43. Automatic growth of StringBuilder capacity

• Code that shows how capacity automatically increases:

  
  StringBuilder name = new StringBuilder( 8 );
  int capacity1 = name.capacity();   // capacity1 is 8
  name.append( "Raymond R. Thomas" );
  int length = name.length();        // length is 17
  int capacity2 = name.capacity();   // capacity2 is 18 
                                     // (2 * capacity1 + 2)