Perl–面向对象编程中的属性
在 Perl 中，面向对象的概念非常基于引用和数组/散列。相对于 Perl 编程，面向对象编程的几个主要术语是对象、类和方法。
- In Perl, the object is like a reference to a data type that knows which class it belongs to. Object is stored as a reference in a scalar variable. Because scalar only contains references to objects, it can even hold different objects in different classes.
- In Perl, the package containing the corresponding methods needed to create and manipulate objects is called class .
- In Perl, method is a subroutine defined in the package. The package name or object reference is the first parameter of the method, depending on whether the method affects the current class or object.
属性
每个类都可以定义属性。当我们将它们表示为对象时，我们为这些属性赋值。例如，甚至每个“文件”对象都有一个路径。属性也称为属性。
属性通常定义为只读或读写。只读属性只能在创建对象时设置，而读写属性可以随时更改。一个属性值本身可以是另一个对象。并不是每个类都必须有属性和方法。
Perl 没有特殊的属性语法。在后面，属性通常作为键存储在对象的底层散列中。
Perl
sub new{
my ($class, $args) = @_;
my $self = bless { serial => $args->{serial},
name => $args->{name},
price => $args->{price}
}, $class;
}
