decompress a string that is encoded with huffman compression algorithm

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Java

hi
i read file from input, then convert it to string and built the huffman tree
and gets the codes then, i write it to a file bit by bit, it works and decrease the size of file.
now i want to decompress that file , again i read that file bit by bit and save it to string, now i dont have any idea how to use codes to decompress :-??
please help


more information :
my prog have an array named

int[256] counts

that saves the freq of any object
also have an array named

String[256] codes

that saves the codes of any object

for example space(32):
index 32 of

int[256] counts

keep the freq of space
index 32 of

String[256] codes

keep the code of space

now think that the coded string is :

ASCII Code    Character       Frequency       Code

49                1             1             00
50                2             1             111
51                3             1             10
52                4             1             110
53                5             1             01

coded string is :

001111011001

how to decode ?