Re: Problems generating names for instancevariables in a vector

From:
Ratnesh Maurya <ratneshmaurya@gmail.com>
Newsgroups:
comp.lang.java.programmer
Date:
Tue, 12 May 2009 20:36:17 -0700 (PDT)
Message-ID:
<73cc022d-74c5-4bc0-a254-2d13046f7371@18g2000prx.googlegroups.com>
On May 12, 7:21 pm, Lew <l...@lewscanon.com> wrote:

On May 12, 9:50 am, iMo...@live.se wrote:

Hello guys. I wanted to wright something that filled a vector with
objects of the same type. Sins I don't know how many objects there is
going to be beforehand I wanted some way to generate names for them
when they are created. I tried something like the algorithm below but
it's not working. Any help or suggestions would be welcome and thanks
in advance.

   public class Board {

        public int numSquares;
        Square[] sq = {};

        public void mksquares(int k){


The method name does not adhere to the Java naming conventions, which
call for camel case in variable and method names, starting with a
lower-case letter. Also, there is no good reason to be so terse with
the name.

            for (int i = 0; i < k; i++){
                Square genName("Sq", i) = new Square(=

); // "here is

the rub"


This is not legal Java syntax. A variable name must follow the rules,
which do not include parentheses, quotes, commas or spaces.

You can associate a name with an object by including it as an
attribute of the object, or by using a map such as 'Map <String,
Square>', that maps the name to the object. In fact, maps are a
standard way to implement associative arrays in Java.

            }


Try something like this (no more complete than the OP code):

 private static final String PREFIX = "square";
 public Map <String, Square> makeSquares( int k )
 {
  Map <String, Square> squares = new HashMap <String, Square> ();
  for ( int i = 0; i < k; i++ )
  {
    squares.put( PREFIX + i, new Square() );
  }
  return squares;
 }

--
Lew


I Agree with Lew and the map implementation suggested here is best for
this scenario :)

Regards,
-Ratnesh
S7 Software

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