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CopyBytes seems like a normal program, but it actually represents a kind of low-level I/O that you should avoid. It has been mentioned that there are streams for characters ,objects etc that should be preferred although all are built on the bytestream itself. What is a reason behind this, has it anything to do with security manager and performance related issues?
source : oracle docs
It works, but is very inefficient: it needs 2 method calls for every single byte it copies.
Instead, you should use a buffer (of several thousand bytes, the best size varies by what exactly you read and other conditions) and read/write the entire buffer (or as much as possible) with every method call.