//  PlaytimeModified.java (c) 2005 Kari Laitinen

//  http://www.naturalprogramming.com

//  2005-06-21  File created.
//  2005-06-21  Last modification.

//  WARNING!  It may be better not to run this program
//  for a long time on your computer because the infinite
//  loop of the program consumes quite a lot of processing
//  power, and that may result in that the electronics 
//  of your computer gets too hot. In my computer the cooling
//  fan of the processor starts operating immediately when
//  I start executing this program.

import java.util.* ;

class  ThreadToDisplayTicksAndTime  extends  Thread
{
   boolean  must_display_ticks_and_time   =  true ;

   public void stop_this_thread()
   {
      must_display_ticks_and_time  =  false ;
   }

   public void run()
   {
      long  previous_time_ticks,  current_time_ticks ;
      long  loop_counter  =  0 ;

      System.out.print(
        "\n   nanoseconds  current_time_ticks        Readable time \n" ) ;

      previous_time_ticks  =  System.currentTimeMillis() ;

      while ( must_display_ticks_and_time  ==  true )
      {
         loop_counter  ++  ;

         current_time_ticks  =  System.currentTimeMillis() ;

         if ( ( current_time_ticks  -  previous_time_ticks )  >  5000  &&
              ( ( current_time_ticks  /  1000 ) %  5 )  ==  0 ) 
         {
            double  time_to_execute_the_loop_once  =

            ( ( (double) ( current_time_ticks  -
                                   previous_time_ticks ) ) * 1000000.0 )

                    / (double) loop_counter ;

            //  %12.4 says that the number is shown with 4 decimals.

            System.out.printf( "\n   %12.4f", time_to_execute_the_loop_once ); 
            System.out.print(  "     "  + current_time_ticks  +  "      " ) ;
            System.out.printf( "%tc",  current_time_ticks  )  ;

            previous_time_ticks  =  current_time_ticks ;
            loop_counter   =  0 ;
         }
      }
   }
}

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

      ThreadToDisplayTicksAndTime thread_to_display_ticks_and_time  = 
                                        new ThreadToDisplayTicksAndTime() ;

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

      thread_to_display_ticks_and_time.start() ;

      String  any_string_from_keyboard  =  keyboard.nextLine() ;

      thread_to_display_ticks_and_time.stop_this_thread() ;
   }
}