比如有一些不同的数据结构structs (Models),都有相同的函数,如(Update, Delete, Show),这时候应该引入interface。
如下面一个例子:
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package main
import "fmt"
type human struct {
something string
}
type animal struct {
whatever string
}
func (a *animal) Speak() string {
return a.whatever
}
func (h *human) Speak() string {
return h.something
}
type living interface {
Speak() string
}
func AnyMethod(l living) {
fmt.Println(l.Speak())
}
func main() {
fmt.Println("Hello, playground")
john := human{"I am john"}
tom := animal{"Bow Bow"}
AnyMethod(&john)
AnyMethod(&tom)
}
运行输出:
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Hello, playground
I am john
Bow Bow
再看一个例子加强印象:
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package main
import "fmt"
type A struct {
Value string
}
func (a *A) Read() string {
return a.Value
}
func (a *A) Write(s string) {
a.Value = s
}
type B struct {
Value string
}
func (b *B) Read() string {
return b.Value
}
func (b *B) Write(s string) {
b.Value = s
}
type ReadWriter interface {
Read() string
Write(s string)
}
func WriteRead(rw ReadWriter, s string) string {
rw.Write(s)
return rw.Read()
}
func main() {
a := A{}
b := B{}
fmt.Println(WriteRead(&a, "a: write"))
fmt.Println(WriteRead(&b, "b: write"))
}
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