ruby中使用设计模式中的简单工厂模式和工厂方法模式-百家乐凯发k8

# -*- encoding: utf-8 -*-
#运算类
class operation
 attr_accessor :number_a,:number_b
 
 def initialize(number_a = nil, number_b = nil)
  @number_a = number_a
  @number_b = number_b
 end
 
 def result
  0
 end
end
#加法类
class operationadd < operation
 def result
  number_a   number_b
 end
end
#减法类
class operationsub < operation
 def result
  number_a - number_b
 end
end
#乘法类
class operationmul < operation
 def result
  number_a * number_b
 end
end
#除法类
class operationdiv < operation
 def result
  raise '除数不能为0' if number_b == 0 
  number_a / number_b
 end
end
#工厂类
class operationfactory
 def self.create_operate(operate)
  case operate
  when ' '
   operationadd.new()
  when '-'
   operationsub.new()
  when '*'
   operationmul.new()
  when '/'
   operationdiv.new()
  end
 end
end
oper = operationfactory.create_operate('/')
oper.number_a = 1
oper.number_b = 2
p oper.result

# -*- encoding: utf-8 -*-
#运算类
class operation
 attr_accessor :number_a,:number_b
 
 def initialize(number_a = nil, number_b = nil)
  @number_a = number_a
  @number_b = number_b
 end
 
 def result
  0
 end
end
#加法类
class operationadd < operation
 def result
  number_a   number_b
 end
end
#减法类
class operationsub < operation
 def result
  number_a - number_b
 end
end
#乘法类
class operationmul < operation
 def result
  number_a * number_b
 end
end
#除法类
class operationdiv < operation
 def result
  raise '除数不能为0' if number_b == 0 
  number_a / number_b
 end
end
module factorymodule
 def create_operation
 end
end
#加法工厂
class addfactory
 include factorymodule
 
 def create_operation
  operationadd.new
 end 
end
#减法工厂
class subfactory
 include factorymodule
 
 def create_operation
  operationsub.new
 end
end
#乘法工厂
class mulfactory
 include factorymodule
 
 def create_operation
  operationmul.new
 end 
end
#除法工厂
class divfactory
 include factorymodule
 
 def create_operation
  operationdiv.new
 end 
end
factory = addfactory.new
oper = factory.create_operation
oper.number_a = 1
oper.number_b = 2
p oper.result