TODO: flesh this out.

Java incorporated support for UTF16, roughly along the lines of what ICU had done although with a number of omissions requiring work-arounds. The following provides a mapping between the corresponding APIs.

ICU	JDK
UTF16.charAt(myString, offset)	myString.codePointAt(offset)
UTF16.valueOf(codePoint)	new StringBuilder().appendCodePoint(codePoint).toString()
UTF16.getCharCount(codePoint)	Character.charCount(codePoint)