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Deleting duplicate lines in a file using Java

As part of a project I'm working on, I'd like to clean up a file I generate of duplicate line entries. These duplicates often won't occur near each other, however. I came up with a method of doing so in Java (which basically made a copy of the file, then used a nested while-statement to compare each line in one file with the rest of the other). The problem, is that my generated file is pretty big and text heavy (about 225k lines of text, and around 40 megs). I estimate my current process to take 63 hours! This is definitely not acceptable.

I need an integrated solution for this, however. Preferably in Java. Any ideas? Thanks!

asked Jun 18, 2015 in Core java by rajesh
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answered Jun 18, 2015 by rajesh