Had we only 8 fingers we might have used base 8, (aka octal radix 8). In octal you count 0 1 2 3 4 5 6 7 10 11 12…
Computers internally always use base 2 (aka binary, radix 2) in which you count like this 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111…
People intererested in the internals of computers like to use base 16 (aka hex, hexadecimal, radix 16). In it you count like this:0 1 2 3 4 5 6 7 8 9 A B C D E F 10 11 12 13 14 15 16 17 18 19 1A 1B 1C 1D 1E 1F 20… It is very easy to interconvert hex back and forth to binary using this little table:
Binary to Hex Conversion  

binary  0000  0001  0010  0011  0100  0101  0110  0111  1000  1001  1010  1011  1100  1101  1110  1111 
hex  0  1  2  3  4  5  6  7  8  9  A  B  C  D  E  F 
decimal  0  1  2  3  4  5  6  7  8  9  10  11  12  13  14  15 
You can convert the computers internal binary formats (int, long) to Strings in any radix you want and back using builtin Java conversion functions.
Java has special support for octal and hex literals and strings in number bases 2 through 36.
// convert int to String with given radix String g = Integer.toString( i, 36 /* radix 2 to 36 */ ); // convert String to int when string is encoded with a given radix int i = Integer.parseInt( g.trim(), 36 /* radix 2 to 36 */ );For larger radixes, you could examine Oracle’s code and write your own code with a larger cast of encoding characters.
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