java银行存取款系统类

以下是一个简单的Java银行存取款系统类的实现，包括存款、取款、转账和余额查询等功能：

public class Bank {
    private String accountNumber; // 账号
    private String password; // 密码
    private double balance; // 余额

    // 构造函数
    public Bank(String accountNumber, String password, double balance) {
        this.accountNumber = accountNumber;
        this.password = password;
        this.balance = balance;
    }

    // 存款
    public void deposit(double amount) {
        balance += amount;
        System.out.println("成功存入 " + amount + " 元，当前余额为 " + balance + " 元。");
    }

    // 取款
    public void withdraw(double amount) {
        if (balance >= amount) {
            balance -= amount;
            System.out.println("成功取出 " + amount + " 元，当前余额为 " + balance + " 元。");
        } else {
            System.out.println("余额不足，无法取款。");
        }
    }

    // 转账
    public void transfer(Bank other, double amount) {
        if (balance >= amount) {
            balance -= amount;
            other.balance += amount;
            System.out.println("成功转出 " + amount + " 元，当前余额为 " + balance + " 元。");
        } else {
            System.out.println("余额不足，无法转账。");
        }
    }

    // 余额查询
    public void checkBalance() {
        System.out.println("当前余额为 " + balance + " 元。");
    }
}