* gnu/java/nio/FileChannelImpl.java
	(read): New implementation.
	(implRead): New methods.
	(write): New implementation, call other write insteal of read method.
	(implWrite): New methods.
	(map): Added comment.
	(transferFrom): Implemented.
	(transferTo): Implemented.
	(lock): Added checks to throw exceptions.
	(truncate): Added check to throw exception.
	* gnu/java/nio/natFileChannelImpl.cc
	(implRead): New method.
	(implWrite): New method.
	* java/nio/ByteBuffer.java
	(hashCode): Fixed comment.
	(get): Fixed exception documentation.
	(put): Fixed exception documentation.
	* java/nio/CharBuffer.java:
	Added comment for later optimizations.

From-SVN: r66373