A DESCRIPTION OF THE REQUEST :
I feel that both byte and character stream copy should be included in the standard API

JUSTIFICATION :
This is a wheel I'm constantly re-inventing, and, as far as I can see, a pretty easy hole to fill.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
I would suggest you consider adding

int write(InputStream is) throws IOException;

Method to OutputStream and

int write(Reader r) throws IOException;

to Writer (both returning number of elements copied).

A generic copy method could be placed in the abstract classes, potentially with more optimal copies in derived classes (e.g. Buffered versions).
ACTUAL -
DIY, Of course it's only a few lines, but it's one of those things that get's done different ways all the time.