package main

import (
	"fmt"
	"math/rand"
	"sort"
)

type Student struct {
	Name string
	Age  int
	Id   string
}
type StudentArray []Student

func (stu StudentArray) Len() int {
	return len(stu)
}
func (stu StudentArray) Less(i, j int) bool {
	return stu[i].Age > stu[j].Age
}
func (stu StudentArray) Swap(i, j int) {
	stu[i], stu[j] = stu[j], stu[i]
}

//SortByInterface sort.Sort里面调用的是一个接口，只要结构实现了接口的方法Len、Less、Swap
//就可以使用
func SortByInterface() {
	var stua StudentArray
	for i := 0; i < 10; i++ {
		var stu Student = Student{
			Name: fmt.Sprintf("stu%d", rand.Intn(10)),
			Age:  rand.Intn(100),
			Id:   fmt.Sprintf("110%d", rand.Intn(100000)),
		}
		stua = append(stua, stu)
	}
	fmt.Println("Before Sort")
	for _, val := range stua {
		fmt.Println(val)
	}
	fmt.Println("After Sort")
	sort.Sort(stua)
	for _, val := range stua {
		fmt.Println(val)
	}
}

type Reader interface {
	Read()
}
type Writer interface {
	Write()
}
type ReadWrite interface { //接口的嵌套
	Reader
	Writer
}
type Lock interface {
	Lock()
	Unlock()
}
type File struct {
	Name string
}

func (f *File) Write() {
	fmt.Printf("My name is %s\n", f.Name)
}
func (f *File) Read() {
	fmt.Printf("I am reading data\n")
}
func Test(rw ReadWrite) {
	rw.Write()
	rw.Read()
}
func Test1(rw ReadWrite) {
	rw.Read()
	rw.Write()
}
func testInterface() {
	var f *File = &File{
		Name: "golang",
	}
	Test1(f)
}
func main() {
	// SortByInterface()
	testInterface()

}