Re: switch using strings

From:
"Mike Schilling" <mscottschilling@hotmail.com>
Newsgroups:
comp.lang.java.programmer
Date:
Tue, 1 Mar 2011 07:47:44 -0800
Message-ID:
<ikj4f4$4o4$1@news.eternal-september.org>
"Lew" <noone@lewscanon.com> wrote in message
news:ikiena$6uk$1@news.albasani.net...

On 03/01/2011 03:53 AM, Ian wrote:

On 20/02/11 21:24, Dirk Bruere at NeoPax wrote:

...which obviously won't work.
I have a series of packets coming in with a header that contains a
message name in text. I need to find a neat way to do a kind of switch
statement on the message name. Any ideas?


How about representing the strings as enums, I believe you can switch on
them?


Indeed you can, Ian, and you can even use enums for a pseudo
"switch-on-string".

Supplement 'valueOf(String)' with your own static 'fromString(String)' (or
similar) for "friendly" strings.

  switch ( YourEnum.fromString( choiceString ) )
  { ... }

This is preferable to switching on strings even when that becomes
available.

The majority of "new" Java features (for both 7 and 8) are just such
pretty wrapping paper on things already possible in Java for those willing
to think and to type.


That applies to 1.5 as well, except for generics and covariant return types.

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