将长整型数值转换为指定的进制数（最大支持62进制，字母数字已经用尽） @param i @param radix @return
(long i, int radix)
| 71 | * @return |
| 72 | */ |
| 73 | private static String toHex(long i, int radix) { |
| 74 | if (radix < MIN_RADIX || radix > MAX_RADIX) |
| 75 | radix = 10; |
| 76 | if (radix == 10) |
| 77 | return Long.toString(i); |
| 78 | |
| 79 | final int size = 65; |
| 80 | int charPos = 64; |
| 81 | |
| 82 | char[] buf = new char[size]; |
| 83 | boolean negative = (i < 0); |
| 84 | |
| 85 | if (!negative) { |
| 86 | i = -i; |
| 87 | } |
| 88 | |
| 89 | while (i <= -radix) { |
| 90 | buf[charPos--] = digits[(int) (-(i % radix))]; |
| 91 | i = i / radix; |
| 92 | } |
| 93 | buf[charPos] = digits[(int) (-i)]; |
| 94 | |
| 95 | if (negative) { |
| 96 | buf[--charPos] = '-'; |
| 97 | } |
| 98 | |
| 99 | return new String(buf, charPos, (size - charPos)); |
| 100 | } |
| 101 | |
| 102 | static NumberFormatException forInputString(String s) { |
| 103 | return new NumberFormatException("For input string: \"" + s + "\""); |