Converting ArrayList of bytes to byte[]

Question

I'm looking to convert an ArrayList of bytes to byte[] in order to create a file with these bytes later. I've searched high and low on how to do this but still cant get my head around it. How can this be done?

Answer 1

There is no such thing as an ArrayList<byte>. When you declare one, you get an ArrayList<Byte>. So there's no single function idiom for turning this into byte[]. You'll have to allocate the byte[] and then write a loop to copy the values.

Or, you could use the fastutil library which does have a container like ArrayList that stores byte and which can yield an array.