Re: changing array dimension in a method

From:
ram@zedat.fu-berlin.de (Stefan Ram)
Newsgroups:
comp.lang.java.programmer
Date:
11 Nov 2006 17:38:19 GMT
Message-ID:
<array-dimension-20061111183622@ram.dialup.fu-berlin.de>
"Daniel Malek" <daniel_malek001@hotmail.com> writes:

I have a two dimensional array (myArray) and need to change its dimensions


  You can not change the dimension of an array in the same
  sense that suggest that you can not change the value of
  the number 3.

  You can, however, create a new array with another dimension
  at run-time.

  The following example code shows how to create and populate an
  array, when the dimension becomes only known at run-time.

  In this example, an array with 3 dimensions of sizes 4, 5, and
  6, respectively, is created, filled, and printed.

public class Main
{
  public static int[] cdr( final int[] list )
  { return java.util.Arrays.copyOfRange( list, 1, list.length ); }

  public static java.lang.Object build( final int ... extensions )
  { final java.lang.Object array = java.lang.reflect.Array.newInstance
    ( java.lang.Integer.TYPE, extensions );
    for( int i = 0; i < extensions[ 0 ]; ++i )if( extensions.length > 1 )
    java.lang.reflect.Array.set( array, i, build( cdr( extensions )));
    else java.lang.reflect.Array.setInt(( int[] )array, i, i );
    return array; }

  public static void print( final java.lang.Object array )
  { for( int i = 0; i < java.lang.reflect.Array.getLength( array ); ++i )
    if( array.getClass().getName().startsWith( "[[" ))
    print( java.lang.reflect.Array.get( array, i )); else
    java.lang.System.out.print( java.lang.reflect.Array.getInt( array, i )); }

  public static void main( final java.lang.String[] args )
  { print( build( 4, 5, 6 )); }}

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