如何显示帐户列表并提示客户选择哪个特定帐户

Question

我已经在这个问题上坚持了3天多了。

在我的主类ATM中，方法为verifyCustomer()。登录时，我正试图找到一种方法，先询问客户ID。验证后，将列出客户帐户。之后，系统会提示客户选择要访问的帐户，然后提示客户输入帐号和密码。

我还有一个黄金账户类别，其中只有超过一定年龄的客户"；65〃；被允许打开选项。我在弄清楚如何在initialize()方法中访问它的逻辑时也遇到了问题。

我有Account超类的3个子类，由于已经有太多代码，所以我没有包括这些子类。

有什么建议吗？

ATM.java

public class ATM {
private InputReader reader;
private String accountNumber;
private String passcode;
private boolean customerVerified;
private String customerID;
private Bank theBank;
private Customer currentCustomer;
public ATM() {
super();
initialize();
run();
}

public static void main(String[] args) {
new ATM();
}
public void run() {
reader = new InputReader();
boolean exit = false;
while (!exit) {
System.out.println("Welcome to Bank");
System.out.println("Choose one of the following options");
System.out.println("1 - Sign In");
System.out.println("2 - Deposit");
System.out.println("3 - Withdraw");
System.out.println("4 - Display Account Info");
System.out.println("5 - Exit");
System.out.println(">");
int choice = reader.getIntInput();
switch (choice) {
case 1:
verifyCustomer();
break;
case 2:
transactDeposit();
break;
case 3:
transactWithdraw();
break;
case 4:
displayAccountInformation();
break;
case 5:
System.out.println("Thank you for banking at Bank");
System.exit(0);
}
}
}

public void initialize() {
Customer tom = new Customer("Tom", "Smith", "123",70,"A001");
Customer jane = new Customer("Jane", "Smith", "789",18,"A002");
Customer bob = new Customer("Bob", "Smith", "456",32,"A003");
Account tomChequing = new ChequingAccount("CH-123", 0.0,2);
Account tomSavings = new SavingsAccount("SA-123", 50.0);
Account tomGold = new GoldAccount("GL-123",50.0,2.0);
Account janeChequing = new ChequingAccount("CH-789",0.0,2);
Account janeSavings = new SavingsAccount("SA-789", 0.0);
Account bobChequings = new ChequingAccount("CH-456",0.0,5);
Account bobSavings = new SavingsAccount("SA-456", 100.0);
tom.addAccount(tomChequing);
tom.addAccount(tomSavings);
tom.addAccount(tomGold);
jane.addAccount(janeChequing);
jane.addAccount(janeSavings);
bob.addAccount(bobChequings);
bob.addAccount(bobSavings);
theBank = new Bank();
theBank.addCustomer(tom);
theBank.addCustomer(jane);
theBank.addCustomer(bob);
if(currentCustomer.getAge() >= 65) {
currentCustomer.
}
}

public void transactDeposit() {
if (customerVerified) {
System.out.println("Enter the amount to deposit: ");
currentCustomer.getAccountList().addToBalance(reader.getDoubleInput());
} else {
System.out.println("ERROR: You must LOGIN before you can perform a transaction.");
verifyCustomer();
}
}
public void transactWithdraw() {
if (customerVerified) {
System.out.println("Enter the amount to withdraw: ");
currentCustomer.getAccount().subtractFromBalance(reader.getDoubleInput());
} else {
System.out.println("ERROR: You must LOGIN before you can perform a transaction.");
verifyCustomer();
}
}
public void displayAccountInformation() {
if (customerVerified) {
System.out.println("Here is your information.");
System.out.println(currentCustomer.toString());
} else {
System.out.println("ERROR: You must LOGIN before you can perform a trasnsaction.");
verifyCustomer();
}
}
public void verifyCustomer() {
System.out.println("Enter your Customer ID");
customerID = reader.getStringInput();
System.out.println("Which account do you want to access?");
System.out.println("Enter Account Number: ");
accountNumber = reader.getStringInput();
System.out.println("Enter your passcode");
passcode = reader.getStringInput();
currentCustomer = Bank.theBank.get(accountNumber);
if (currentCustomer != null) {
if (passcode.equals(currentCustomer.getPasscode()) && customerID.equals(currentCustomer.getCustomerID())) {
customerVerified = true;
} else {
System.out.println("ERROR: Either account number, customer id, or passcode is not correct.");
run();
}
} else {
System.out.println("ERROR: Either account number, customer id, or passcode is not correct.");
run();
}
}
}

