// DotsAndDollars_16_9.java  (c) 2005 Kari Laitinen

//  http://www.naturalprogramming.com

//  2004-09-14  File created.
//  2005-05-15  Last modification.

//  A solution to exercise 16-9.

import  java.util.* ;

class  ThreadToPrintCharacters  extends  Thread
{
   boolean  thread_must_be_executed  =  true ;

   char  character_to_print ;
   long  interval_between_printings ;

   ThreadToPrintCharacters( char given_character_to_print,
                            int  given_interval_between_printings )
   {
      character_to_print  =  given_character_to_print ;
      interval_between_printings  =  given_interval_between_printings ;
   }


   public void stop_this_thread()
   {
      thread_must_be_executed  =  false ;
   }


   public void run()
   {
      while ( thread_must_be_executed  ==  true )
      {
         try
         {
            Thread.sleep( interval_between_printings ) ; 
         }
         catch ( InterruptedException caught_exception )
         {
         }
      
         System.out.print( " "  +  character_to_print ) ;
      }
   }
}



class DotsAndDollars_16_9
{
   public static void main( String[] not_in_use )
   {
      Scanner keyboard = new Scanner( System.in ) ;

      ThreadToPrintCharacters  thread_to_print_dots  =
                    new  ThreadToPrintCharacters( '.', 1000 ) ;
      ThreadToPrintCharacters  thread_to_print_dollar_signs  =
                    new  ThreadToPrintCharacters( '$', 4050 ) ;
      thread_to_print_dots.start() ;
      thread_to_print_dollar_signs.start() ;

      System.out.print( "\n Press the Enter key to stop the program. \n\n" ) ;

      String  any_string_from_keyboard  =  keyboard.nextLine() ;

      thread_to_print_dots.stop_this_thread() ;
      thread_to_print_dollar_signs.stop_this_thread() ;
   }
}