        return dStr;    }//convert    public static void main(String[] args) {        Scanner sc = new Scanner(System.in);        int sReg = sc.nextInt();        int dReg = sc.nextInt();        String sStr = sc.nextLine().trim();        System.out.println(new Main().convert(sReg, dReg, sStr));    }}//输入：//源进制  目标进制  源数////输出：//目标数//8 16 1234//29c
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