Java language implements basic operations of bank ATM system

#ATM system

##Function

Simulated bank ATM machine system, with registration and login functions
After logging in, the user can achieve the following functions:
1) Deposit 2 ) Withdrawal 3) Transfer 4) Inquiry 5) Exit

##Design ideas

First of all, to operate an ATM machine, you should have a bank card and an ATM, so we need to design an ATM class and Bankcard Class, ATM has operations such as deposits and withdrawals, and Bankcard is used to record user transactions after operations such as deposits and withdrawals. Secondly, because ATM serves multiple users at the same time, we should identify each card. Here, add a Bank class to record the bank The number of cards and which bank cards each user holds.

##Specific code

Bank class

import java.util.Arrays;

/**
 * @author:zl
 * @Date 22:30 2020/10/9
 */
 
public class Bank {
    private BankCard[] cards;
    private int size;// 有效用户个数
    private static final int INITSIZE  =10;
    public Bank(){
        this(INITSIZE);
    }
    public Bank(int num){
        cards = new BankCard[num];
    }
    public boolean add(BankCard card){//如果注册过，增加失败
        if(contains(card.getID(),card.getPasswd())!=null){
            return false;
        }
        if(size==cards.length){
            cards= Arrays.copyOf(cards,cards.length>>1);//长度不够时进行扩容
        }
        cards[size++] = card;//
        return true;
    }
    public boolean search(int id,int passwd){//查询是否存在这张卡
        boolean k=true;
        for(int i=0;i<size;i++){
            if((cards[i].getID()==id)&&(cards[i].getPasswd()==passwd)){
                k=true;
            }
            else k=false;
        }
        return k;
    }
    public BankCard contains(int id,int passwd){//查询并返回这张卡
        BankCard card=null;
        for(int i=0;i<size;i++){
            if((cards[i].getID()==id)&&(cards[i].getPasswd()==passwd)){
                card=cards[i];
                break;
            }
        }
        return card;
    }

}

Bankcard class

import java.util.Scanner;

public class BankCard {
    private int id;
    private int passwd;
    public int money=0;
    public  BankCard(int id,int passwd){
        this.id=id;
        this.passwd=passwd;
    }
    public int getID(){
        return this.id;
    }
    public int getPasswd(){
        return this.passwd;
    }
    /**
     * 存款
     */
    public void saveMoney(int money){
       this.money+=money;
    }
    /**
     * 取款
     */
    public boolean withDraw(int money){
        boolean flag=false;
       if(this.money>=money){
           this.money-=money;
           flag=true;
       }
            return flag;
    }
    /**
     * 返回余额
     * @return
     */
    public int  getMoney(){
        return this.money;
    }
}

ATM class###

import java.util.Scanner;
import src3.BankCard;

public class ATM {
    private Bank bank;
    private static Scanner scanner;
    public ATM(){
        bank = new Bank();
        scanner = new Scanner(System.in);
    }

    public void start(){
        while (true) {
            System.out.println("1. 登陆 2.注册 3.关机");
            int chioce = scanner.nextInt();
            if (chioce == 3) {
                break;
            }
            System.out.println("请输入账号密码");
            int id = scanner.nextInt();
            int passwd = scanner.nextInt();
            BankCard successCard = null;
            switch (chioce){
                case 1:
                    successCard = login(id,passwd);
                    if(successCard != null){
                        System.out.println("登陆成功");
                        loginSuccess(successCard);
                    }else{
                        System.out.println("登陆失败");
                    }
                    break;
                case 2:
                    if(regiter(id,passwd)){
                        System.out.println("注册成功");
                    }else{
                        System.out.println("注册失败");
                    }
                    break;
            }
        }
    }
    private void loginSuccess(BankCard successCard){
        while (true) {
            System.out.println("1. 存款 2.取款 3.转账 4.余额 5.退卡");
            int chioce = scanner.nextInt();
            if (chioce == 5) {
                break;
            }
            switch (chioce) {
                case 1:
                    System.out.println("请输入存款金额");
                    int money = scanner.nextInt();
                    successCard.saveMoney(money);
                    System.out.println("存款成功");
                    break;
                case 2:
                    System.out.println("请输入取款金额");
                    money = scanner.nextInt();
                    if (successCard.withDraw(money)) {
                        System.out.println("取款成功");
                    } else {
                        System.out.println("取款失败");
                    }
                    break;
                case 3:
                    System.out.println("请输入转账金额");
                    money = scanner.nextInt();
                    System.out.println("请输入转账用户账号，密码");
                    int id = scanner.nextInt();
                    int passwd = scanner.nextInt();
                    BankCard userCard = bank.contains(id, passwd);
                    if (userCard != null) {
                        if (successCard.withDraw(money)) {// 当前卡取款成功
                            userCard.saveMoney(money);
                            System.out.println("转账成功");
                        } else {
                            System.out.println("余额不足");
                        }
                    } else {
                        System.out.println("没有此用户");
                    }
                    break;
                case 4:
                    System.out.println("余额：" + successCard.getMoney());
                    break;
            }
        }
    }

    private boolean regiter(int id,int passwd){
        BankCard card = new BankCard(id,passwd);
        return bank.add(card);
    }
    private BankCard login(int id,int passwd){
        return bank.contains(id,passwd);
    }
}

# #####Test class###

public class TestDemo {
    public static void main(String[] args) {
        ATM atm = new ATM();
        atm.start();
    }
}

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