Re: "final" in "for"

From:

Lew <lew@lewscanon.com>

Newsgroups:

comp.lang.java.programmer

Date:

Thu, 10 Dec 2009 11:52:11 -0800 (PST)

Message-ID:

<119a72fa-0862-4b79-bc57-03b1fab1737f@j24g2000yqa.googlegroups.com>

Wojtek wrote:

If this does come about, final is fine.

Though one could STILL monkey about:

int inc = 1;
for (final int i = 0; i < s.length(); i += inc)
{
  inc = 1;
  char ch = s.charAt(i);

  if (ch != '\')
  {
    out.write(ch);
  }
  else
  {
    out.write(mapEscapeChar(s.charAt(i + 1)));
    inc = 2;
  }

}

The question arises whether 'final' would apply to all declared loop
variables:

  for ( int inc = 1, i = 0; i < s.length(); i += inc)
vs.
  for ( final int inc = 1, i = 0; i < s.length(); i += inc)

I'd find it useful to allow multiple loop-variable declarations:

public static void copy( Reader reader, Writer writer ) throws
IOException
{
  for ( final int bufz = 8192, final char line = new char [bufz], int
bread;
         (bread = reader.read( line )) > 0;
         writer.write( line, 0, bread )
       )
  {}
}

which would mean

public static void copy( Reader reader, Writer writer ) throws
IOException
{
  final int bufz = 8192;
  final char line = new char [bufz];
  for ( int bread;
         (bread = reader.read( line )) > 0;
         writer.write( line, 0, bread )
       )
  {}
}

--
Lew