2021/9/26ATM机的存取款

Posted 2021-09-27 yifaer_chen

1.ATM（和用户交互）属性：银行        行为：展示菜单

代码:

package com.stx.oop.feature;

import java.util.Scanner;

public class ATM {
    Bank bank = new Bank();
    public static void main(String[] args) {
        ATM atm = new ATM();
        atm.display();
    }
    public void display() {
        Scanner scanner = new Scanner(System.in);
        while(true){
            System.out.println("按1开户");
            System.out.println("按2转账");
            System.out.println("按3查询");
            System.out.println("按0退出");
            String input=scanner.next();
            if ("0".equals(input)){
                System.out.println("bye！");
                break;
            }
            switch (input){
                case "1":
                    System.out.println("输入卡号");
                    String id=scanner.next();
                    System.out.println("输入用户名");
                    String name=scanner.next();
                    System.out.println("放入纸币");
                    Double balance=scanner.nextDouble();
                    bank.createAccount(id,name,balance);
                    break;
                case "2":
                    System.out.println("请输入付款账号");
                    String fromId = scanner.next();
                    System.out.println("请输入转账卡号");
                    String toId = scanner.next();
                    System.out.println("请输入转账金额");
                    Double money=scanner.nextDouble();
                    bank.transfer(fromId,toId, money);
                    break;
                case "3":
                    bank.queryAll();
                    break;
                default:
                    System.out.println("输入错误，请重新输入！");
                    break;
            }
        }
    }

}

2.银行    属性：所有账户   行为：开户、转账、查询所有用户
代码：

package com.stx.oop.feature;

public class Bank {
    private Account[] accounts = new Account[10];
    private int count = 0;
    public void createAccount(String id, String name, double balance) {
        // 创建账户对象
Account account = new Account();
        account.setBalance(balance);
        account.setName(name);
        account.setId(id);
        accounts[count] = account;
        count++;
    }
    // 转账
public void transfer(String fromId, String toId, double money) {
        // 找到对应的账号
Account from = findByAccount(fromId);
        // 找到付款用户信息
Account to = findByAccount(toId);
        // 账号余额变化
double fromBalance = from.getBalance();
        if (money > 0 && fromBalance - money > 0) {
            // 转账成功
from.setBalance(fromBalance - money);
            double toBalance = to.getBalance();// 钱存进收款账户
to.setBalance(toBalance + money);
        } else {
            System.out.println("转账失败");
            return;
        }
    }
        // 查询
public void queryAll(){
            for (int i = 0; i < accounts.length; i++) {
                Account account = accounts[i];
                if (account != null) {
                    account.show();
                }
            }
        }
    //查询用户
private Account findByAccount(String id) {
        for (int i = 0; i < accounts.length; i++) {
            Account account = accounts[i];
            if (account != null && account.getId().equals(id)) {
                return account;
            }
        }
        return null;
    }

}

package com.stx.oop.feature;

import java.util.Scanner;

public class ATM {
    Bank bank = new Bank();
    public static void main(String[] args) {
        ATM atm = new ATM();
        atm.display();

    }

    public void display() {
        Scanner scanner = new Scanner(System.in);
        while(true){
            System.out.println("按1开户");
            System.out.println("按2转账");
            System.out.println("按3查询");
            System.out.println("按0退出");
            String input=scanner.next();
            if ("0".equals(input)){
                System.out.println("bye！");
                break;
            }
            switch (input){
                case "1":
                    System.out.println("输入卡号");
                    String id=scanner.next();
                    System.out.println("输入用户名");
                    String name=scanner.next();
                    System.out.println("放入纸币");
                    Double balance=scanner.nextDouble();
                    bank.createAccount(id,name,balance);
                    break;
                case "2":
                    System.out.println("请输入付款账号");
                    String fromId = scanner.next();
                    System.out.println("请输入转账卡号");
                    String toId = scanner.next();
                    System.out.println("请输入转账金额");
                    Double money=scanner.nextDouble();
                    bank.transfer(fromId,toId, money);
                    break;
                case "3":
                    bank.queryAll();
                    break;

                default:
                    System.out.println("输入错误，请重新输入！");
                    break;
            }
        }
    }

}

3.账户   属性：卡号、名称、余额    行为：展示信息、设置余额
代码：

package com.stx.oop.feature;

public class Account {
    private String id;
    private String name;
    private double balance;
    // 访问途径就是方法
    public void show(){
        // 语法格式
        System.out.printf("卡号:%s\\t姓名:%s\\t余额:%f\\r\\n",id,name,balance);
    }
    // 存钱取钱
    public void setBalance(double balance){
        this.balance=balance;
    }
    public Double getBalance(){
        return balance;
    }
    // 开户
    public void setName(String name){
        this.name=name;
    }
    public String getName(){
        return name;
    }
    // 卡号
    public void setId(String id){
        this.id = id;
    }
    public String getId(){
        return id;
    }
}