perl哈希的一个示例解析

#!/bin/perl
use strict; 
use warnings; 

my %movies; 
my $film; 
my %reverse_result; 
my $director; 
my @data; 

%movies = 
( 
  'The Shining'       => 'Kubrick', 
  'Ten Commandments'  => 'DeMille', 
  'Goonies'           => 'Spielberg', 
); 

#输出哈希的值，输出的结果为Kubrick 
print $movies{'The Shining'}; 

#同时输出键和值 
foreach $film(keys %movies) 
{ 
   print "$film was directed by $movies{$film}.\n"; 
} 

#添加空格 
print "\n"; 

#哈希结构的切换 
%reverse_result=reverse %movies; 
foreach $director(keys %reverse_result) 
{ 
   print "$director directe the $reverse_result{$director}.\n";  
}

#添加空格 
print "\n";

#当哈希结构用于列表环境中时，perl会将hash重新变为由关键词和键值组成的普通列表 
@data=%movies; 
 print "@data\n"; 

#添加空格 
print"\n"; 

#得到的数组是一个分为奇数为film，偶数为director的数组，或者相反 
#然后我们将数组赋值给hash 
%movies=@data; 
foreach $director(keys %reverse_result) 
{ 
  print "$director directe the $reverse_result{$director}.\n";  
}     
print "The result is not change\n";