Listing main byte stream classes should include

two class hierarchies: one for input and one for output
two abstract classes at the top of each class hierarchy (from which are derived concrete subclasses that handle details of reading from and writing to various devices):

Listing character stream classes should include

two class hierarchies: one for input and one for output
two abstract classes, at the top of input and output hierarchies, whose concrete subclasses operate on Unicode character streams:

In general, the character-based classes parallel the byte-based classes.