What is the best way of replacing words in a text file ?

i want to read in a text file and when i come across a certain word, i want to change it to something else. Whats the best way to do this ?
If i read in a line at a time, how would i only replace one word and not the rest of the line ?
thanks

thanks it works !!! But i wrote the contents to a new file.
How do i overwrite the same file ? I put the the input and output file as the same location but it overwrites the original file with a blank one.
i guess i have to write into another buffer and read all lines first before overwriting the file right ? how should i do that ?
also, i only want to overwrite the file ONLY if applies replaceAll method, otherwise if no replacing takes place i dont want to keep updating the file everytime.

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