Golang struct structure object-oriented programming ideas - abstract understanding of abstraction

When we defined a structure earlier, we actually extracted the common attributes (fields) and behaviors (methods) of a type of thing to form a physical model (template) . This method of studying problems is called abstraction.

After you extract the attributes and behaviors of a type of thing, the next step is to embody the code. The following is a simulated bank card deposit and withdrawal method to check the balance.

package main

import "fmt"

type Account struct {
	AccountNum string
	Password   string
	Balance    float64
}

func (account *Account) Cunqian(money float64, password string) {
	if account.Password != password {
		fmt.Println("用户名密码错误！")
		return
	}
	if money < 0 {
		fmt.Println("输入的金额不正确！")
		return
	}

	account.Balance += money
	fmt.Println("存款成功！")
}

func (account *Account) Quqian(money float64, password string) {
	if account.Password != password {
		fmt.Println("用户名密码错误！")
		return
	}
	if money < 0 || money > account.Balance {
		fmt.Println("输入的金额不正确！")
		return
	}

	account.Balance -= money
	fmt.Println("取款成功！")
}

func (account *Account) Chaxunyuer(password string) {
	if account.Password != password {
		fmt.Println("用户名密码错误！")
		return
	}

	fmt.Println("当前余额:", account.Balance)
}

func main() {
	a := &Account{
		AccountNum: "123456",
		Password:   "123456",
		Balance:    0,
	}
	a.Cunqian(12.3, "123456")
	a.Chaxunyuer("123456")
	a.Quqian(10.2, "123456")
	a.Chaxunyuer("123456")

}


存款成功！
当前余额: 12.3
取款成功！
当前余额: 2.1000000000000014