建造者模式(Builder)

最新推荐文章于 2025-06-15 23:58:00 发布

原创最新推荐文章于 2025-06-15 23:58:00 发布 · 289 阅读

0 ·

CC 4.0 BY-SA版权

文章标签：

#class #算法 #工作

设计模式笔记专栏收录该内容

24 篇文章

订阅专栏

本文深入探讨了建造者模式的基本概念及其实现方式，并通过具体的代码示例对比了不同类型的建造者实现，帮助读者理解该模式如何应用于软件设计。

个人理解：

建造者模式与策略(stragety)模式比较类似，Director类有点类似于策略类，不同的是建造者模式会对Product分步建造完成。

UML类图

代码实现：

<span style="font-size:12px;">    public class Director
    {
        public Person BuildPerson(PersonBuilder personBuilder)
        {
            personBuilder.SetName();
            personBuilder.SetAge();
            return personBuilder.GetPerson();
        }
    }

    public class TomBuilder : PersonBuilder
    {
        public override void SetName()
        {
            this.person.Name = "Tom";
        }
        public override void SetAge()
        {
            this.person.Age = 19;
        }
    }

    public class JackBuilder : PersonBuilder
    {
        public override void SetName()
        {
            this.person.Name = "Jack";
        }
        public override void SetAge()
        {
            this.person.Age = 29;
        }
    }

    public struct Person
    {
        public string Name { get; set; }
        public int Age { get; set; }
    }</span>

python实现代码

class Product(object):
    ProductA=""
    ProductB=""

class Builder(object):
    product=Product()
    def BuildProductA(self):
        raise NotImplementedError("Abstract")
    def BuildProductB(self):
        raise NotImplementedError("Abstract")
    def GetProduct(self):
        return self.product

class ChinaBuilder(Builder):
    def BuildProductA(self):
        self.product.ProductA="A, made in China."
    def BuildProductB(self):
        self.product.ProductB="B, made in China."

class GermanBuilder(Builder):
    def BuildProductA(self):
        self.product.ProductA="A, made in German."
    def BuildProductB(self):
        self.product.ProductB="B, made in German."

'''class Director(object):
    __builder=None
    def SetBuilder(self, builder):
        self.__builder=builder
    def Build(self):
        self.__builder.BuildProductA()
        self.__builder.BuildProductB()
    def GetProduct(self):
        return self.__builder.GetProduct()

chinaBuilder=ChinaBuilder()
germanBuilder=GermanBuilder()

director=Director()
director.SetBuilder(chinaBuilder)
director.Build()
product=director.GetProduct()

print(product.ProductA)
print(product.ProductB)

director.SetBuilder(germanBuilder)
director.Build()
product=director.GetProduct()

print(product.ProductA)
print(product.ProductB)'''

class Director(object):
    __builder=None
    def BuildProduct(self, builder):
        self.__builder=builder
        self.__builder.BuildProductA()
        self.__builder.BuildProductB()
        return self.__builder.GetProduct()

chinaBuilder=ChinaBuilder()
germanBuilder=GermanBuilder()

director=Director()
product=director.BuildProduct(chinaBuilder)

print(product.ProductA)
print(product.ProductB)

product=director.BuildProduct(germanBuilder)

print(product.ProductA)
print(product.ProductB)