golang之interface(接口)与 reflect 机制

 1 package main
 2 
 3 import "fmt"
 4 
 5 type Human struct {
 6 name string
 7 age int 
 8 phone string
 9 }
 10 
 11 type Student struct {
 12 Human //匿名函数
 13 school string
 14  loan float32
 15 }
 16 
 17 type Employee struct {
 18  Human
 19 company string
 20  money float32
 21 }
 22 
 23 //Human对象实现Sayhi方法
 24 func (h *Human) Sayhi() {
 25 fmt.Printf("hi, I am %s you can call me on %s\n", h.name, h.phone)
 26 }
 27 
 28 //Human对象实现了Sing方法
 29 func (h *Human) Sing(lyrics string) {
 30 fmt.Println("lalala...", lyrics)
 31 }
 32 
 33 //Human对象实现了Guzzle方法
 34 func (h *Human) Guzzle(beerStein string) {
 35 fmt.Println("Guzzle Guzzle...", beerStein)
 36 }
 37 
 38 //Student 实现了BorrowMoney方法
 39 func (s *Student) BorrowMoney(amount float32) {
 40 s.loan += amount
 41 }
 42 
 43 //Empolyee 重载了Human的Sayhi的方法
 44 func (e *Employee) Sayhi() {
 45 fmt.Printf("hi, I am %s, I work at %s. call me on %s\n", e.name, e.company, e.phone)
 46 }
 47 
 48 //Employee实现了SpendSalary的方法
 49 func (e *Employee) SpendSalary(amount float32) {
 50 e.money -= amount
 51 }
 52 
 53 //define interface
 54 /*
 55 type Men interface {
 56  Sayhi()
 57  Sing(lyrics string)
 58  Guzzle(beerStein string)
 59 }
 60 
 61 type YoungChap interface {
 62  Sayhi()
 63  Sing(song string)
 64  BorrowMoney(amount float32)
 65 }
 66 
 67 type ElderlyGent interface {
 68  Sayhi()
 69  Sing(song string)
 70  SpendSalary(amount float32)
 71 }
 72 */
 73 
 74 //interface Men被Human,Student, Employee都实现
 75 // Student, Employee包含了Human匿名字段,所有也包含了其接口实现
 76 type Men interface {
 77  Sayhi()
 78 Sing(lyrics string)
 79 }
 80 
 81 func main() {
 82 mike := Student{Human{"Mike", 24, "22-22-xx"}, "MIT", 0.00}
 83 paul := Student{Human{"paul", 26, "23-32-xx"}, "Harvard", 5.00}
 84 sam := Employee{Human{"Sam", 46, "33-33-33"}, "Gling inc", 1000}
 85 Tom := Employee{Human{"Tom", 33, "33-334-11"}, "Things ltd", 400}
 86 
 87 var i Men //interface type
 88 i = &mike
 89 fmt.Println("this is Mike, a Student\n")
 90  i.Sayhi()
 91 i.Sing("my name is Mike")
 92 
 93 i = &Tom
 94 fmt.Println("this is Tom, an employee\n")
 95  i.Sayhi()
 96 i.Sing("my name is Tom")
 97 
 98 x := make([]Men, 3)
 99 x[0], x[1], x[2] = &paul, &sam, &mike
100 for _, value := range x {
101  value.Sayhi()
102  }
103 }

 1 package main
 2 
 3 import (
 4 "fmt"
 5 "reflect"
 6 )
 7 
 8 func main() {
 9 var x float64 = 3.4
10 p := reflect.ValueOf(&x)
11 v := p.Elem()
12  fmt.Println(v)
13 v.SetFloat(8.3)
14  fmt.Println(v)
15 }

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