Getting the size of a big file

Pretty basic stuff but I can't find a way to read the size of a file with several gigabytes. I'm aware of the method File.length. But int max value is 2,147,483,647. I开发者_开发知识库s there a standard API method to read the size of a file with more than 2 gigabytes (maybe something that returns the length in kilobytes, or with Long / BigInteger)? If there isn't, which libraries are used to do that?

Update

People kindly pointed out that I should RTFM. Long max size can fit 8388608 terabytes. :)

Cheers,

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File.length() returns a long

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According to the File API doc, length() returns long, not int.

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I believe that File.length() returns a long? That should be sufficient.