用Java实现ATM银行系统

好的，下面是一个简单的ATM银行系统Java代码示例。这个示例实现了基本的ATM操作，包括查询余额、取款、存款等，你可以根据自己的需要进行修改和扩展。

import java.util.Scanner;

public class ATMSystem {

    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        BankAccount bankAccount = new BankAccount("123456", 1000);

        while (true) {
            System.out.println("请选择操作：");
            System.out.println("1、查询余额");
            System.out.println("2、取款");
            System.out.println("3、存款");
            System.out.println("4、退出");

            int choice = input.nextInt();
            switch (choice) {
                case 1:
                    System.out.println("当前余额为：" + bankAccount.getBalance());
                    break;
                case 2:
                    System.out.println("请输入取款金额：");
                    double withdrawAmount = input.nextDouble();
                    bankAccount.withdraw(withdrawAmount);
                    break;
                case 3:
                    System.out.println("请输入存款金额：");
                    double depositAmount = input.nextDouble();
                    bankAccount.deposit(depositAmount);
                    break;
                case 4:
                    System.out.println("感谢使用ATM系统，再见！");
                    System.exit(0);
                default:
                    System.out.println("无效选择，请重新输入！");
                    break;
            }
        }
    }
}

class BankAccount {
    private String accountNumber;
    private double balance;

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

    public double getBalance() {
        return balance;
    }

    public void withdraw(double amount) {
        if (amount <= balance) {
            balance -= amount;
            System.out.println("取款成功，当前余额为：" + balance);
        } else {
            System.out.println("余额不足，取款失败！");
        }
    }

    public void deposit(double amount) {
        balance += amount;
        System.out.println("存款成功，当前余额为：" + balance);
    }
}

这段代码实现了一个简单的ATM银行系统，包括了查询余额、取款、存款等基本操作。你可以根据自己的需要进行修改和扩展。