转账功能java实现

在Java中实现转账功能，通常会涉及到银行账户、交易处理和权限控制等部分。这里提供一个简单的例子，展示如何使用面向对象的方式来设计转账过程：

// 定义一个账户抽象类 Account
public abstract class Account {
    private double balance;

    public Account(double initialBalance) {
        this.balance = initialBalance;
    }

    // 抽象的存款和取款方法
    public abstract void deposit(double amount);
    public abstract void withdraw(double amount);

    // 获取余额的方法
    public double getBalance() {
        return balance;
    }
}

// 子类CheckingAccount，代表支票账户
public class CheckingAccount extends Account {
    @Override
    public void deposit(double amount) {
        super.deposit(amount);
        System.out.println("存入金额：" + amount + "，当前余额：" + getBalance());
    }

    @Override
    public void withdraw(double amount) {
        if (amount <= getBalance()) {
            super.withdraw(amount);
            System.out.println("取款金额：" + amount + "，当前余额：" + getBalance());
        } else {
            System.out.println("取款金额超过余额!");
        }
    }
}

// 用户类，持有账户并进行操作
public class User {
    private Account account;

    public User(Account account) {
        this.account = account;
    }

    // 转账方法
    public void transfer(Account targetAccount, double amount) {
        if (amount > 0 && amount <= account.getBalance()) {
            account.withdraw(amount);
            targetAccount.deposit(amount);
            System.out.println("从" + account.getClass().getSimpleName() + "向" + targetAccount.getClass().getSimpleName() + "转账" + amount + "成功");
        } else {
            System.out.println("转账失败，金额不足或为负数");
        }
    }
}

// 主函数演示
public static void main(String[] args) {
    CheckingAccount fromAccount = new CheckingAccount(1000);
    CheckingAccount toAccount = new CheckingAccount(500);
    User user = new User(fromAccount);
    user.transfer(toAccount, 500);
}