Java program to read unique records from a file

I have a file which about a GB, its from a SQL output which has dups in it.(abc.txt)
I am trying to wrtie a program which could read abc.txt and write the unique records to def.txt
How can I do this in java.

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Recipe: 1 boolean for uniqueness, 2 nested for loops, iterate the list, each element against all others, if unique at the end of outer loop, write it to new file, if not, move to next in outer loop.

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Ow, that's for unique values, you want de-duping.
Thanks. It should work for dupes though too. ;)
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