52 lines
983 B
Go
52 lines
983 B
Go
package main
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import "fmt"
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/*
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实例：
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汤宝宝成为了收银员，消费者可以使用现金或者支付宝支付。
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*/
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type Strategy interface {
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Pay(amount float64) string
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}
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type CashPayment struct{}
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func (c *CashPayment) Pay(amount float64) string {
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return fmt.Sprintf("使用现金支付了 %.2f 元", amount)
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}
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type AlipayPayment struct{}
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func (a *AlipayPayment) Pay(amount float64) string {
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return fmt.Sprintf("使用支付宝支付了 %.2f 元", amount)
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}
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type Context struct {
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strategy Strategy
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}
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func (c *Context) SetStrategy(strategy Strategy) {
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c.strategy = strategy
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}
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func (c *Context) Pay(amount float64) string {
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return c.strategy.Pay(amount)
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}
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func main() {
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fmt.Println("=========== 策略模式 ===========")
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context := &Context{}
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context.SetStrategy(&CashPayment{})
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fmt.Println(context.Pay(100))
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context.SetStrategy(&AlipayPayment{})
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fmt.Println(context.Pay(200))
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fmt.Println()
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fmt.Println("========= 策略模式结束 =========")
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}
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