It's for a mod installer I'm making. What this part does is, it checks if the file is already there, and if not it copies it from the downloaded folder into the .minecraft
While it's "easier" to do it with the java.nio classes (because there's a method for it I think), I still recommend using the java.io classes, as you can find the most help with those ones. http://examples.javacodegeeks.com/core-java/io/copy-binary-file-with-streams/ This shouldn't be too hard to understand :)
No, system properties are already set. Print the value of that property to console to see what it is. Hopefully it's the absolute path of your project folder.
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