Re: How would I rewrite this to satisfy the code checker?

Tom Anderson <>
Sat, 7 Nov 2009 12:57:31 +0000
On Fri, 6 Nov 2009, Lew wrote:

Lew wrote:

There's nothing wrong with writing the 'readLine()' assignment twice,
that is what purchases the scope confinement for the 'line' variable.

Tom McGlynn wrote:

For me duplication of code is almost always inelegant and even
slightly dangerous. There's always the chance that there could be
unintended inconsistencies between the two instances--especially when
code gets modified. I make no claim that this is a massive issue, but
neither is the suggested change very large.

Copy-and-paste avoids divergence of the duplicated expressions.

Since I don't have a problem with the idiom the OP wrote about, I usually do

for ( String line; (line = reader.readLine()) != null; )

This limits the scope of 'line', avoids curly-brace explosion and avoids
unnecessary duplication of code, much like your proposed 'while' syntax
except that it's legal.

I like that.

If you had this:

You could write:

import static LineIterator.lines;

for (String line: lines(reader)) {

However, you would throw away your ability to see exceptions, and there's
a bit more runtime overhead.


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