用java实现银行存取款系统代码

以下是一个简单的Java银行存取款系统的实现代码，仅供参考：

Account.java:

public class Account {
    private String name;
    private String accountNumber;
    private double balance;

    public Account(String name, String accountNumber, double balance) {
        this.name = name;
        this.accountNumber = accountNumber;
        this.balance = balance;
    }

    public String getName() {
        return name;
    }

    public String getAccountNumber() {
        return accountNumber;
    }

    public double getBalance() {
        return balance;
    }

    public void deposit(double amount) {
        balance += amount;
    }

    public void withdraw(double amount) {
        if (balance >= amount) {
            balance -= amount;
        } else {
            System.out.println("Insufficient balance!");
        }
    }

    public void displayBalance() {
        System.out.println("Account balance: " + balance);
    }
}

Bank.java:

import java.util.ArrayList;
import java.util.List;

public class Bank {
    private List<Account> accounts;

    public Bank() {
        accounts = new ArrayList<>();
    }

    public void addAccount(Account account) {
        accounts.add(account);
    }

    public void removeAccount(Account account) {
        accounts.remove(account);
    }

    public Account findAccountByName(String name) {
        for (Account account : accounts) {
            if (account.getName().equals(name)) {
                return account;
            }
        }
        return null;
    }

    public Account findAccountByNumber(String accountNumber) {
        for (Account account : accounts) {
            if (account.getAccountNumber().equals(accountNumber)) {
                return account;
            }
        }
        return null;
    }
}

UI.java:

import java.util.Scanner;

public class UI {
    private Bank bank;

    public UI(Bank bank) {
        this.bank = bank;
    }

    public void run() {
        Scanner scanner = new Scanner(System.in);
        System.out.println("Welcome to the bank!");

        while (true) {
            System.out.println("Enter account name or number (or 'exit' to quit):");
            String input = scanner.nextLine();

            if (input.equals("exit")) {
                break;
            }

            Account account;

            if (input.matches("\\d+")) {
                account = bank.findAccountByNumber(input);
            } else {
                account = bank.findAccountByName(input);
            }

            if (account == null) {
                System.out.println("Account not found!");
                continue;
            }

            while (true) {
                System.out.println("Enter 'd' for deposit, 'w' for withdraw, 'b' for balance (or 'back' to go back):");
                String action = scanner.nextLine();

                if (action.equals("back")) {
                    break;
                }

                switch (action) {
                    case "d":
                        System.out.println("Enter deposit amount:");
                        double depositAmount = Double.parseDouble(scanner.nextLine());
                        account.deposit(depositAmount);
                        System.out.println("Deposit successful!");
                        break;
                    case "w":
                        System.out.println("Enter withdraw amount:");
                        double withdrawAmount = Double.parseDouble(scanner.nextLine());
                        account.withdraw(withdrawAmount);
                        System.out.println("Withdrawal successful!");
                        break;
                    case "b":
                        account.displayBalance();
                        break;
                    default:
                        System.out.println("Invalid action!");
                }
            }
        }

        System.out.println("Goodbye!");
    }
}

Main.java:

public class Main {
    public static void main(String[] args) {
        Bank bank = new Bank();
        bank.addAccount(new Account("Alice", "12345", 1000));
        bank.addAccount(new Account("Bob", "67890", 500));

        UI ui = new UI(bank);
        ui.run();
    }
}

这个简单的实现只是一个基础版本，还有很多可以改进的地方。例如，可以添加密码验证、支持多种货币类型、添加账户余额利息计算等功能。