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1.Factory
ºÍ Abstract Factory
class
 Factory  
  attr_accessor :product
  
  def
 produce  
    @product
.new
  
  end
  
end
  
class
 Product  
  #..
  
end
  
fac = Factory.new
  
fac.product = Product  
fac.produce  
class Factory
attr_accessor :product
def produce
@product.new
end
end
class Product
#..
end
fac = Factory.new
fac.product = Product
fac.produce
JavaдµÄ¹¤³§ÓÐÕâô¼òµ¥£¬ÕâôÈÝÒ×ÖØÓÃô£¿
2.Builder
# ¹¤Í·
  
class
 Director  
  def
 build_with builder  
    acc = ''
  
    [:header
, :body
, :footer
].each
 do
 |m|  
      acc += builder.__send__ m if
 builder.respond_to? m  
    end
  
    acc  
  end
  
end
  
# ¹¤ÈË
  
class
 HTMLBuilder  
  def
 header; '<html><title>html builder</title>'
;end
  
  def
 body;   '<body>html builder</body>'
        ;end
  
  def
 footer; '</html>'
                          ;end
  
end
 


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