private static String toUnsignedString(int i, int shift) { char[] buf = new char[32]; int charPos = 32; int radix = 1 << shift; int mask = radix - 1; do { buf[--charPos] = digits[i & mask]; i >>>= shift; } while (i != 0); return new String(buf, charPos, (32 - charPos));}i = -1;i = 1;见Java编程思想operators章节本文来自博客，转载请标明出处：http://blog.csdn.net/numbernumber1111/archive/2009/03/26/4028195.aspx
