代理模式

需求：

小明讓小李替他追小麗（送洋娃娃，送花，送巧克力）

沒有代理的代碼：

# -*- encoding: utf-8 -*-#追求者類class Pursuit attr_accessor :mm  def initialize(mm)  @mm = mm end  def give_dolls  puts "#{mm.name} 送你洋娃娃" end  def give_flowers  puts "#{mm.name} 送你鮮花" end  def give_chocolate  puts "#{mm.name} 送你巧克力" endend#被追求者類class Girl attr_accessor :name  def initialize(name)  @name = name endendxiao_hong = Girl.new('小紅')xiao_ming = Pursuit.new(xiao_hong)xiao_ming.give_dollsxiao_ming.give_flowersxiao_ming.give_chocolate

只有代理的代碼：

# -*- encoding: utf-8 -*-#代理類class Proxy attr_accessor :mm  def initialize(mm)  @mm = mm end  def give_dolls  puts "#{mm.name} 送你洋娃娃" end  def give_flowers  puts "#{mm.name} 送你鮮花" end  def give_chocolate  puts "#{mm.name} 送你巧克力" endend#被追求者類class Girl attr_accessor :name  def initialize(name)  @name = name endendxiao_hong = Girl.new('小紅')xiao_ming = Proxy.new(xiao_hong)xiao_ming.give_dollsxiao_ming.give_flowersxiao_ming.give_chocolate

只是把追求者類換成了代理類。

實際的代理模式代碼：

# -*- encoding: utf-8 -*-#公共接口modulemodule GiveGift def give_dolls end  def give_flowers end  def give_chocolate endend#追求者類class Pursuit include GiveGift attr_accessor :mm, :name  def initialize(mm)  @mm = mm end  def give_dolls  puts "#{mm.name} 替#{name}送你洋娃娃" end  def give_flowers  puts "#{mm.name} 替#{name}送你鮮花" end  def give_chocolate  puts "#{mm.name} 替#{name}送你巧克力" endend#代理類class Proxy include GiveGift attr_accessor :gg  def initialize(mm)  @gg = Pursuit.new(mm) end  def give_dolls  gg.give_dolls end  def give_flowers  gg.give_flowers end  def give_chocolate  gg.give_chocolate endend#被追求者類class Girl attr_accessor :name  def initialize(name)  @name = name endendxiao_hong = Girl.new('小紅')xiao_ming = Proxy.new(xiao_hong)xiao_ming.gg.name = '小明'xiao_ming.give_dollsxiao_ming.give_flowersxiao_ming.give_chocolate

裝飾模式
 
需求：

給人搭配不同的服飾

代碼版本一

# -*- encoding: utf-8 -*-class Person attr_accessor :name  def initialize(name)  @name = name end  def wear_t_shirts  puts '大T恤' end  def wear_big_trouser  puts '垮褲' end  def wear_sneakers  puts '破球鞋' end  def wear_suit  puts '西裝' end  def wear_tie  puts '領帶' end  def wear_leather_shoes  puts '皮鞋' end  def show  puts "*****裝扮的#{name}/n/n" endendxc=Person.new('小菜')puts "******第一種裝扮"xc.wear_t_shirtsxc.wear_big_trouserxc.wear_sneakersxc.showputs "******第二種裝扮"xc.wear_suitxc.wear_tiexc.wear_leather_shoesxc.show