基于Java编写的简易ATM系统

package demo_ATM; import java.util.ArrayList; import java.util.Random; import java.util.Scanner; public class ATM { private ArrayList<Account> accountsnew =new ArrayList<>(); private Account loginacc;//记录登录后的用户账户 private Scanner sc=new Scanner(System.in); //ATM启动系统 public void start(){ while (true) { System.out.println("====欢迎您进入ATM系统==="); System.out.println("1.用户登录"); System.out.println("2.用户开户"); System.out.println("请选择:"); int command=sc.nextInt(); switch (command){ case 1: //用户登录 login(); break; case 2: createAccount(); //用户开户 break; default: System.out.println("您输入的操作有误请重新输入!"); break; } } } private void createAccount(){ Account acc=new Account(); System.out.println("请您输入您的账户名称:"); String name=sc.next(); acc.setUserName(name); while (true) { System.out.println("请输入您的性别:"); char sex=sc.next().charAt(0); if (sex=='男'||sex=='女') { acc.setSex(sex); break; } else { System.out.println("您的性别输入有误，只能是男或者女--"); } } while (true) { System.out.println("请您输入您的账户密码:"); String passWord=sc.next(); System.out.println("请您输入您的确认密码:"); String okPassWord=sc.next(); if (okPassWord.equals(passWord)){ acc.setPassWord(passWord); break; } else { System.out.println("您输入的两次密码不一致,请您确认一次--"); } } System.out.println("请你输入您的取款限额:"); double limit=sc.nextDouble(); acc.setLimit(limit); String newCardId=createCardId(); acc.setCardId(newCardId); accountsnew.add(acc); System.out.println("恭喜您，"+acc.getUserName()+"开户成功,您的卡号是:"+acc.getCardId()); } /** 返回8位数卡号且不重复*/ private String createCardId(){ while (true) { String cardId=""; Random r=new Random(); for (int i=0;i<8;i++){ int data=r.nextInt(10); cardId+=data; } Account acc=getAccountByCardId(cardId); if (acc==null){ return cardId; } } } private Account getAccountByCardId(String cardId){ for (int i = 0; i < accountsnew.size(); i++) { Account acc=accountsnew.get(i); if (acc.getCardId().equals(cardId)){ return acc; } } return null; } private void login(){ System.out.println("==系统登录=="); //系统不存在对象时 if (accountsnew.size()==0){ System.out.println("该系统无任何用户，请先开户!"); return ; } while (true){ System.out.println("请您输入您的登录卡号:"); String cardId=sc.next(); Account acc=getAccountByCardId(cardId); if (acc==null) { System.out.println("您输入的登录账号不存在，请确定--"); } else { while (true){ System.out.println("请输入登录密码:"); String passWord=sc.next(); if (acc.getPassWord().equals(passWord)){ loginacc=acc; System.out.println("恭喜您，"+acc.getUserName()+"成功登录了系统,您的卡号是:"+acc.getCardId()); showUSerCommand(); return; } else { System.out.println("您输入的密码有误，请确认！"); } } } } } private void showUSerCommand(){ while (true) { System.out.println(loginacc.getUserName()+"您可以选择以下功能进行处理==="); System.out.println("1.查询账户"); System.out.println("2.存款"); System.out.println("3.取款"); System.out.println("4.转账"); System.out.println("5.密码修改"); System.out.println("6.退出"); System.out.println("7.注销当前账户"); int command=sc.nextInt(); switch (command){ case 1: showLoginAccount(); break; case 2: depositMoney(); break; case 3: dropMoney(); break; case 4: transferMoney(); break; case 5: updatePassWord(); return; case 6: return; case 7: if ( deleteAccount()) { return; } break; default: System.out.println("请重新输入操作数!"); break; } } } private void showLoginAccount(){ System.out.println("---当前您的账户信息如下---"); System.out.println("卡号:"+loginacc.getCardId()); System.out.println("户主:"+loginacc.getUserName()); System.out.println("性别:"+loginacc.getSex()); System.out.println("余额:"+loginacc.getMoney()); System.out.println("每次取款额度:"+loginacc.getLimit()); } private void depositMoney(){ System.out.println("---存钱操作---"); System.out.println("请输入存款金额:"); double money=sc.nextDouble(); loginacc.setMoney(loginacc.getMoney()+money); System.out.println("恭喜您，存钱："+money+"成功，存钱后金额是:"+loginacc.getMoney()); } private void dropMoney(){ System.out.println("==取钱操作=="); if (loginacc.getMoney()<100){ System.out.println("您的账户余额不足100元，不允许取钱"); } System.out.println("请输入取款金额:"); double money=sc.nextDouble(); if (loginacc.getMoney()>=money){ if (money>loginacc.getLimit()){ System.out.println("您当前取款金额超过了每次限额,您每次最多可取："+loginacc.getLimit()); }else{ loginacc.setMoney(loginacc.getMoney()-money); System.out.println("您取款"+"成功"+"取款后剩余:"+loginacc.getMoney()); } }else { System.out.println("余额不足，您的账户中的余额是:"+loginacc.getMoney()); } } private void transferMoney() { System.out.println("--用户转账--"); if (accountsnew.size()<2){ System.out.println("当前系统中只有一个账户，无法为其他账户转账--"); return; } if (loginacc.getMoney()==0){ System.out.println("您自己都没钱就别转了---"); return; } while (true) {