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Find a replace between files

Aiglee Castillo
Greenhorn

Joined: Aug 10, 2006
Posts: 27
Hi everyone!

I need to write a little program that reads from file_1 two values per line, and then reads from file_2 if the first value of file_1 is there and replace in file_2 (or write in another file) the new value.

For example

file_1:
45404500705804504196740100
45404500705805004196740101

file_2:
584195497000 454045007058003
584195497001 454045007058045
584195497002 454045007058030
584195497003 454045007058050

New file:
584195497000 454045007058003
584196740100 454045007058045
584195497002 454045007058030
584196740101 454045007058050

Thanks for any help you can give me. I don't need actual code, but the functions or path I should take

Thanks!
marc weber
Sheriff

Joined: Aug 31, 2004
Posts: 11343

Originally posted by Aiglee Castillo:
...I don't need actual code, but the functions or path I should take...

Is there a specific part of this process that you're questioning?

If not, then here's my general advice: Describe your process in English before starting to code, breaking it down into detailed steps. (Something like: Read this value and store it here. Compare this variable to that variable. If this specific condition is true, then...) Once you have the process (logic) defined, then you can start translating it into code.


"We're kind of on the level of crossword puzzle writers... And no one ever goes to them and gives them an award." ~Joe Strummer
sscce.org
 
It is sorta covered in the JavaRanch Style Guide.
 
subject: Find a replace between files