定义接口
package main
import "fmt"
type Shaper interface {
Area() float32
}
type Square struct {
side float32
}
func (sq *Square) Area() float32 {
return sq.side * sq.side
}
func main() {
sq1 := new(Square)
sq1.side = 5
var areaIntf Shaper
areaIntf = sq1
fmt.Printf("The square has area: %f\n", areaIntf.Area())
}
定义接口-多态
package main
import "fmt"
type Shapers interface {
Area() float32
}
type Squares struct {
side float32
}
func (sq *Squares)Area()float32 {
return sq.side * sq.side
}
type Rectangle struct {
length, width float32
}
func (r Rectangle)Area()float32 {
return r.length * r.width
}
func main() {
r := Rectangle{5, 3}
q := &Squares{5}
shapes := []Shapers{r, q}
for n, _ := range shapes {
fmt.Println("Shape details: ", shapes[n])
fmt.Println("Area of this shape is: ", shapes[n].Area())
}
}