Customer.java

import java.util.ArrayList;
public class Customer {
private String firstName;
private String lastName;
private String passcode;
private int age;
private String customerID;
private ArrayList<Account> accounts;
public Customer(String firstName, String lastName, String passcode, int age, String customerID) {
setFirstName(firstName);
setLastName(lastName);
setPasscode(passcode);
setAge(age);
setCustomerID(customerID);
accounts = new ArrayList<>();
}
public void addAccount(Account account) {
accounts.add(account);
}
public ArrayList<Account> getAccountList() {
return accounts;
}
public void setAccountList(ArrayList<Account> account) {
this.accounts = account;
}
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
if (firstName != null && !firstName.trim().isEmpty()) {
this.firstName = firstName;
}
}
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
if (lastName != null && !lastName.trim().isEmpty()) {
this.lastName = lastName;
}
}
public String getPasscode() {
return passcode;
}
public void setPasscode(String passcode) {
if (passcode != null && !passcode.trim().isEmpty()) {
this.passcode = passcode;
}
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public String getCustomerID() {
return customerID;
}
public void setCustomerID(String customerID){
this.customerID = customerID;
}
}

Account.java

import java.util.ArrayList;
public class Account {
private String accountNumber;
private double balance;
private boolean active;
protected ArrayList<String> transactionInfo;
public Account() {
super();
}
public Account(String accountNumber, double balance) {
super();
if(accountNumber != null) {
this.accountNumber = accountNumber;
}
setBalance(balance);
active = true;
transactionInfo = new ArrayList<String>();
}
public String getAccountNumber() {
return accountNumber;
}
public double getBalance() {
return balance;
}
public boolean isActive() {
return active;
}
public void setBalance(double balance) {
if(balance >= 0){
this.balance = balance;
}
}
public void setActive(boolean active) {
this.active = active;
}
public void addToBalance(double amount) {
if (amount > 0) {
balance += amount;
}
}
public void subtractFromBalance(double amount) {
if (amount > 0) {
balance -= amount;
}
}
public void addTransactionInfo(String info) {
if(info != null) {
transactionInfo.add(info);
}
}
public void displayAccountRecords() {
if(transactionInfo != null) {
for(String info: transactionInfo) {
System.out.println(info);
}
}
}
}

Bank.java

import java.util.HashMap;
public class Bank {
public static HashMap<String, Customer> theBank;
public Bank() {
super();
theBank = new HashMap<>();
}
public void addCustomer(Customer newCustomer) {
if (newCustomer != null) {
theBank.put(newCustomer.getCustomerID(), newCustomer);
}
}
// use the customerID to access their collection of accounts
public void closeAccount(String customerID, String accountNumber) {
Customer c = theBank.get(customerID);
if(c != null) {
for(Account a: c.getAccountList()) {
if(accountNumber.equals(a.getAccountNumber())) {
theBank.remove(accountNumber);
}
}
//if (theBank.containsKey(customerID)) {
//theBank.get(customerID).getAccountList().remove(accountNumber);
}
}
public static void displayCustomerInformation(Customer customer){
if(customer != null){
System.out.println(customer);
}
}
public static void displayAllCustomers(){
for(Customer customer : theBank.values()){
System.out.println(customer);
}
}
}

Answer 1

类Bank中有一个HashMap，映射键是客户ID。只需在类Bank中添加getCustomer(String)方法即可。

public Customer getCustomer(String id) {
return theBank.get(id);
}