1、結構體的巢狀一

package main
import "fmt"

type Person struct {
	name string
}

type Student struct {
	class int
	person Person         //定義person 型別為Person
}


func main(){
	s := Student{1,Person{"xiaoming"}}
	fmt.Println("name :",s.person.name)  //訪問嵌入結構體的變數

}

//執行結果：
//name : xiaoming

2、結構體的巢狀二

package main
import "fmt"

type Person struct {
	name string
}

type Student struct {
	class int
	Person          //我們直接將Person引入到Student
}


func main(){
	s := Student{1,Person{"xiaoming"}}
	fmt.Println("name :",s.name)  //訪問時可以直接訪問s.name 而不需要s.person.name

}

//執行結果：
//name: xiaoming
 

3、介面巢狀(定義)

定義介面，在go語言中，介面是定義了型別一系列方法的列表，如果一個型別實現了該介面所有的方法，那麼該型別就符合該介面

package main

import "fmt"
import "math"


type Shape interface {
	area() float64

}

type Rectangle struct {
	width float64
	height float64
}

type Circle struct {
	radius float64
}

func (r Rectangle) area() float64 {
	return r.height * r.width
}

func (c Circle) area() float64 {
	return math.Pi * math.Pow(c.radius,2)
}

func getArea(shape Shape) float64 {
	return shape.area()
}

func main(){
	r := Rectangle{20,10}
	c := Circle{4}
	fmt.Println("Rectangle Area =",getArea(r))
	fmt.Println("Circle Area =",getArea(c))

}

//執行結果：
//Rectangle Area = 200
//Circle Area = 50.26548245743669
 

4、介面巢狀

package main

import "fmt"
import "math"


type Shape interface {
	area() float64

}

type MultiShape interface {
	Shape            //嵌入式
}

type Rectangle struct {
	width float64
	height float64
}

type Circle struct {
	radius float64
}

func (r Rectangle) area() float64 {
	return r.height * r.width
}

func (c Circle) area() float64 {
	return math.Pi * math.Pow(c.radius,2)
}

func getArea(shape MultiShape) float64 {        //改為MultiShape
	return shape.area()
}

func main(){
	r := Rectangle{20,10}
	c := Circle{4}
	fmt.Println("Rectangle Area =",getArea(r))
	fmt.Println("Circle Area =",getArea(c))

}

//執行結果：
//Rectangle Area = 200
//Circle Area = 50.26548245743669        //執行結果一致