Question

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Size of folder or file

I used this code to instantiate a File object:

File f = new File(path);

How do I get the size of this file?

What is the difference between getUsableSpace(), getTotalSpace(), and getFreeSpace()?

Answer 1

Use the length() method in the File class. From the javadocs:

Returns the length of the file denoted by this abstract pathname. The return value is unspecified if this pathname denotes a directory.

UPDATED Nowadays we should use the Files.size() method:

Path path = Paths.get("/path/to/file");
long size = Files.size(path);

For the second part of the question, straight from File‘s javadocs:

• getUsableSpace() Returns the number of bytes available to this virtual machine on the partition named by this abstract pathname

• getTotalSpace() Returns the size of the partition named by this abstract pathname

• getFreeSpace() Returns the number of unallocated bytes in the partition named by this abstract path name