一个perl的面向对象编程例子

基类是一个操作系统类

 

package os;
require Exporter;
@ISA = qw(Exporter);
@EXPORT = qw(temp);

sub getDF{}

sub temp{
 my $this = shift;
 print $this->getDF();
 print "\n";
}

sub new{
 my $class =shift;
 my $this = {};
 bless $this,$class;
 return $this;
}

1;

 

 

 

两个子类分别是sunos和hpos

 

package hpos;
require Exporter;
require os;
@ISA = qw(Exporter os);
@EXPORT= qw();

my %cmd =(
'df' => 'bdf -l',
'ps' => 'ps -efx'
);

sub getDF{
        return $cmd{'df'};
}

sub new{
 my $class =shift;
 my $this = os->new();
 bless $this,$class;
 return $this;
}

 

 

 

package sunos;
require Exporter;
require os;
@ISA = qw(Exporter os);
@EXPORT= qw();

my %cmd =(
'df' => 'df -kl',
'ps' => 'ps -ef'
);

sub getDF{
        return $cmd{'df'};
}

sub new{
 my $class =shift;
 my $this = os->new();
 bless $this,$class;
 return $this;
}

1;

 

 

对象创建工厂

 

package factory;

sub createOS{
        my $self=shift;
        my $os = shift;
        return new sunos if ($os eq 'sun');
        return new hpos if ($os eq 'hp');
}

sub createDB{
}
1;

 

客户端程序

 

#!/usr/bin/perl
push(@INC,`pwd`);
use sunos;
use hpos;
use factory;
$os = factory->createOS('hp');
$os ->temp();

$os = factory->createOS('sun');
$os->temp();