In order to compress a file file.dat, invoke the result .jar file as follows:

java -jar HuffmanCompressorApp.jar file.dat

That will create a compressed file file.data.huf.

In order to decompress a .huf file, invoke as follows:

java -jar HuffmanCompressorApp.jar file.dat.huf uncompressed.file.dat

On Windows command line, type:

fc /b FILE1 FILE2

For example:

fc /b file.dat uncompressed.file.dat

On *nix, type:

cmp -s FILE1 FILE2

For example:

cmp -s file.dat uncompressed.file.dat