//  AppendixADeclarations.java  (c) 2005 Kari Laitinen

//  http://www.naturalprogramming.com

//  2005-07-14  File created.
//  2005-07-14  Last modification.

//  Testing some of the declarations shown in Appendix A of the book.

//  The literals of Appendix A are tested in LiteralTests.java

import java.util.* ;


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

      char  character_from_keyboard ;
      short  given_small_integer ;
      int    integer_from_keyboard ;
      long   multiplication_result ;

      char  user_selection  =  '?' ;
      byte  mask_for_most_significant_bit  = (byte) 0x80 ;
      int   character_index  =  0 ;
      int   bit_mask   =  0x80000000 ;
      long  speed_of_light   =  299793000L ;
      float   kilometers_to_miles  = 1.6093F ;
      double  value_of_pi  =  3.14159 ;
      boolean  text_has_been_modified  =  false ;

      System.out.printf( "\n  %X",  mask_for_most_significant_bit ) ;

      final int  LENGTH_OF_NORMAL_YEAR  =  365 ;
      final int  LENGTH_OF_LEAP_YEAR    =  366 ;

      final double LENGTH_OF_YEAR_IN_SECONDS  =  31558149.5 ;
      final float EXACT_LENGTH_OF_YEAR_IN_DAYS  =  365.256F ;

      char[] array_of_characters ;
      array_of_characters  =  new  char[ 50 ] ;
      int[]  array_of_integers  =  new  int[ 60 ] ;
      int[]  integers_to_power_of_two =
               { 0, 1, 4, 9, 16, 25, 36, 49, 64, 81, 100, 121 } ;
      int[]  two_to_power_of_integer =
               { 1, 2, 4, 8, 16, 0x20, 0x40, 0x80, 0x100 } ;
      char[]  hexadecimal_digits  =
         { '0', '1', '2', '3', '4', '5', '6', '7',
           '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' } ;
      double[] pi_times_integer  =
           { 0, 3.1416, 6.2832, 9.4248, 12.5664 } ;
      float[] centimeters_to_inches  =
          { 0, 0.3937F, 0.7874F, 1.1811F, 1.5748F, 1.9685F};

      int[][]  some_two_dimensional_array  =  new int[ 5 ][ 9 ] ;

      System.out.print( "\n  "  +  some_two_dimensional_array[ 4 ][ 7 ] ) ;


      String  some_string  ;  // declares a string reference
      String  another_string  =  ""  ;  // an empty string
      String  third_string    =  "text inside string object" ;
  
      char[]  some_letters    =  { 'K', 'a', 'r', 'i' } ; 
      String  some_name       =  new  String( some_letters ) ;
      String  some_copied_string  =  new String( some_name ) ;

      System.out.print( "\n "  +  some_copied_string ) ;

      Date first_day_of_this_millennium = new Date( 1, 1, 2000 ) ;
      Date last_day_of_this_millennium = new Date("12/31/2999") ;

      Object  anything ;  // This can reference any object

      String[]  any_array_of_strings ; 

      String[]  array_of_strings   =  new  String[ 9 ] ;
      array_of_strings[ 0 ]  =  "some text line" ;
      array_of_strings[ 1 ]  =  "another text line" ;

      System.out.print( "\n array_of_strings[ 3 ] is "
                     +  array_of_strings[ 3 ] ) ;

      // The following is an initialized array of strings
      String[]  largest_moons_of_jupiter  =
                  { "Io", "Ganymede", "Europa", "Callisto" } ;

      Date[]  days_of_this_millennium  =  new  Date[ 365243 ] ;
      days_of_this_millennium[ 0 ]  =  new Date( 1, 1, 2000 ) ;
      days_of_this_millennium[ 1 ]  =  new Date( 2, 1, 2000 ) ;
      days_of_this_millennium[ 2 ]  =  new Date( 3, 1, 2000 ) ;

      //  I test here the working of the instanceof operator

      if ( some_name instanceof String )
      {
         System.out.print( "\n  true" ) ;  // the object is a String object
      }

      if ( some_name instanceof Object )
      {
         System.out.print( "  true" ) ;  //  String is a subclass of Object
      }

      if ( some_name instanceof Comparable ) 
      {
         System.out.print( "  true" ) ;  // String implements Comparable
      }
   }
}