学习Go语言之简单工厂模式

1.首先定义接口

1 package strategy
2 
3 type ICompute interface {
4     Compute(a, b int) int
5 }

2.接着两个接口实现类。

1 package strategy
2 
3 type Add struct {
4 }
5 
6 func (p *Add) Compute(a, b int) int {
7     return a + b
8 }

1 package strategy
2 
3 type Sub struct {
4 }
5 
6 func (p *Sub) Compute(a, b int) int {
7     return a - b
8 }

3.声明一个工厂类

package strategy

// 用户自己希望工厂产出
func Factory(s string) ICompute {
    var computer ICompute
    switch s {
    case "+":
        computer = new(Add)
        break
    case "-":
        computer = new(Sub)
        break
    }
    return computer
}

4.客户端调用

package main

import (
    "fmt"
    "myProject/strategy"
)

func main() {
    c := strategy.Factory("-")
    fmt.Println(c.Compute(15, 8))
}