如何在java中使用每个所需帐户的用户输入将资金从一个帐户转移到另一个帐户，以及要转移的金额

public class Account {
    private String accountId;
    private double balance;

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

    public String getAccountId() {
        return accountId;
    }

    public void setAccountId(String accountId) {
        this.accountId = accountId;
    }

    public double getBalance() {
        return balance;
    }

    public void setBalance(double balance) {
        this.balance = balance;
    }
}

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 Account getAccountById(String accountId) {
        for (Account account : accounts) {
            if (account.getAccountId().equals(accountId)) {
                return account;
            }
        }
        return null;
    }

    public void transfer(String fromAccountId, String toAccountId, double amount) {
        Account fromAccount = getAccountById(fromAccountId);
        Account toAccount = getAccountById(toAccountId);

        if (fromAccount != null && toAccount != null) {
            if (fromAccount.getBalance() >= amount) {
                fromAccount.setBalance(fromAccount.getBalance() - amount);
                toAccount.setBalance(toAccount.getBalance() + amount);
                System.out.println("Transfer successful!");
            } else {
                System.out.println("Insufficient balance!");
            }
        } else {
            System.out.println("Invalid account ID!");
        }
    }
}

public class Main {
    public static void main(String[] args) {
        // 创建账户
        Account account1 = new Account("A001", 1000);
        Account account2 = new Account("A002", 2000);

        // 添加账户到银行
        Bank bank = new Bank();
        bank.addAccount(account1);
        bank.addAccount(account2);

        // 转账操作
        String fromAccountId = "A001";
        String toAccountId = "A002";
        double amount = 500;
        bank.transfer(fromAccountId, toAccountId, amount);
    }
}