题解 | #进制转换#

import java.util.*;


public class Solution {
    /**
     * 进制转换
     * @param M int整型 给定整数
     * @param N int整型 转换到的进制
     * @return string字符串
     */
    public String solve (int M, int N) {
        int num = M;
        if (num < 0) {
            num = Math.abs(M);
        }

        String table = "0123456789ABCDEF";
        char[] chars = table.toCharArray();

        StringBuilder sb = new StringBuilder();
        while (num > 0) {
            int i = num % N;
            sb.append(chars[i]);
            num = num / N;
        }

        if (M < 0) {
            sb.append("-");
        }
        return sb.reverse().toString();
    }
}