Go结构体方法

package main

import "fmt"

type Person struct {
   Name string
   Age int
}
func (p Person) say(){
   fmt.Printf("I am %s and %d years old\n",p.Name,p.Age)
}
func main(){
   var p Person
   p.Name = "aaa"
   p.Age = 11
   var p2 Person
   p2.Name = "bbb"
   p2.Age = 22
   // 调用实例方法
   p.say() // I am aaa and 11 years old
   p2.say() //I am bbb and 22 years old
}

package main

import (
   "fmt"
)
type Student struct {
   Name string
   Age int
   Skills []string
}
// 这里类似引用
func (s *Student)Learn(skill string) {
   // 通过学习,会一个技能
   // append 底层会自动make
   s.Skills = append(s.Skills,skill)
}
func (s Student) Show(){
   for _,skill := range s.Skills {
      fmt.Printf("I am %s,I am %d years old,and %sing is my skill\n",s.Name,s.Age,skill)
   }
}
func main(){
   var s1 Student
   s1.Name = "小明"
   s1.Age = 20
   s1.Learn("fish")
   s1.Learn("learn")
   var s2 Student
   s2.Name = "小红"
   s2.Age = 18
   s2.Learn("Sing")
   s2.Learn("paint")
   // 调用方法
   s1.Show()
   s2.Show()
   //I am 小明,I am 20 years old,and fishing is my skill
   //I am 小明,I am 20 years old,and learning is my skill
   //I am 小红,I am 18 years old,and Singing is my skill
   //I am 小红,I am 18 years old,and painting is my skill
}

package main

import "fmt"
type Student struct {
   Name string
   Age int
}
func (s Student) setName(){
   // 接收者为实例变量的副本,在方法内更改值不会影响原来的值
   s.Name = "aaaaaa"
}
func (s *Student) setAge(){
   // 接收者为实例变量地址的副本,在方法内更改值会改变原来的值
   s.Age = 21
}
func main(){
   var s1 Student
   var s2 Student
   s1.Name = "a"
   s1.Age = 10
   s2.Name = "b"
   s2.Age = 10
   s1.setName()
   fmt.Println(s1)// {a 10}
   s2.setAge()
   fmt.Println(s2) //{b 21}
}

package main

import "fmt"
type Student struct {
   Name string
   Age int
}
//也可以使用值类型调用此方法
func (s *Student) setName(){
   s.Name = "bbbb"
}
//也可以使用指针类型调用此方法
func (s Student) showName(){
   fmt.Println(s.Name)
}
// 默认fmt.Println 会调用此方法
func (s Student) String() string{
   return fmt.Sprintf("I am %s,i am %d years old",s.Name,s.Age)
}
func main(){
   var s Student
   s.Name = "a"
   s.Age = 20
   fmt.Println(s) // I am a,i am 20 years old
   s.setName() // 值类型的调用接收者为指针类型的方法
   s.showName() // bbbb
   fmt.Println(s) // I am bbbb,i am 20 years old
   var s1 *Student = new(Student)
   s1.Name = "b"
   s1.Age = 10
   fmt.Println(s1) // I am b,i am 10 years old
   s1.setName() //
   s1.showName() // bbbb 指针类型的调用接收者为值类型的方法
   // 在这里需要说一下
    // 标准的调用 方式应该是
    (*s1).showName()
    // Go 编译器在底层自动做了解引用,所以可以简化成s1.showName 
    // 总之,不管是指针接收者还是值接收者,统一使用实例.方法名就可以; 
   fmt.Println(s1) //I am bbbb,i am 10 years old
}