Modify a .txt file in Java

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I haven’t done this in Java recently, but writing an entire file into memory seems like a bad idea.

The best idea that I can come up with is open a temporary file in writing mode at the same time, and for each line, read it, modify if necessary, then write into the temporary file. At the end, delete the original and rename the temporary file.

If you have modify permissions on the file system, you probably also have deleting and renaming permissions.

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