File size (using java.io.File)

Question

Hello all,
When I want to create an app to be used as file browser, I should like to know the size of a file in a directory. The java.io.File class gives me quite some functionality, but not the functionality to display the file size.
Does anyone know of a default class that has the functionality to display the file size?
When no such class exists, I should need to develop it myself. From the top of my head it should be something like this:
int size = 0;
int aChar = 0;
FileReader reader = new FileReader (theFile);
while (reader.ready() )
    aChar = reader.read()
    size++;
}The variable size gives me now the number of characters in a file. But this should be done for each file in a particular directory. But does that not ask much CPU performance? Does anyone have an alternative?
Looking forward to your answer
Michel

Answer 1

Hi, I'm having the exact same problem, except that I'm doing a fax system so I can't copy a file while the file is still open. So to check to see if the file is open I have to check the file size in bytes then wait a second and check the file size again. If the file sizes differ then I have to check the next file otherwise I can copy the file. I had a look at the length() method but that will only return the actual length of the file name, not the size of the contents of the file which I need, can anyone please help? Say the file name is 16 ad an a or anything to the file name, if you the call the length() method again it will return 17.