Golang学习笔记_26——通道
Golang学习笔记_27——单例模式
Golang学习笔记_28——工厂方法模式

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工厂方法模式（实例）

package factory_method_demoimport "fmt"// Order 接口，定义订单的基本操作
type Order interface {CalculateTotal() float64Display()
}// RegularOrder 是普通订单结构体
type RegularOrder struct {Items  []stringPrices []float64
}// CalculateTotal 计算普通订单的总价
func (o *RegularOrder) CalculateTotal() float64 {var total float64for _, price := range o.Prices {total += price}return total
}// Display 显示普通订单信息
func (o *RegularOrder) Display() {fmt.Println("Regular Order:")for i, item := range o.Items {fmt.Printf("Item %d: %s, Price: %.2f\n", i+1, item, o.Prices[i])}fmt.Printf("Total Price: %.2f\n", o.CalculateTotal())
}// PromotionOrder 是促销订单结构体
type PromotionOrder struct {Items    []stringPrices   []float64Discount float64
}// CalculateTotal 计算促销订单的总价
func (o *PromotionOrder) CalculateTotal() float64 {var total float64for _, price := range o.Prices {total += price}return total * (1 - o.Discount)
}// Display 显示促销订单信息
func (o *PromotionOrder) Display() {fmt.Println("Promotion Order:")for i, item := range o.Items {fmt.Printf("Item %d: %s, Price: %.2f\n", i+1, item, o.Prices[i])}fmt.Printf("Total Price (after discount): %.2f\n", o.CalculateTotal())
}// OrderCreator 是订单创建者接口，包含工厂方法 CreateOrder
type OrderCreator interface {CreateOrder(items []string, prices []float64, discount ...float64) Order
}// RegularOrderCreator 是普通订单创建者结构体
type RegularOrderCreator struct{}// CreateOrder 创建普通订单
func (roc *RegularOrderCreator) CreateOrder(items []string, prices []float64, discount ...float64) Order {return &RegularOrder{Items:  items,Prices: prices,}
}// PromotionOrderCreator 是促销订单创建者结构体
type PromotionOrderCreator struct{}// CreateOrder 创建促销订单，支持折扣参数
func (poc *PromotionOrderCreator) CreateOrder(items []string, prices []float64, discount ...float64) Order {var disc float64if len(discount) > 0 {disc = discount[0]} else {disc = 0}return &PromotionOrder{Items:    items,Prices:   prices,Discount: disc,}
}func test2() {// 创建普通订单regularCreator := &RegularOrderCreator{}regularOrder := regularCreator.CreateOrder([]string{"Item1", "Item2"}, []float64{100.0, 200.0})regularOrder.Display()// 创建促销订单promotionCreator := &PromotionOrderCreator{}promotionOrder := promotionCreator.CreateOrder([]string{"Item3", "Item4"}, []float64{150.0, 250.0}, 0.1)promotionOrder.Display()
}

测试方法

func Test_test2(t *testing.T) {test2()
}

输出结果

=== RUN   Test_test2
Regular Order:
Item 1: Item1, Price: 100.00
Item 2: Item2, Price: 200.00
Total Price: 300.00
Promotion Order:
Item 1: Item3, Price: 150.00
Item 2: Item4, Price: 250.00
Total Price (after discount): 360.00
--- PASS: Test_test2 (0.00s)
PASS