原型模式(Prototype)

名字: 原型模式(Prototype)
意图: 用原型实例指定创建对象的种类, 并且通过[b]拷贝[/b]这些原型创建新的对象.
动机: 替换较复杂的等级结构的工厂方法.

class ScreenPrototype
  attr_accessor :width, :height

  def initialize(width, height)
    self.width = width
    self.height = height
  end

  def display(name)
    puts "#{name} screen: #{self.width} x #{self.height}"
  end
end

class Client
  def self.run
    h = {}
    h[:normal] = ScreenPrototype.new(1024, 768)
    h[:tft_lcd] = ScreenPrototype.new(1280, 800)

    name = :normal
    new = h[name].clone
    new.display(name)
  end
end

Client.run

[img]http://dl.iteye.com/upload/attachment/195740/8e94461a-e53d-3430-bedd-96231df39674.jpg[/img]