循环Java switch语句

Question

我的系统是银行系统，我希望我的程序在用户与其中一个流程（提款，查看余额等）进行交互之后循环执行。

在用户得到结果之后，我想给一个机会继续另一个过程：

package smartcode.atm.h.w;

import java.util.Scanner;

public class SmartCodeATMHW {

    public static void main(String[] args) {
        int p;
        int y = 1234;
        int Amount = 500;
        int result;
        int info;
        int f;
        int g;

        Scanner in = new Scanner(System.in);

        for (int i = 0; i < 3; i++) {
            System.out.println("Please enter PIN Number ");
            p = in.nextInt();

            if (p == y) {
                System.out.println("You have entered correct PIN number \n\n*****************");

                profile pr = new profile();
                pr.setName("Prapashtica");
                System.out.println("Welcome mr." + pr.getName());

                //loop from here 
                boolean end = false;
                do{
                    System.out.println("\nPress 1 to View Bank Account");
                    System.out.println("Press 2 to Deposit money");
                    System.out.println("Press 3 to Withdraw money");
                    System.out.println("Press 4 to Cancle the Process \n\n********************");
                    info = in.nextInt();

                    switch (info) {
                        case 1:
                            System.out.println("You have  " + Amount + "$ available");
                            return;

                        case 2:
                            System.out.println("You have  " + Amount + "$ available");
                            System.out.println("Please enter the amount you wish to deposit");
                            f = in.nextInt();

                            result = Amount + f;
                            System.out.println("You have  " + result + "$ available");
                            break;
                        case 3:
                            for (int l = 0; l < 3; l++) {
                                System.out.println("You have  " + Amount + "  $ available");
                                System.out.println("Please eter the amount you wish to withdraw");
                                g = in.nextInt();
                                if (g > 500) {
                                    System.out.println("You cannot withdraw more than your current amount");
                                } else {
                                    System.out.println("You have succesfully withdrawed  " + g + " $");
                                    result = Amount - g;

                                    System.out.println("You now have  " + result + "  $ available");
                                }
                            }
                            System.out.println("Your card is now blocked");
                            break;
                        case 4:
                            System.out.println("You have canceled the proccess");
                            break;
                        default:
                            System.out.println("Error \nInvalid number");
                            break;

                    }
                    return;
                }while (end == false);
            } else {
                System.out.println("You have entered incorrect PIN number  \nPlease try again  \n*******************************");
            }
        }
        System.out.println("Your card is now blocked");
    }
}

Answer 1

从代码中可以看到您已经使用end == false处理了需求。

您需要删除退货； 在切换大小写之后使用的语句。

另外，对于情况1，请使用break； 而不是返回；

public static void main(String[] args) {
    int p;
    int y = 1234;
    int Amount = 500;
    int result;
    int info;
    int f;
    int g;

    Scanner in = new Scanner(System.in);

    for (int i = 0; i < 3; i++) {
        System.out.println("Please enter PIN Number ");
        p = in.nextInt();

        if (p == y) {
            System.out.println("You have entered correct PIN number \n\n*****************");

            profile pr = new profile();
            pr.setName("Prapashtica");
            System.out.println("Welcome mr." + pr.getName());

            //loop from here 
            boolean end = false;
            do{
                System.out.println("\nPress 1 to View Bank Account");
                System.out.println("Press 2 to Deposit money");
                System.out.println("Press 3 to Withdraw money");
                System.out.println("Press 4 to Cancle the Process \n\n********************");
                info = in.nextInt();

                switch (info) {
                    case 1:
                        System.out.println("You have  " + Amount + "$ available");
                        break;

                    case 2:
                        System.out.println("You have  " + Amount + "$ available");
                        System.out.println("Please enter the amount you wish to deposit");
                        f = in.nextInt();

                        result = Amount + f;
                        System.out.println("You have  " + result + "$ available");
                        break;
                    case 3:
                        for (int l = 0; l < 3; l++) {
                            System.out.println("You have  " + Amount + "  $ available");
                            System.out.println("Please eter the amount you wish to withdraw");
                            g = in.nextInt();
                            if (g > 500) {
                                System.out.println("You cannot withdraw more than your current amount");
                            } else {
                                System.out.println("You have succesfully withdrawed  " + g + " $");
                                result = Amount - g;

                                System.out.println("You now have  " + result + "  $ available");
                            }
                        }
                        System.out.println("Your card is now blocked");
                        break;
                    case 4:
                        System.out.println("You have canceled the proccess");
                        break;
                    default:
                        System.out.println("Error \nInvalid number");
                        break;

                }

            }while (end == false);
        } else {
            System.out.println("You have entered incorrect PIN number  \nPlease try again  \n*******************************");
        }
    }
    System.out.println("Your card is now blocked");
}

您还可以从用户那里获取他是否要继续的输入，并根据响应再次显示选项。

Answer 2

这里：

for (int i = 0; i < 3; i++) {

在另一个循环中：

} while (end == false)

简直是假的。

您想要一个围绕您的“菜单”的循环； 当用户想要结束时，该循环结束。

故事结局。

Answer 3

只需将所有案例置于无限循环中，然后当用户选择案例4时，则选择system.exit（0）; 将终止程序，否则将循环。

导入java.util.Scanner;

公开课测试{

public static void main(String [] args){
    int p;
    int y = 1234;
    int Amount = 500;
    int result;
    int info;
    int f;
    int g;

    Scanner in = new Scanner(System.in);

    for (int i = 0; i < 3; i++) {
        System.out.println("Please enter PIN Number ");
        p = in.nextInt();

        if (p == y) {
            System.out.println("You have entered correct PIN number \n\n*****************");

            profile pr = new profile();
            pr.setName("Prapashtica");
            System.out.println("Welcome mr." + pr.getName());

            //loop from here 
            boolean end = false;
            while(true){
                System.out.println("\nPress 1 to View Bank Account");
                System.out.println("Press 2 to Deposit money");
                System.out.println("Press 3 to Withdraw money");
                System.out.println("Press 4 to Cancle the Process \n\n********************");
                info = in.nextInt();

                switch (info) {
                    case 1:
                        System.out.println("You have  " + Amount + "$ available");
                        return;

                    case 2:
                        System.out.println("You have  " + Amount + "$ available");
                        System.out.println("Please enter the amount you wish to deposit");
                        f = in.nextInt();

                        result = Amount + f;
                        System.out.println("You have  " + result + "$ available");
                        break;
                    case 3:
                        for (int l = 0; l < 3; l++) {
                            System.out.println("You have  " + Amount + "  $ available");
                            System.out.println("Please eter the amount you wish to withdraw");
                            g = in.nextInt();
                            if (g > 500) {
                                System.out.println("You cannot withdraw more than your current amount");
                            } else {
                                System.out.println("You have succesfully withdrawed  " + g + " $");
                                result = Amount - g;

                                System.out.println("You now have  " + result + "  $ available");
                            }
                        }
                        System.out.println("Your card is now blocked");
                        break;
                    case 4:
                        System.out.println("You have canceled the proccess");
                        System.exit(0);
                        break;
                    default:
                        System.out.println("Error \nInvalid number");
                        break;

                }

            }
        } else {
            System.out.println("You have entered incorrect PIN number  \nPlease try again  \n*******************************");
        }
    }
    System.out.println("Your card is now blocked");


}

}