String.intern() (Was: create a string of <n> equal chars <c>)

Daniel Pitts <>
Wed, 14 Jul 2010 13:57:58 -0700
On 7/14/2010 9:42 AM, Kevin McMurtrie wrote:

In article<>,
  Roedy Green<> wrote:

On 13 Jul 2010 15:01:35 GMT, Andreas Leitgeb
<> wrote, quoted or indirectly quoted
someone who said :

It seems so basic that I can't believe such a feature wasn't in
the standard library:

it is part of the common11 tools for JDK 1.1+

The method is called StringTools.rep

      * Produce a String of a given repeating character.
      * @param c the character to repeat
      * @param count the number of times to repeat
      * @return String, e.g. rep('*',4) returns "****"
      * @noinspection WeakerAccess,SameParameterValue
     public static String rep( char c, int count )
         if ( c == ' '&& count<= SOMESPACES.length() )
             return SOMESPACES.substring( 0, count );
         char[] s = new char[count];
         for ( int i = 0; i< count; i++ )
             s[ i ] = c;
         return new String( s ).intern();

      * used to efficiently generate Strings of spaces of varying
     private static final String SOMESPACES = " ";

Why use intern() on the second case? It's has always been undocumented
where the pool storage is and what the cost of using it is. The only
time I use that method is when generating keys for a Properties class.

Why even use it there? I don't think I've ever seen a legitimate case
for using intern(). The *closest* I've seen to a valid use is someone
wanted to use it for synchronization based on a String key.

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