Java: How to check that 2 binary files are same?

Question

What is the easiest way to check (in a unit test) whether binary files A and B are equal?

Answer 1

If you want to avoid dependencies you can do it using quite nicely with Files.readAllBytes and Assert.assertArrayEquals

Assert.assertArrayEquals("Binary files differ", 
    Files.readAllBytes(Paths.get(expectedBinaryFile)), 
    Files.readAllBytes(Paths.get(actualBinaryFile)));

Note: This will read the whole file so it might not be efficient with large files.