一个perl的面向对象编程例子

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基类是一个操作系统类

代码


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

代码


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;
}

代码


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();