How to find out the end of the file in java

hi friends,
I am reading a file char by char. So how can I check for end of the file. I va a integer of the character and a string which has hex value of the character.
but when I execute the pgm, it shows out of memory error. overflow of the heap.
can anyone help???
thanks in advance...
bye

There is no "type of file". It's all zeroes andones.
thing is am wrintin a file. I want to set the
type(extension) to be .iso. how can i do that???If you want to make the extension ".iso" then just end the file name with ".iso".
If you want to make the "type" iso, so that it can be manipulated by an iso application or whatever, then you have to make sure the bytes you write are of the proper format.
As already stated: Files don't have a type.

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How to find out the end of the file in java

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