DataOutputStream.writeUTF runs through its argument String twice using 
String.charAt.  Instead, it could use String.getChars to get the chars 
into a local char[] and then walk that (twice).  This would save two 
calls to String.charAt per char, and would avoid the explicit range 
checks that String.charAt does.  One hopes this change would allow a 
good compiler to elide the subscript range checks on the array access, 
etc. generating generally better code.

One might want to avoid the extra char[] if the argument String were 
very long, to avoid running out of memory.

peter.kessler@Eng 1998-11-19