go知识重新整理

Go/DesignPattern/strategy/strategy.go

@@ -0,0 +1,56 @@
+/**
+* @Author:zhoutao
+* @Date:2020/12/12 下午1:50
+* @Desc:
+ */
+
+package strategy
+
+import "fmt"
+
+//策略模式：定义一系列算法，让这些算法在运行时可以互换，使得算法分离，符合开闭原则
+
+type PaymentContext struct {
+	Name, CardID string
+	Money        int
+}
+
+func NewPayment(name, cardID string, money int, strategy PaymentStrategy) *Payment {
+	return &Payment{
+		context: &PaymentContext{
+			Name:   name,
+			CardID: cardID,
+			Money:  money,
+		},
+		strategy: strategy,
+	}
+}
+
+type Payment struct {
+	context  *PaymentContext
+	strategy PaymentStrategy
+}
+
+func (p *Payment) Pay() {
+	p.strategy.Pay(p.context)
+}
+
+type PaymentStrategy interface {
+	Pay(*PaymentContext)
+}
+
+//by cash
+type Cash struct {
+}
+
+func (*Cash) Pay(ctx *PaymentContext) {
+	fmt.Printf("Pay $%d to %s by cash", ctx.Money, ctx.Name)
+}
+
+//by Bank
+type Bank struct {
+}
+
+func (*Bank) Pay(ctx *PaymentContext) {
+	fmt.Printf("Pay $%d to %s by Bank", ctx.Money, ctx.Name)
+}

Go/DesignPattern/strategy/strategy_test.go

@@ -0,0 +1,20 @@
+/**
+* @Author:zhoutao
+* @Date:2020/12/12 下午2:06
+* @Desc:
+ */
+
+package strategy
+
+func ExamplePayByCash() {
+	payment := NewPayment("ad", "808490523", 900, &Cash{})
+	payment.Pay()
+	//Output:
+	//Pay by cash
+
+}
+
+func ExamplePayByBank() {
+	payment := NewPayment("tom", "345782345", 900, &Bank{})
+	payment.Pay()
+}