Java tutorial
//package com.java2s; public class Main { private final static String str62 = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"; private static final String ten2Any(long num, int base) { StringBuilder sb = new StringBuilder(7); while (num != 0) { sb.append(str62.charAt((int) (num % base))); num /= base; } return sb.reverse().toString(); } }