date.pm

PERL语言资料 可以用于PERL程序设计

#!/usr/bin/perl
# Fig. 14.4: Date.pm
# A simple Date class.

package Date;

use strict;
use warnings;

sub new 
{
   my $date = { the_year => 1000,
                the_month => 1,
                the_day => 1, };

   bless( $date );
   return $date;
}

sub year
{
   my $self = shift();

   $self->{ the_year } = shift() if ( @_ );
   
   return $self->{ the_year };
}

sub month
{
   my $self = shift();
   
   $self->{ the_month } = shift() if ( @_ );
   
   return $self->{ the_month };
}

sub day
{
   my $self = shift();
   
   $self->{ the_day } = shift() if ( @_ );
   
   return $self->{ the_day };
}

sub setDate
{
   if ( @_ == 4 ) {
      my $self = shift();
      $self->month( $_[ 0 ] );
      $self->day( $_[ 1 ] );
      $self->year( $_[ 2 ] );
   }
   else {
      print( "Method setDate requires three arguments.\n" );
   }
}

sub print
{
   my $self = shift();
   print( $self->month );
   print( "/" );
   print( $self->day );
   print( "/" );
   print( $self->year );
}

return 1;

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