Question

用java语言编写一个小型的银行系统代码

要求输入用户名和密码，输入正确后，可以对其个人账户进行操作，包括存款、取款、查询余额等功能 ，输入不正确会提示。

Answer 1

private int balance = 0;

private  String username = "A";
private  String password = "B";

public void bank() {
    Scanner scan = new Scanner(System.in);
    String  temp;

    while (true) {
        System.out.println("输入账号：");

        if (scan.hasNext()) {
            temp = scan.next();

            if (temp.equals(username)) {
                break;
            } else {
                System.out.println("输入错误");
            }
        }
    }

    while (true) {
        System.out.println("输入密码：");

        if (scan.hasNext()) {
            temp = scan.next();

            if (temp.equals(password)) {
                break;
            } else {
                System.out.println("输入错误");
            }
        }
    }

    System.out.println("登录成功");

    while (true) {
        System.out.println("输入操作：");

        if (scan.hasNext()) {
            temp = scan.next();

            switch (temp) {
                case "存款":
                    int x = 0;

                    while (true) {
                        System.out.println("输入存款金额：");

                        if (scan.hasNextInt()) {
                            x = scan.nextInt();

                            break;
                        } else {
                            System.out.println("输入错误");

                            scan.next();
                        }
                    }

                    balance += x;

                    break;
                case "取款":
                    int y = 0;

                    while (true) {
                        System.out.println("输入取款金额：");

                        if (scan.hasNextInt()) {
                            y = scan.nextInt();

                            if (balance < y) {
                                System.out.println("余额不足");

                                continue;
                            }

                            break;
                        } else {
                            System.out.println("输入错误");

                            scan.next();
                        }
                    }

                    balance -= y;

                    break;
                case "余额":
                    System.out.println("余额：" + balance);

                    break;
                case "终止":
                    System.exit(0);
                default:
                    System.out.println("未知操作");
            }
        }
    }

Answer 2

链接：http://pan.baidu.com/s/1kVHcYgv 密码：pzsh

Answer 3

这得写不少的的代码 你的悬赏太低了