go 使用注意: 变量名不能和包名相同,否则会 冲突了

目录结构

user/user.go

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package user


type User struct{
	Username string
	Sex string
	Age int
	AvatarUrl string
}


func NewUser(username string, sex string, age int,avatar string) *User{
	// 如果对象比较大比较多,不用指针类型的话会产生拷贝,占用较多内存, 性能会很差,所以一般会选择指针类型
	// 指针方式一,
	/*user1 :=&User{
		Username: username,
		Sex:sex,
		Age:age,
		AvatarUrl:avatar,
	}*/

	// 指针方式二,
	user := new(User)
	user.Username = username
	user.Sex = sex
	user.Age = age
	user.AvatarUrl = avatar
	return user
}

user/user_test.go

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package main

import (
	"../user"
	"fmt"
)


func main(){
	/*var user user.User  // 变量名不能和包名相同,否则会 冲突了
	user.age =18
	fmt.Printf("user=%#v\n",user)*/

	var user1 user.User  // 变量名不能和包名相同,否则会 冲突了
	user1.Age =18
	fmt.Printf("user1=%#v\n",user1)

	user2 := user.NewUser("user01","女",15,"xxx.jpg")
	fmt.Printf("user2=%#v\n",user2)
}

输出:

user1=user.User{Username:"", Sex:"", Age:18, AvatarUrl:""}
user2=&user.User{Username:"user01", Sex:"女", Age:15, AvatarUrl:"xxx.jpg"}