Path: csiph.com!x330-a1.tempe.blueboxinc.net!usenet.pasdenom.info!gegeweb.org!eternal-september.org!feeder.eternal-september.org!.POSTED!not-for-mail
From: Gene Wirchenko <genew@ocis.net>
Newsgroups: comp.lang.java.programmer
Subject: Re: Something Better than ArrayList
Date: Tue, 21 Jun 2011 14:19:16 -0700
Organization: A noiseless patient Spider
Lines: 55
Message-ID: <jd2207949b23u2c20ea80cdqmer8i1515q@4ax.com>
References: <hoa007h62o1tas6h5p6qlls6i8i2nf9q84@4ax.com> <1337fe1a-2385-47c1-b966-9925f79d0ba3@j28g2000vbp.googlegroups.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 8bit
Injection-Info: mx04.eternal-september.org; posting-host="7Qrvczazr82YckO5XW8Vtw"; logging-data="18191"; mail-complaints-to="abuse@eternal-september.org";	posting-account="U2FsdGVkX19EuKWSAP0J9/JO3bcasVq4RGcnfJKaeG0="
X-Newsreader: Forte Agent 4.2/32.1118
Cancel-Lock: sha1:Xg6xVI5ZJT0ZKRbz42+Q0Y22lig=
Xref: x330-a1.tempe.blueboxinc.net comp.lang.java.programmer:5485

On Tue, 21 Jun 2011 02:22:46 -0700 (PDT), Paul Cager
<paul.cager@googlemail.com> wrote:

>On Jun 21, 6:34 am, Gene Wirchenko <ge...@ocis.net> wrote:
>> Dear Java'ers:
>>      The name of the class is what I need.  I assume I can find the
>> docs once I know what it is called.
>
>Others have already pointed you to java.util.Map, which answers your
>immediate question. You might also want to have a look at the Java
>"Collections" tutorial for more general information:
>http://download.oracle.com/javase/tutorial/collections/index.html

     I found it rather dry, but did manage to write a proof-of-concept
program for a symbol table.  However, I have to check for duplication
before put()ing.  Is there a way to combine a Map and a Set to avoid
this?

     For the Map

   static Map<String,String> SymbolTable=new HashMap<String,String>();

I would like to write something like

   static boolean TryToAdd
    (
    String theKey,
    String theData
    )
      {
      return SymbolTable.put(theKey,theData);
      }

instead of

   static boolean TryToAdd
    (
    String theKey,
    String theData
    )
      {
      if (SymbolTable.containsKey(theKey))
         return false;
      else
         {
         SymbolTable.put(theKey,theData);
         return true;
         }
      }

     Am I missing something or is this not supported?

Sincerely,

Gene Wirchenko