go语言方法实例

方便和函数的区别：

方法能给用户定义的类型添加新的行为。方法实际上也是函数，只是在声明时，在关键字func 和方法名之间增加了一个参数。

package main

import (
	"fmt"
)

//define a use struct
type user struct {
	name  string
	email string
}

//notyfy user recieve a method
func (u user) notify() {
	fmt.Printf("Sending User Email to %s<%s>\n",
		u.name,
		u.email)
}

//changeEmail user make a method with pointer
func (u *user) changeEmail(email string) {
	u.email = email
}

//main is the entry of the program
func main() {
	bill := user{"Bill", "bill@email.com"}
	bill.notify()

	lisa := &user{"Lisa", "lisa@email.com"}
	lisa.notify()

	bill.changeEmail("bill@newdomain.com")
	bill.notify()

	lisa.changeEmail("lisa@newdomain.com")
	lisa.notify()

}