The structure of the three methods that implement the interface under the sort package can call the method to sort
Len() int
Less(i, j int) bool
Swap(i, j int)
// Package sort provides primitives for sorting slices and user-defined
// collections.
package sort
// A type, typically a collection, that satisfies sort.Interface can be
// sorted by the routines in this package. The methods require that the
// elements of the collection be enumerated by an integer index.
type Interface interface {
// Len is the number of elements in the collection.
Len() int
// Less reports whether the element with
// index i should sort before the element with index j.
Less(i, j int) bool
// Swap swaps the elements with indexes i and j.
Swap(i, j int)
}
for example:
package main
import (
"fmt"
"math/rand"
"sort"
)
//声明Hero结构体
type Hero struct {
Name string
Age int
}
//声明一个Hero结构体切片类型
type HeroSlice []Hero
//切片实现Interface 接口的三个方法
//1.Len() ：返回切片的大小
func (hs HeroSlice) Len() int {
return len(hs)
}
//2.Less(i, j int) :决定使用什么规则进行排序
func (hs HeroSlice) Less(i, j int) bool {
return hs[i].Age < hs[j].Age // 按Hero的Age从小到大排序
//return hs[i].Name > hs[j].Name // 按Hero的Name从大到小排序
}
//3.Swap(i, j int) :Less(i, j int)返回true时进行交换
func (hs HeroSlice) Swap(i, j int) {
hs[i], hs[j] = hs[j], hs[i]
}
func main() {
//----------------------------- 基本类型切片排序 -------------------------------
var intSlice = []int{
0, -1, 10, 7, 90}
//使用系统提供的方法
sort.Ints(intSlice)
fmt.Println(intSlice)
//----------------------------- 结构体切片排序 --------------------------------
var heroes HeroSlice
//初始化切片
for i := 0; i < 10; i++ {
hero := Hero{
Name: fmt.Sprintf("英雄%d", rand.Intn(100)),
Age: rand.Intn(100),
}
heroes = append(heroes, hero)
}
//排序前的顺序
fmt.Println("-----------排序前------------")
for _, v := range heroes {
fmt.Println(v)
}
//结构体实现了排序Interface接口,可以调用sort.Sort进行结构体排序
sort.Sort(heroes)
fmt.Println("-----------排序后------------")
//看看排序后的顺序
for _, v := range heroes {
fmt.Println(v)
}
}
operation result:
[-1 0 7 10 90]
-----------排序前------------
{
英雄81 87}
{
英雄47 59}
{
英雄81 18}
{
英雄25 40}
{
英雄56 0}
{
英雄94 11}
{
英雄62 89}
{
英雄28 74}
{
英雄11 45}
{
英雄37 6}
-----------排序后------------
{
英雄56 0}
{
英雄37 6}
{
英雄94 11}
{
英雄81 18}
{
英雄25 40}
{
英雄11 45}
{
英雄47 59}
{
英雄28 74}
{
英雄81 87}
{
英雄62 89}
Process finished with exit code 0
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