java银行存款取款

以下是一个简化版的Java银行存款取款系统的代码示例：

import java.util.Scanner;

public class BankSystem {
    private static double balance = 0; // 初始余额为0

    public static void main(String[] args) {
        login(); // 登录验证
        menu(); // 显示菜单
    }

    // 登录验证
    public static void login() {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入账户名：");
        String username = scanner.nextLine();
        System.out.println("请输入密码：");
        String password = scanner.nextLine();
        // 这里可以添加账户密码验证的逻辑
    }

    // 显示菜单
    public static void menu() {
        Scanner scanner = new Scanner(System.in);
        int choice;
        do {
            System.out.println("请选择操作：");
            System.out.println("1. 查看余额");
            System.out.println("2. 存款");
            System.out.println("3. 取款");
            System.out.println("4. 退出");
            choice = scanner.nextInt();
            switch (choice) {
                case 1:
                    checkBalance();
                    break;
                case 2:
                    deposit();
                    break;
                case 3:
                    withdraw();
                    break;
                case 4:
                    System.out.println("谢谢使用！");
                    break;
                default:
                    System.out.println("无效的选择，请重新输入！");
                    break;
            }
        } while (choice ! 4);
    }

    // 查看余额
    public static void checkBalance() {
        System.out.println("当前余额为：" + balance);
    }

    // 存款
    public static void deposit() {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入存款金额：");
        double amount = scanner.nextDouble();
        balance += amount;
        System.out.println("存款成功！");
    }

    // 取款
    public static void withdraw() {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入取款金额：");
        double amount = scanner.nextDouble();
        if (amount > balance) {
            System.out.println("余额不足！");
        } else {
            balance -= amount;
            System.out.println("取款成功！");
        }
    }
}