小型银行账户

​ 银行的账户记录Account有账户的唯一性标识（11个长度的字符和数字的组合），用户的姓名，开户日期(Date)，账户密码（六位的数字，可以用0开头），当前的余额。银行规定新开一个账户时，银行方面提供一个标识符、账户初始密码123456，客户提供姓名，开户时客户可以直接存入一笔初始账户金额，不提供时初始余额为0。定义该类，并要求该类提供如下方法：存款、取款、变更密码、可以分别查询账户的标识、姓名、开户日期、当前余额等信息。

package ch09;

import java.util.Scanner;

public class Test {
    public static void main(String[] args) {
        Account user = new Account();
        while (true){
            System.out.println("请输入办理业务功能(1.开户 2.查看当前用户信息 3.存款 4.取款 5.设置密码 6.退出系统)");
            Scanner input = new Scanner(System.in);
            int num = input.nextInt();
            switch (num){
                case 1:
                    user.init();
                    System.out.println("用户创建成功");
                    break;
                case 2:
                    user.detail();
                    break;
                case 3:
                    System.out.print("请输入存款金额:");
                    double balance = input.nextDouble();
                    user.deposit(balance);
                    break;
                case 4:
                    System.out.print("请输入取款金额:");
                    balance = input.nextDouble();
                    user.withdrawMoney(balance);
                    break;
                case 5:
                    user.setPassword();
                    break;
                case 6:
                    System.out.println("系统已退出");
                    System.exit(0);
            }

        }
    }
}

package ch09;
import java.util.Date;
import java.util.Scanner;

public class Account {
    private String id;
    private String name;
    private Date date;
    private int password;
    private double balance;

    public Account() {
        password = 123456;
        id = "ab123456789";
        this.balance = 0;
        this.date = new Date();
    }

    public Account(String name, double balance) {
        password = 123456;
        id = "ab123456789";
        this.name = name;
        this.balance = balance;
        this.date = new Date();
    }

    public String getId() {
        return id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Date getDate() {
        return date;
    }

    public double getBalance() {
        return balance;
    }

    // 初始化账户
    public void init(){
        Scanner input = new Scanner(System.in);
        System.out.print("请输入姓名:");
        this.name = input.next();
        System.out.print("请输入存入金额:");
        this.balance = input.nextDouble();
    }

    // 账户信息
    public void detail(){
        System.out.printf("开户日期为:%s\n", getDate());
        System.out.printf("当前用户id为:%s\n", getId());
        System.out.printf("当前用户的名字为:%s\n", getName());
        System.out.printf("当前余额为%f\n", getBalance());
    }

    // 存款
    public void deposit(double balance) {
        if(balance <= 0){
            System.out.println("存款的钱不能小于等于0");
        }else {
            this.balance += balance;
            System.out.println(this.balance);
            System.out.printf("成功存入%.2f元, 存款后的余额为%.2f元\n", balance, this.balance);
        }

    }

    // 取款
    public void withdrawMoney(double balance){
        if(balance > this.balance){
            System.out.printf("余额不足, 无法取出, 当前余额为%f\n", this.balance);
        }else if(balance < 0){
            System.out.println("取出的钱不能小于0");
        }else {
            this.balance -= balance;
            System.out.printf("成功取出%.2f元, 剩余余额为%.2f元\n", balance, this.balance);
        }
    }

    // 变更密码
    public void setPassword(){
        System.out.print("请输入当前密码:");
        Scanner input = new Scanner(System.in);
        int password = input.nextInt();
        if(this.password != password){
            System.out.println("输入的密码有误, 请重新输入");
        }else {
            System.out.print("请输入新密码:");
            int password1 = input.nextInt();
            System.out.print("请再次输入新密码:");
            int password2 = input.nextInt();
            if (password1 == password2){
                this.password = password1;
                System.out.println("修改密码成功");
            }
        }
    }
}